Relationships Between the Posterior Interosseous Nerve and the Supinator Muscle: Application to Peripheral Nerve Compression Syndromes and Nerve Transfer Procedures
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Median Nerve Compression at Pronator Teres
1 Median Nerve Compression at Pronator Teres Surgical Indications and Considerations Anatomical Considerations: The median nerve and brachial artery travel together down the arm. Therefore, one must be very careful not to interfere with either the median nerve or the brachial artery, especially when conducting surgical procedures. In the area of the pronator teres, there are many tendons as well. It is important to identify, as much as possible, the correct site of compression. Pathogenesis: The median nerve can get entrapped or compressed by several structures in the arm. The pronator teres muscle is the most common. Others entrapment sites include the flexor digitorum superficialis arch, the lacertus fibrosis (bicipital aponeurosis), and ligament of Struthers (frequency occurs in that order). For compression of the median nerve at the pronator teres and flexor digitorum superficialis, the cause is almost always due to hypertrophy of the respected muscle. This hypertrophy is from quick, forceful and repeated movements to the involved muscle. Examples include a carpenter or a baseball batter. As the muscle hypertrophies, the signal from the median nerve is diminished resulting in paresthesias in the median nerve distribution (lateral arm and hand) distal to the site of compression. Pain in the volar part of the forearm, often aggravated by repetitive supination and pronation, is a common symptom of pronator involvement. Another indicator is forearm pain with the compression of muscle such as pain in the volar part of the forearm implicating pronator teres. Onset is typically insidious and diagnosis is usually delayed 9 months to 2 years. Epidemiology: Pronator teres syndrome is the second most common cause of median nerve compression behind carpal tunnel syndrome. -
Anatomical Study of the Brachial Plexus in Human Fetuses and Its Relation with Neonatal Upper Limb Paralysis
ORIGINAL ARTICLE Anatomical study of the brachial plexus Official Publication of the Instituto Israelita de Ensino e Pesquisa Albert Einstein in human fetuses and its relation with neonatal upper limb paralysis ISSN: 1679-4508 | e-ISSN: 2317-6385 Estudo anatômico do plexo braquial de fetos humanos e sua relação com paralisias neonatais do membro superior Marcelo Rodrigues da Cunha1, Amanda Aparecida Magnusson Dias1, Jacqueline Mendes de Brito2, Cristiane da Silva Cruz1, Samantha Ketelyn Silva1 1 Faculdade de Medicina de Jundiaí, Jundiaí, SP, Brazil. 2 Centro Universitário Padre Anchieta, Jundiaí, SP, Brazil. DOI: 10.31744/einstein_journal/2020AO5051 ❚ ABSTRACT Objective: To study the anatomy of the brachial plexus in fetuses and to evaluate differences in morphology during evolution, or to find anatomical situations that can be identified as the cause of obstetric paralysis. Methods: Nine fetuses (12 to 30 weeks of gestation) stored in formalin were used. The supraclavicular and infraclavicular parts of the brachial plexus were dissected. Results: In its early course, the brachial plexus had a cord-like shape when it passed through the scalene hiatus. Origin of the phrenic nerve in the brachial plexus was observed in only one fetus. In the deep infraclavicular and retropectoralis minor spaces, the nerve fibers of the brachial plexus were distributed in the axilla and medial bicipital groove, where they formed the nerve endings. Conclusion: The brachial plexus of human fetuses presents variations and relations with anatomical structures that must be considered during clinical and surgical procedures for neonatal paralysis of the upper limbs. How to cite this article: Cunha MR, Dias AA, Brito JM, Cruz CS, Silva Keywords: Brachial plexus/anatomy & histology; Fetus/abnormalities; Paralysis SK. -
Anatomic Variations in Relation to the Origin of the Musculocutaneous Nerve: Absence and Non-Perforation of the Coracobrachialis Muscle
