Lecture 14

THIGH MUSCLES

ANTERIOR and Medial COMPARTMENT

BY Dr Farooq Khan Aurakzai PMC Dated: 03.08.2021

INTRODUCTION

 What are the muscle compartments?  The limbs can be divided into segments.  If these segments are cut transversely, it is apparent that they are divided into multiple sections.

 These are called fascial compartments, and are formed by tough connective tissue septa.

 Compartments are groupings of muscles, nerves, and blood vessels in your arms and legs.

INTRODUCTION to the thigh Muscles

 The musculature of the thigh can be split into three sections by intermuscular septas in to;  Anterior compartment  Medial compartment and  Posterior compartment.  Each compartment has a distinct innervation and function. • The Anterior compartment muscle are the flexors of hip and extensors of knee. • The Medial compartment muscle are adductors of thigh. • The Posterior compartment muscle are extensor of hip and flexors of knee. Anterior Muscles of thigh

 The muscles in the anterior compartment of the thigh are innervated by the femoral nerve (L2-L4), and as a general rule, act to extend the leg at the knee joint. There are three major muscles in the anterior thigh –: • The pectineus, • Sartorius and • Quadriceps femoris.

 In addition to these, the end of the iliopsoas muscle passes into the anterior compartment.

ANTERIOR COMPARTMENT MUSCLE 1. SARTORIUS

 Is a long strap like and the most superficial muscle of the thigh descends obliquely  Is making one of the tendon of Pes anserinus .  In the upper 1/3 of the thigh the med margin of it makes the lat margin of Femoral triangle.  Origin:  Anterior superior iliac spine.  Insertion:  Anterior surface of Tibia just inferiolateral to its tuberosity.  Action:  Flexes the thigh at hip and leg at knee joint.  Innervation:  Femoral nerve (L2-L3) ANTERIOR COMPARTMENT MUSCLE Quadriceps Femoris

 The quadriceps femoris consists of four individual muscles; three vasti muscles and the rectus femoris.

 They form the main bulk of the thigh, and collectively are one of the most powerful muscle in the body.

 The muscles that form quadriceps femoris unite proximal to the knee, and distally attach to the patella via the patellar tendon.

 The patella attaches to the tibia by the patellar ligament.

 The quadriceps femoris is the main extensor of the knee. ANTERIOR COMPARTMENT MUSCLE Quadriceps Femoris MUSCLE Origin

 Rectus Femoris:  Ant. Sup. iliac spine and Ilium superior to acetabulum.  Vastus Lateralis:  Largest bulk of muscle  Greater trochanter and lateral lip of linea aspera of Femur.  Vastus Medialis:  Intertrochantric line and medial lip of linea aspera of Femur.  Vastus Intermedius:  Anterior and Lateral surface of shaft of Femur. ANTERIOR COMPARTMENT MUSCLE Quadriceps Femoris

Insertion:

 Rectus femoris:  Quadriceps Femoris tendon.

 Vastus Lateralis:  Q F T  Vastus Medialis:  Q F T and medial border of Patella  Vastus Intermedius:  Q F T and lateral margin of Patella ANTERIOR COMPARTMENT MUSCLE PSOAS MAJOR

 Origin:  Post abdominal wall, transverse processes of all lumbar vertebrae and disk between them.  Insertion:  Lesser trochanter of Femur .  Action:  Flexing thigh at hip joint and stabilizing the joint.  Innervation:  Ant rami of lumbar (L1-L2) Note: • It is the only muscle of the body which is present in three regions. i.e: Abdomen, pelvis and thigh. ANTERIOR COMPARTMENT MUSCLE ILIACUS

 Origin:  Interior of the ilium i.e: iliac fossa and ASIS.  Insertion:  Lesser trochanter of Femur.  Action:  Flexing the thigh at hip joint and stabilizing the hip joint.  Innervation:  Femoral nerve (L2-L3)

MEDIAL COMPARTMENT OF THIGH

 There are six muscles in this compartment  They comprise the adductor group.

 Consists of : 1:Adductor Longus 2:Adductor Brevis 3:Adductor Magnus 4:Gracilis 5:Obturator Externus 6:Pectineus MEDIAL COMPARTMENT OF THIGH

Adductor Longus  Origin:  Body of pubis inf to pubic crest  Insertion:  Middle 3rd of linea aspera  Action:  Adducts and medially rotates the thigh at hip joint  Innervation:  Obt nerve (L2,L3,L4) MEDIAL COMPARTMENT OF THIGH Adductor Brevis  Origin:  External surface of body of pubis and inf pubic ramus.

 Insertion:  Upper 1/3 of linea aspera and pectineal line.  Action:  Adducts the thigh and to some extent flexes it.  Innervation:  Obtuator nerve(L2-L3) MEDIAL COMPARTMENT OF THIGH ADDUCTOR MAGNUS Origin: Adductor part: Ischiopubic Ramus Hamstring part: Ischial tuberosity

Insertion: Adductor part: Gluteal tuberosity Hamstring part: Adductor tubercle

Action: Adduction and medial rotation. Innervation: Adductor-part: Obturator nerve(L2,L3,L4) Hamstring-part: Tibial division Sciatic nerve,L4 MEDIAL COMPARTMENT OF THIGH Gracilis

 Origin:  Body of inferior ramus of pubis.

