Muscles of the medial compartment of thigh

Question 1

Gracialis

Answer 1

Origin:

• A line on the external surfaces of the body of the pubis, the inferior pubic ramus and the ranks of the ischium

Insertion:

• Medial surface of proximal shaft of tibia

Innervation:

• Obturator nerve (L2, L3)

Function:

• Adducts thigh at hip joint and flexes leg at knee joint

Question 2

Pectineus

Answer 2

Origin:

• Pectineal line (pecten pubis) and adjacent bone of pelvis

Insertion:

• Oblique line extending from base of lesser trochanter to line aspera on posterior surface of proximal femur

Innervation:

• Femoral nerve (L2, L3)

Function:

• Adducts and flexes thigh at hip joint

Question 3

Adductor longus

Answer 3

Origin:

• External surface of body of pubis (triangular depression inferior to pubic crest and lateral to pubic symphysis)

Insertion:

• Linea aspera on middle one third of shaft of femur

Innervation:

• Obturator nerve (anterior division) (L2, L3, L4)

Function:

• Adducts and medially rotates thigh at hip joint

Question 4

Adductor brevis

Answer 4

Origin:

• External surface of body of pubis and inferior pubic ramus

Insertion:

• Posterior surface of proximal femur and upper one third of line aspera

Innervation:

• Obturator nerve (L2, L3)

Function:

• Adducts and medially rotates thigh at hip joint

Question 5

Adductor magnus

Answer 5

Origin - Adductor part:

• Ischiopubic rams

Insertion:

• Posterior surface of proximal femur, line aspera, medial supreacondylar line

Innervation:

• Obturator nerve (L2, L3, L4)

Function:

• Adducts and medially rotates thigh at hip joint

Origin - Hamstring part:

• Ischial tuberosity

Insertion:

• Adducts tubercle and supracondylar line

Innervation:

• Sciatic nerve (tibial division - (L2, L3, L4)

Function:

• Adducts and medially rotates thigh at hip joint

Question 6

Obturator externus

Answer 6

Origin:

• External surface of obturator membrane and adjacent bone

Insertion:

• Trochanteric fossa

Innervation:

• Obturator nerve (posterior division) (L3, L4)

Function:

• Laterally rotates thigh at hip joint