Int. J. Morphol., 36(2):425-429, 2018. Anatomic Variations in Relation to the Origin of the Musculocutaneous Nerve: Absence and Non-Perforation of the Coracobrachialis Muscle. Anatomical Study and Clinical Significance Variaciones Anatómicas en Relación al Origen del Nervio Musculocutáneo: Ausencia y no Perforación del Músculo Coracobraquial: Estudio Anatómico y Significado Clínico Daniel Raúl Ballesteros Larrotta1; Pedro Luis Forero Porras2 & Luis Ernesto Ballesteros Acuña1 BALLESTEROS, D. R.; FORERO, P. L. & BALLESTEROS, L. E. Anatomic variations in relation to the origin of the musculocutaneous nerve: Absence and non-perforation of the coracobrachialis muscle. Anatomical study and clinical significance. Int. J. Morphol., 36(2):425- 429, 2018. SUMMARY: The most frequent anatomic variations of the musculocutaneous nerve could be divided in two main groups: communicating branches with the median nerve and variations in relation to the origin, which in turn can be subdivided into absence of the nerve and non-perforation of the coracobrachialis muscle. Unusual clinical symptoms and/or unusual physical examination in patients with motor disorders, could be explained by anatomic variations of the musculocutaneous nerve. A total of 106 arms were evaluated, corresponding to 53 fresh male cadavers who were undergoing necropsy. The presence or absence of the musculocutaneous nerve was evaluated and whether it pierced the coracobrachialis muscle or not. The lengths of the motor branches and the distances from its origins to the coracoid process were measured. In 10 cases (9.5 %) an unusual origin pattern was observed, of which six (5.7 %) correspond to non-perforation of the coracobrachialis muscle and four (3.8 %) correspond to absence of the nerve. -
The Branching and Innervation Pattern of the Radial Nerve in the Forearm: Clarifying the Literature and Understanding Variations and Their Clinical Implications
diagnostics Article The Branching and Innervation Pattern of the Radial Nerve in the Forearm: Clarifying the Literature and Understanding Variations and Their Clinical Implications F. Kip Sawyer 1,2,* , Joshua J. Stefanik 3 and Rebecca S. Lufler 1 1 Department of Medical Education, Tufts University School of Medicine, Boston, MA 02111, USA; rebecca.lufl[email protected] 2 Department of Anesthesiology, Stanford University School of Medicine, Stanford, CA 94305, USA 3 Department of Physical Therapy, Movement and Rehabilitation Science, Bouve College of Health Sciences, Northeastern University, Boston, MA 02115, USA; [email protected] * Correspondence: [email protected] Received: 20 May 2020; Accepted: 29 May 2020; Published: 2 June 2020 Abstract: Background: This study attempted to clarify the innervation pattern of the muscles of the distal arm and posterior forearm through cadaveric dissection. Methods: Thirty-five cadavers were dissected to expose the radial nerve in the forearm. Each muscular branch of the nerve was identified and their length and distance along the nerve were recorded. These values were used to determine the typical branching and motor entry orders. Results: The typical branching order was brachialis, brachioradialis, extensor carpi radialis longus, extensor carpi radialis brevis, supinator, extensor digitorum, extensor carpi ulnaris, abductor pollicis longus, extensor digiti minimi, extensor pollicis brevis, extensor pollicis longus and extensor indicis. Notably, the radial nerve often innervated brachialis (60%), and its superficial branch often innervated extensor carpi radialis brevis (25.7%). Conclusions: The radial nerve exhibits significant variability in the posterior forearm. However, there is enough consistency to identify an archetypal pattern and order of innervation. These findings may also need to be considered when planning surgical approaches to the distal arm, elbow and proximal forearm to prevent an undue loss of motor function. -
Early Passive Motion After Surgery
www.western -ortho.com www.denvershoulder.com Early Passive Motion after Shoulder Surgery Passive motion involves someone else moving the affected arm through the motion described. Or, in the case of elbow flexion/extension, you can use your opposite (non-affected arm) to move through the motion. Do 5 repetitions of each stretch 3 times per day. When you feel a slight ‘tightness’ with your arm in the position diagrammed, hold that position for 30 seconds. If lying down is difficult, the stretches can be done while seated. Shoulder Flexion Support arm at the wrist and elbow. With the thumb pointed forward, gently bring the arm up and forward then back to the side. Shoulder Abduction Support arm