Muscles Of Thigh Anterior Compartment

Question 1

Name the muscles in this compartment

Answer 1

Pectineus
Sertorius
Quadriceps femoris
Iliopsoas (passes into anterior compartment)

Question 2

Innervation of this compartment

Answer 2

Femoral nerve

Question 3

What is the iliopsoas composed of? What is its innervation?

Answer 3

Psoas major (anterior rami L1-3) and the iliacus (femoral nerve)

Question 4

Iliopsoas

Answer 4

Flexes thigh at hip joint

Question 5

Sartorius

Answer 5

Flexor, abductor and lateral rotator of hip joint

Flexor of knee joint

Question 6

Pectineus

Answer 6

Addiction and flexion at hip joint

Question 9

Quadricep femoris muscles include…

Answer 9

Vastus lateralis
Vastus intermedius
Vastus medialis
Rectus femoris

Question 10

Vastus lateralis

Answer 10

Extends the knee joint and stabilises patella

Question 11

Vastus intermedius

Answer 11

Extends the knee joint and stabilises the patella

Question 12

Clinical relevance: testing quadriceps femoris

Answer 12

Can be used to test the femoral nerve in cases of suspected nerve palsy.
Patient supine with knee slightly flexed; patient is asked to extend the leg (at the knee) against resistance. If femoral nerve is damaged, contraction of the quadriceps femoris will be absent.

Question 13

Rectus femoris

Answer 13

Only muscle of the quadriceps to cross both the hip and knee joints.
Flexes thigh at the hip joint and extends at the knee joint

Question 14

Vastus medialis

Answer 14

Extends knee joint and stabilises patella

Horizontal fibres at distal end increases stabilisation of patella