 Insertion:  Medial surface of proximal shaft of Tibia.

 Action:  Adducts the thigh at hip joint and flexes the leg at knee joint

 Innervation:  Obutrator nerve(L2,L3) MEDIAL COMPARTMENT OF THIGH Obturator Externus

 Origin:  External surface of Obt membrane and adjacent bone  Insertion:  Trochanteric fossa  Action:  Laterally rotates the thigh and steadies head of femur in acetabulum  Innervation:  Obturator nerve (L3,L4) ANTERIOR COMPARTMENT MUSCLE Pectineus

• The pectineus muscle is a flat muscle that forms the base of the femoral triangle. • It has a dual innervation, and thus can be considered a transitional muscle between the anterior thigh and medial thigh compartments. • Attachments: • It originates from the pectineal line on the anterior surface of the pelvis, and • Attaches to the pectineal line on the posterior side of the femur, just inferior to the lesser trochanter.

• Actions: • Adduction and flexion at the hip joint.

• Innervation: • Femoral nerve. • May also receive a branch from the obturator nerve. fullsize\F66122-006-f041.jpg VESSELS OF THE THIGH

Femoral artery

• The femoral artery is a large artery in the thigh and the main arterial supply to the leg.

• It enters the thigh from behind the inguinal ligament as the common femoral artery, a continuation of the external iliac artery.

• Here, it lies midway between the anterior superior iliac spine and the symphysis pubis. Femoral artery……cont

• The common femoral artery gives off the profunda femoris artery and becomes the superficial femoral artery to descend along the anteromedial part of the thigh in the femoral triangle.

• It enters and passes through the adductor canal, and becomes the popliteal artery as it passes through an opening in adductor magnus near the junction of the middle and distal thirds of the thigh.

• Its first three or four centimetres are enclosed, with the femoral vein, in the femoral sheath. Femoral artery……Relations:

• The relations of the femoral artery are as follows:

• Anteriorly: • In the upper part of its course, it is superficial and is covered by skin and fascia. • In the lower part of its course, it passes behind the sartorius muscle.

• Posteriorly: • The artery lies on the psoas, which separates it from the hip joint, the pectineus, and the adductor longus. • The femoral vein intervenes between the artery and the adductor longus.

• Medially: • It is related to the femoral vein in the upper part of its course.

• Laterally: • The femoral nerve and its branches. Femoral artery……BRANCHES

The femoral artery gives off several branches in the thigh which include;

• The superficial circumflex iliac artery is a small branch that runs up to the region of the anterior superior iliac spine. • The superficial epigastric artery is a small branch that crosses the inguinal ligament and runs to the region of the umbilicus.

• The superficial external pudendal artery is a small branch that runs medially to supply the skin of the scrotum (or labium majus). • The deep external pudendal artery runs medially and supplies the skin of the scrotum (or labium majus). Femoral artery……BRANCHES:

• The profunda femoris artery is a large and important branch that arises from the lateral side of the femoral artery about 1.5 in. (4 cm) below the inguinal ligament.

• It passes medially behind the femoral vessels and enters the medial fascial compartment of the thigh.

• It ends by becoming the fourth perforating artery. • At its origin, it gives off the medial and lateral femoral circumflex arteries, and during its course it gives off three perforating arteries.

• The descending genicular artery is a small branch that arises from the femoral artery near its termination within the adductor canal. • It assists in supplying the knee joint.

• In clinical parlance, the part of the femoral artery proximal to the origin of profunda femoris is often termed the common femoral artery, while that distal to the origin of the profunda is termed the superficial femoral artery. Femoral vein

• The femoral vein is a blood vessel that accompanies the femoral artery in the femoral sheath.

• It begins at the adductor canal (also known as Hunter's canal) and is a continuation of the popliteal vein. • It ends at the inferior margin of the inguinal ligament, where it becomes the external iliac vein.

Drainage: • Several large veins drain into the Femoral vein: • Popliteal vein. • Profanda femoris vein. • Great saphenous vein.

OBTURATOR ARTERY

•The obturator artery is a branch of the internal iliac artery. • It passes antero-inferiorly (forwards and downwards) on the lateral wall of the pelvis, to the upper part of the obturator foramen, and, escaping from the pelvic cavity through the obturator canal.

• It divides into both an anterior and a posterior branch. • The anterior branch of the obturator artery is a small artery in the thigh.

• It distributes branches to the obturator externus, pectineus, adductors, and gracilis muscle. • It anastomoses with the posterior branch and with the medial femoral circumflex artery. OBTURATOR ARTERY…..con’t

• Posterior branch of the obturator artery gives twigs to the muscles attached to the ischial tuberosity and anastomoses with the inferior gluteal artery.

• It also supplies an articular branch which enters the hip-joint through the acetabular notch, ramifies in the fat at the bottom of the acetabulum and sends a twig along the ligament of head of femur (ligamentum teres) to the head of the femur. Clinical significance

• Occlusion of the femoral vein can be life- threatening.

• The practice of delivering recreational drugs intravenously using the femoral vein is relatively common amongst injecting drug users (IDUs). Thank You……