at wrist and elbow. With the thumb pointed away from the body and palm up, gently bring the arm out to the side. www.western -ortho.com www.denvershoulder.com Shoulder Internal/External Rotation Support arm at wrist and elbow. With the elbow at the side and bent to a 90 degree angle, gently rotate the hand away from the body down toward the table the individual is lying on. Elbow Flexion/Extension Forearm Pronation/Supination Grasp the wrist of your affected arm with your unaffected With your elbow and forearm supported on a table, hand. With your affected elbow against your side and your gently turn forearm so your palm is down, then turn palm up, gently bend and straighten your elbow. forearm so your palm is up. This can be done actively (without assistance from your other hand). . -
Pronator Syndrome: Clinical and Electrophysiological Features in Seven Cases
J Neurol Neurosurg Psychiatry: first published as 10.1136/jnnp.39.5.461 on 1 May 1976. Downloaded from Journal ofNeurology, Neurosurgery, and Psychiatry, 1976, 39, 461-464 Pronator syndrome: clinical and electrophysiological features in seven cases HAROLD H. MORRIS AND BRUCE H. PETERS From the Department ofNeurology, University of Texas Medical Branch, Galveston, Texas, USA SYNOPSIS The clinical and electrophysiological picture of seven patients with the pronator syndrome is contrasted with other causes ofmedian nerve neuropathy. In general, these patients have tenderness over the pronator teres and weakness of flexor pollicis longus as well as abductor pollicis brevis. Conduction velocity of the median nerve in the proximal forearm is usually slow but the distal latency and sensory nerve action potential at the wrist are normal. Injection of corticosteroids into the pronator teres has produced relief of symptoms in a majority of patients. Protected by copyright. In the majority of isolated median nerve dys- period 101 cases of the carpal tunnel syndrome functions the carpal tunnel syndrome is appropri- and the seven cases of the pronator syndrome ately first suspected. The median nerve can also reported here were identified. Median nerve be entrapped in the forearm giving rise to a conduction velocity determinations were made on similar picture and an erroneous diagnosis. all of these patients. The purpose of this report is to draw full attention to the pronator syndrome and to the REPORT OF CASES features which allow it to be distinguished from Table 1 provides clinical details of seven cases of the median nerve entrapment at other sites. -
Anatomical, Clinical, and Electrodiagnostic Features of Radial Neuropathies
Anatomical, Clinical, and Electrodiagnostic Features of Radial Neuropathies a, b Leo H. Wang, MD, PhD *, Michael D. Weiss, MD KEYWORDS Radial Posterior interosseous Neuropathy Electrodiagnostic study KEY POINTS The radial nerve subserves the extensor compartment of the arm. Radial nerve lesions are common because of the length and winding course of the nerve. The radial nerve is in direct contact with bone at the midpoint and distal third of the humerus, and therefore most vulnerable to compression or contusion from fractures. Electrodiagnostic studies are useful to localize and characterize the injury as axonal or demyelinating. Radial neuropathies at the midhumeral shaft tend to have good prognosis. INTRODUCTION The radial nerve is the principal nerve in the upper extremity that subserves the extensor compartments of the arm. It has a long and winding course rendering it vulnerable to injury. Radial neuropathies are commonly a consequence of acute trau- matic injury and only rarely caused by entrapment in the absence of such an injury. This article reviews the anatomy of the radial nerve, common sites of injury and their presentation, and the electrodiagnostic approach to localizing the lesion. ANATOMY OF THE RADIAL NERVE Course of the Radial Nerve The radial nerve subserves the extensors of the arms and fingers and the sensory nerves of the extensor surface of the arm.1–3 Because it serves the sensory and motor Disclosures: Dr Wang has no relevant disclosures. Dr Weiss is a consultant for CSL-Behring and a speaker for Grifols Inc. and Walgreens. He has research support from the Northeast ALS Consortium and ALS Therapy Alliance. -
Unusual Cubital Fossa Anatomy – Case Report
