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Home , Common peroneal nerve, Gluteus maximus, Gluteus medius, Gluteus minimus, Inferior gluteal nerve, Pudendal nerve

Color Code Important Gluteal Region and Back of Doctors Notes Notes/Extra explanation Editing File Objectives

 Know contents of gluteal region:  Groups of Glutei muscles and small muscles (Lateral Rotators).  & vessels.  Foramina and structures passing through them as: 1-Greater Sciatic . 2-Lesser Sciatic Foramen.  Back of thigh : muscles. Movements of the lower = Thigh =Leg = Flexion/Extension Flexion/Extension Flexion/Extension

Rotation

Adduction/Abduction

Inversion/Eversion Contents Of Gluteal Region: Muscles / Nerves / Vessels

1- Muscles: • Glutei: 1. . 2. . 3. . Abductors: • Group of small muscles (Lateral Rotators): 1. Gluteus medius. 2. Gluteus minimus. 1.Piriformis. Rotators: 2.Obturator internus 1. Obturator internus. 3.Superior gemellus 2. Quadratus femoris. 4.Inferior gemellus Extensor: 5.Quadratus femoris Gluteus maximus. Contents Of Gluteal Region: Muscles / Nerves / Vessels 2- Nerves (All from ): 1. Sciatic . 2. Superior gluteal nerve. 3. . 4. Post. cutaneous nerve of thigh. 5. Nerve to obturator internus. 6. Nerve to quadratus femoris. 7. . Contents Of Gluteal Region: Muscles / Nerves / Vessels

3- VESSELS: (all from internal iliac vessels):

1. Superior gluteal 2. Inferior gluteal 3. Internal pudendal vessels. Greater sciatic foreamen: Greater sciatic notch of hip is transformed into foramen by: sacrotuberous (between the to ) & sacrospinous (between the sacrum to ) Structures passing through Greater sciatic foramen :

Nerves: Vessels: Greater sciatic foramen Above 1. Superior gluteal nerves, 2. Superior gluteal piriformis vessels. Lesser sciatic foramen muscle.

3. .

Belew 4. Inferior gluteal nerves 10. Inferior gluteal piriformis 5. . vessels. muscle. 6. Posterior cutaneous nerve of 11. Internal pudendal thigh.(superficialis) vessels. 7. Nerve to quadratus femoris. 8. Nerve to obturator internus. 9. Pudendal Nerve . - Nerve to obturator internus. - pudendal nerve. -internal pudendal vessels. ( pass through both greater sciatic and lesser foramen) Lesser sciatic foramen: Lesser sciatic notch of is transformed into foramen by Sacrotuberous & sacrospinous ligaments.

Structures passing through Lesser sciatic foramen

Tendons Nerves Vessels

1. of obturator internus. 2. Nerve to obturator internus. 4. Internal pudendal vessels. 3. Pudendal nerve. Glutei Muscles Origins

Gluteus minimus: Anterior part of the gluteal surface of . Gluteus medius: Middle part of the gluteal surface of ilium. Gluteus maximus: o Posterior part of the gluteal surface of ilium. o Main origin: Back of sacrum & & back of . Glutei Muscles Insertions

Gluteus minimus: anterior surface of the Gluteus medius: lateral surface of the greater trochanter Gluteus maximus: Main insertion: 1. (iliotibial tract : thickening of the lateral part of deep of the thigh) Other insertion: 2. of the . Glutei Muscles Nerve Supply & Actions Continued...

Right pelvic tilt (the left side of the is elevated higher than the right side) as in picture. This requires a muscular effort by the hip abductors (glutei medii and minimi of opposite side) to pull the pelvis up. : is an abnormal gait that is usually found in people with weak abductor muscles of the hip which are supplied by the superior gluteal nerve

Helpful video for understanding https://www.youtube.com/watch?v=D kSTr7K-eAo Glutei Muscles (Summary) Muscle Origin Insertion Action Nerve Supply

Gluteus Anterior part of the anterior surface of 1. Abduction & 2. medial Superior gluteal minimus: gluteal surface of ilium the greater rotation of hip joint. nerve 3. prevent lateral tilt of trochanter the pelvis by contraction of ABDUCTORS on Gluteus Middle part of the lateral surface of opposite side, on raising medius: gluteal surface of the other limb from the greater ground. ilium, trochanter

