Muscles Of The Anterior Compartent Of The Thigh Flashcards Preview

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1

Muscles of the anterior compartment of the thigh

The three major muscles in the anterior thigh are the pectineus, sartorius and quadriceps femoris. In addition to these, the end of the iliopsoas muscle passes into the anterior compartment.

2

Innervation of muscles of the anterior compartment of the thigh

Femoral nerve (L2-L4)

3

General action of muscles of the anterior compartment of the thigh

Act to extend the leg at the knee joint

4

Iliopsoas

The iliopsoas is actually two muscles, the psoas major and the iliacus. They originate in different areas, but come together to form a tendon, hence why they are commonly referred to as one muscle.

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Iliopsoas Attachments

The psoas major originates from the lumbar vertebrae, and the iliacus originates from the iliac fossa of the pelvis. They insert together onto the lesser trochanter of the femur.

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Iliopsoas Actions

Flexes the thigh at the hip joint.

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Iliopsoas Innervation

The psoas major is innervated by anterior rami of L1-3, while the iliacus is innervated by the femoral nerve.

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What is the main extensor of the knee?

Quadriceps femoris

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Quadriceps femoris muscles

Vastus Lateralis, Vastus Intermedius, Vastus Medialis, Rectus Femoris

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Quadriceps femoris distal attachment

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

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What attaches the patella to the tibial ligament?

Patella ligament

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Vastus Lateralis Proximal attachment

Originates from the greater trochanter and the lateral lip of linea aspera.

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Vastus Lateralis Actions

Extends the knee joint and stabilises the patella.

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Vastus Lateralis Innervation

Femoral nerve.

15

Vastus Intermedius Proximal attachment

Anterior and lateral surfaces of the femoral shaft.

16

Vastus Intermedius Actions

Extends the knee joint and stabilises the patella.

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Vastus Intermedius Innervation

Femoral nerve.

18

Vastus Medialis Proximal attachment

The intertrochanteric line and medial lip of the linea aspera.

19

Vastus Medialis Actions

Extends the knee joint and stabilises the patella, particularly due to its horizontal fibres at the distal end.

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Vastus Medialis Innervation

Femoral nerve.

21

Rectus Femoris Proximal attachment

Originates from the ilium, just superior to the acetabulum.

22

Rectus Femoris Actions

The only muscle of the quadriceps to cross both the hip and knee joints. It flexes the thigh at the hip joint, and extends at the knee joint.

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Rectus Femoris Innervation

Femoral nerve.

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Sartorius Attachments

Originates from the anterior superior iliac spine, and attaches to the superior, medial surface of the tibia.

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Sartorius Actions

At the hip joint, it is a flexor, abductor and lateral rotator. At the knee joint, it is also a flexor.

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Sartorius Innervation

Femoral nerve.

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Pectineus 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.

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Pectineus Actions:

Adduction and flexion at the hip joint.

29

Pectineus Innervation

Femoral nerve. May also receive a branch from the obturator nerve.