Anatomy Journal of Africa 2 (1): 80-83 (2013) Case Report UNUSUAL CUBITAL FOSSA ANATOMY – CASE REPORT Surekha D Shetty, Satheesha Nayak B, Naveen Kumar, Anitha Guru. Correspondence: Dr. Satheesha Nayak B, Department of Anatomy, Melaka Manipal Medical College (Manipal Campus), Manipal University, Madhav Nagar, Manipal, Karnataka State, India. 576104 Email: [email protected] SUMMARY The median nerve is known to show variations in its origin, course, relations and distribution. But in almost all cases it passes through the cubital fossa. We saw a cubital fossa without a median nerve. The median nerve had a normal course in the upper part of front of the arm but in the distal third of the arm it passed in front of the medial epicondyle of humerus, surrounded by fleshy fibres of pronator teres muscle. Its course and distribution in the forearm was normal. In the same limb, the fleshy fibres of the brachialis muscle directly continued into the forearm as brachioradialis, there being no fibrous septum separating the two muscles from each other. The close relationship of the nerve to the epicondyle might make it vulnerable in the fractures of the epicondyle. The muscle fibres surrounding the nerve might pull up on the nerve and result in altered sensory-motor functions of the hand. Since the brachialis and brachioradialis are two muscles supplied by two different nerves, this continuity of the muscles might result in compression/entrapment of the radial nerve in it. Key words: Median nerve, cubital fossa, brachialis, brachioradialis, entrapment INTRODUCTION The median nerve is the main content of and broad tendon which is inserted into the cubital fossa along with brachial artery and ulnar tuberosity and to a rough surface on the biceps brachii tendon. -
M1 – Muscled Arm
M1 – Muscled Arm See diagram on next page 1. tendinous junction 38. brachial artery 2. dorsal interosseous muscles of hand 39. humerus 3. radial nerve 40. lateral epicondyle of humerus 4. radial artery 41. tendon of flexor carpi radialis muscle 5. extensor retinaculum 42. median nerve 6. abductor pollicis brevis muscle 43. flexor retinaculum 7. extensor carpi radialis brevis muscle 44. tendon of palmaris longus muscle 8. extensor carpi radialis longus muscle 45. common palmar digital nerves of 9. brachioradialis muscle median nerve 10. brachialis muscle 46. flexor pollicis brevis muscle 11. deltoid muscle 47. adductor pollicis muscle 12. supraspinatus muscle 48. lumbrical muscles of hand 13. scapular spine 49. tendon of flexor digitorium 14. trapezius muscle superficialis muscle 15. infraspinatus muscle 50. superficial transverse metacarpal 16. latissimus dorsi muscle ligament 17. teres major muscle 51. common palmar digital arteries 18. teres minor muscle 52. digital synovial sheath 19. triangular space 53. tendon of flexor digitorum profundus 20. long head of triceps brachii muscle muscle 21. lateral head of triceps brachii muscle 54. annular part of fibrous tendon 22. tendon of triceps brachii muscle sheaths 23. ulnar nerve 55. proper palmar digital nerves of ulnar 24. anconeus muscle nerve 25. medial epicondyle of humerus 56. cruciform part of fibrous tendon 26. olecranon process of ulna sheaths 27. flexor carpi ulnaris muscle 57. superficial palmar arch 28. extensor digitorum muscle of hand 58. abductor digiti minimi muscle of hand 29. extensor carpi ulnaris muscle 59. opponens digiti minimi muscle of 30. tendon of extensor digitorium muscle hand of hand 60. superficial branch of ulnar nerve 31. -
Variations in the Branching Pattern of the Radial Nerve Branches to Triceps Brachii
Review Article Clinician’s corner Images in Medicine Experimental Research Case Report Miscellaneous Letter to Editor DOI: 10.7860/JCDR/2019/39912.12533 Original Article Postgraduate Education Variations in the Branching Pattern Case Series of the Radial Nerve Branches to Anatomy Section Triceps Brachii Muscle Short Communication MYTHRAEYEE PRASAD1, BINA ISAAC2 ABSTRACT Results: The branching patterns seen were types A 1 (3.6%), Introduction: The axillary nerve arises from the posterior cord B1 (1st pattern) 1 (3.6%), B2 (2nd pattern) 1 (3.6%), and C3 of the brachial plexus and supplies the deltoid and teres minor 22 (78.6%). Two new patterns observed were: type B2 muscles. Axillary nerve injuries lead to abduction and external (6th pattern) 1 (3.6%) and type D (2nd pattern) 2 (7.1%). The long rotation weakness. In such cases, branches to the heads of head