Gluteus Posterior part of the 1.Main insertion: 1. Extension & 2. lateral Inferior gluteal maximus: gluteal surface of iliotibial tract rotation of the hip joint. nerve ilium, 3. Stabilizes the femur on 2.Other insertion: during standing Main origin: Back of gluteal tuberosity (Through its attachment sacrum & coccyx & of the femur. to iliotibial tract) back of Sacrotuberous ligament. Small Muscles (Lateral Rotators) important

See next slide for picture Small Muscles (Lateral Rotators) important Nerves

Name Course Branch

SUPERIOR Passes through GSF, above piriformis, then 1) Muscular to gluteus medius, minimus & GLUTEAL between gluteus medius & minimus. tensor fasciae lata. 2) Articular to hip joint.

INFERIOR Passes through GSF, below piriformis, then deep Muscular to gluteus maximus GLUTEAL to gluteus maximus.

NERVE TO Passes through GSF, below piriformis. 1) Muscular to quadratus femoris & inferior QUADRATUS gemellus FEMORIS 2) Articular to hip joint

POSTERIOR Passes through GSF, below piriformis, then Cutaneous branches to: gluteal region, back of CUTANEOUS descends deep to deep fascia. in males (labium majus in females) back of thigh & upper part of back of leg. NERVE TO THIGH

SCIATIC Passes through GSF, below piriformis, then • No branches in gluteal region. superficial to: ischial spine, superior gemellus, • Divides into tibial & common peroneal nerves, tendon of obturator internus, inferior gemellus, in the middle of back of thigh. quadratus femoris & adductor magnus.

Posterior Compartment Of The Thigh

Contents

Muscles supply Nerve supply

Hamstring muscles: Branches of Sciatic nerve. 1.Biceps femoris. the profunda 2.Semitendinosus. femoris . 3.Semimembranosus. 4.Ischial part of adductor magnus. Posterior Compartment Of The Thigh: Muscles 1. Biceps femoris 2. Semitendinosus Origin The long head from the ischial tuberosity. Origin Ischial tuberosity The short head from the . Insertion Upper part of the medial surface of the Insertion Mainly into the head of the . shaft of the tibia (SGS)* Nerve The long head is supplied by the tibial part of Nerve Supply sciatic; Supply Tibial portion of the sciatic. the short head is supplied by the common peroneal part of the sciatic. Action Flexes and medially rotates the leg at the knee joint Action Flexion of knee. Extends the thigh at the hip joint Lateral rotation of flexed leg. Long head (only): extends hip. Remember: *SGS (semitendinosus / gracialis / sartorius): Three muscles that have the same insertions.

Extra information: Lateral Medial Their join and form Posterior Compartment Of The Thigh: Muscles 4. Adductor Magnus 3. Semimembranosus (Hamsting part) Origin Ischial tuberosity Origin Ischial ramus and ischial tuberosity Insertion Posterior surface of the medial condyle of the tibia. It forms the oblique popliteal ligament, which Insertion Adductor tubercle of the medial condyle of the reinforces the capsule on the back of the knee joint. femur Nerve Nerve The tibial portion of the sciatic Supply Tibial portion of the sciatic. Supply Action Extends the thigh at the hip joint Action Flexes and medially rotates the leg at the knee joint Extends the thigh at the hip joint

Note: The adductor magnus has 2 parts: adductor part and hamstring part. The 2 parts have different origin, insertion, action and nerve supply. They are also in different compartments of the thigh Posterior Compartment Of The Thigh: Blood Supply

The four perforating branches of the profunda femoris artery (deep artery of thigh) provide a rich blood supply to this compartment.