had single innervation in 89.3% cases and the lateral and triceps brachii muscle have been transferred to the axillary nerve medial heads had dual innervation in 10.7% and 7.1% cases to establish reinnervation of the deltoid muscle. In addition, the respectively. triceps nerve branches can be nerve recipients to reinstitute Conclusion: The knowledge of the different branching patterns elbow extension. that are present will help surgeons to identify the most suitable Aim: To study the different branching patterns of the radial radial nerve branch to triceps brachii that can be used for nerve nerve branches to triceps brachii muscle. transfer to restore the motor function of the deltoid muscle or to reanimate the triceps brachii muscle. -
Some Variations in the Formation of the Brachial Plexus in Infants*
Tr. J. of Medical Sciences 29 (1999) 573–577 © TÜBİTAK Ahmet UZUN1 Some Variations in the Formation of the Brachial Sait BİLGİÇ2 Plexus in Infants* Received: June 23.1998 Abstract: The anatomical variations of the directly from a branch of the anterior brachial plexus in human have clinical division of the middle trunk (Fig.3,A). Group significance to surgeons, radiologists and 2 had three anterior division cords: a) the anatomists. We studied some variations in lateral cord formed from anterior division the formation of 130 brachial plexuses in of the upper trunk (Fig.2, A); b) an sixty-five infant cadavers (34 males, 31 “intermediate” cord formed from the females; aged 1-7 days). The brachial plexus anterior division of the middle trunk and c) consisted of the 5th, 6th, 7th, and 8th cervical the medial cord formed from the anterior spinal nerves and 1st thoracic spinal nerve division of the lower trunk (3.07%). In (69.23%). We found that among the 130 group 3, there was a rare variation of the plexuses, 30.77% also received a medial cord (1.54%) which receives an contribution from C4 (Fig.1, A ) . The anastomotic branch from the posterior variations in the formation of brachial division of the middle trunk (Fig.4, B). The 1Department of Anatomy, Inonu University, plexuses were classified into three groups. anomalies of the human brachial plexus have School of Medicine, 44100 Malatya-Turkey Group 1 had a variation in the formation of clinical importence in diagnosis of injuries of 2Department of Anatomy, Ondokuz Mayis the median nerve (10.77%), with fusion of the brachial plexus. -
High-Resolution 3T MR Neurography of the Brachial Plexus and Its Branches, with Emphasis on 3D Imaging
REVIEW ARTICLE High-Resolution 3T MR Neurography of the Brachial Plexus and Its Branches, with Emphasis on 3D Imaging A. Chhabra, G.K. Thawait, T. Soldatos, R.S. Thakkar, F. Del Grande, M. Chalian, and J.A. Carrino ABSTRACT SUMMARY: With advancement in 3D imaging, better fat-suppression techniques, and superior coil designs for MR imaging and the increasing availability and use of 3T magnets, the visualization of the complexity of the brachial plexus has become facile. The relevant imaging findings are described for normal and pathologic conditions of the brachial plexus. These radiologic findings are supported by clinical and/or EMG/surgical data, and corresponding high-resolution MR neurography images are illustrated. Because the brachial plexus can be affected by a plethora of pathologies, resulting in often serious and disabling complications, a better radiologic insight has great potential in aiding physicians in rendering superior services to patients. ABBREVIATIONS: EMG ϭ electromyography; MIP ϭ maximum intensity projection; MRN ϭ MR neurography; SPACE ϭ sampling perfection with application- optimized contrasts by using different flip angle; STIR ϭ short tau inversion recovery, TOS ϭ thoracic outlet syndrome he brachial plexus is a network of nerve confluences and ram- nerve (C5-C7) to the serratus anterior muscle arise directly from Tifications, which combine to form the large terminal branches the nerve roots.1,2,5 that supply motor and sensory branches to the upper extremities. The clinical differentiation of brachial plexopathy from other Trunks and Their Anatomic Relations spine-related abnormalities often poses a considerable diagnostic The C5 and C6 nerve roots compose the upper trunk, C7 contin- challenge, and electrodiagnostic tests are difficult to perform due ues as the middle trunk, and C8 and T1 compose the lower trunk.