The profunda femoris drains the greater part of the blood from the compartment. Posterior Compartment Of The Thigh: Nerve Supply Sciatic Nerve o The sciatic nerve, a branch of the sacral plexus (L4 and 5; S1, 2, and 3), leaves the gluteal region as it descends in the midline of the thigh. o It is overlapped posteriorly by the adjacent margins of the biceps femoris and semimembranosus muscles. o It lies on the posterior aspect of the adductor magnus. o In the lower third of the thigh it ends by dividing into the tibial and common peroneal nerves. Common fibular nerve = Summary of Posterior Compartment Muscle Origin Insertion Action Nerve Supply Biceps femoris The long head: Mainly into the head 1. Flexion of knee. The long head: the ischial of the fibula. 2. Lateral rotation tibial part of sciatic tuberosity. of flexed leg. the short head: the The short head: Long head (only): common peroneal the linea aspera . extends hip. part of the sciatic.

Semitendinosus Upper part of the medial surface of the shaft of the tibia 1.Flexes and (SGS)* 2.medially rotates the leg at the knee Ischial tuberosity joint Posterior surface of Semimembranosus 3. Extends the Tibial portion of the medial condyle thigh at the hip the sciatic of the tibia. (forms joint the oblique popliteal ligament) Adductor magnus Ischial ramus and Adductor tubercle of 1. Extends the (hamstrings part) ischial tuberosity the medial condyle thigh at the hip of the femur joint Summary of Posterior Compartment Actions

Action Muscles Semimembranosus Flexion of knee. Semitendinosus Biceps femoris

Semimembranosus Medially rotates the leg Semitendinosus

Lateral rotation of flexed leg. Biceps Femoris

Semimembranosus Semitendinosus Extends the thigh at the hip. Long head : biceps femoris Adductor magnus (hamstring part) Questions 5. The sciatic nerve most commonly divides into tibial & common 1. What is the structure that pass through greater and lesser foramen: peroneal nerves, in: A. Nerve to obturator internus. A. Gluteal region. B. pudendal nerve. B. The middle of back of lower third thigh. C. internal pudendal vessels. D. All of them C. The lateral of back of lower third thigh. D. Below Piriformis. 2. What ligaments form the greater and lesser foramen? 6. Name the branches of Posterior Cutaneous Nerve Of Thigh?

3. The main insertion of gluteus maximus is 7. Insertion of ADDUCTOR MAGNUS (HAMSTRING PART): A. iliotibial tract. A. Adductor tubercle of the medial condyle of the tibia. B. anterior part of the gluteal surface of ilium. B.Abductor tubercle of the medial condyle of the femur. C. lateral surface of the greater trochanter. C.Posterior surface of the medial condyle of the tibia. D. gluteal tuberosity. D.Adductor tubercle of the medial condyle of the femur. Answers: 1.D 4. Which one of the following is NOT one of the Hamstring muscles? 2.Sacrotuberous & sacrospinous A. Biceps femoris. 3.A B. Semitendinosus. 4.C 5.B C. Triceps femoris. 6.It has cutaneous branches to 1. gluteal region, 2. back of D. Semimembranosus. scrotum in males (labium majus in females) 3. back of thigh & 4. upper part of back of leg. 7. D Questions 10. How many branches does the sciatic nerve have in the gluteal regoin? 8.Sciatic nerve lies in the : A. 0 A.posterior aspect of the adductor magnus. B. 1 B.anterior aspect of the adductor magnus. C. 2 C.posterior aspect of the semimembranosus . D. 3 D.posterior aspect of the biceps femoris.

11. Which of the following forms the obliques popliteal ligament? 9. A patient presented to the ER with tilting of the pelvis when lifting one of the legs while walking (see picture). A. Biceps glutei a) What muscles are affected? B. Semitendinosus b) What nerve(s) is supplying them? c) The patient had a positive trandelenburg sign. What does C. Semimembrinosus this mean? D. Adductor magnus d) What is the name of this condidtion? Answers: 8. A 9. a) Gluteus Medius and Gluteus Minimus. b) Superior gluteal nerve. c) When lifting (opposite) leg the pelvis tilts down on the non- paralyzed opposite side, d) Gluteal gait. 10. A 11. C Leaders: Members: Nawaf AlKhudairy Dania Alkelabi Jawaher Abanumy Deena AlNowiser Ghada Almazrou Jawaher Alkhayyal Nourah Al Hogail Razan AlQahtani Safa Al-Osaimi

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