Medial and Posterior Thigh

Question 1

Adductor Longus

Answer 1

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

Insertion: Linea aspera on middle one third of shaft of femur

Innervation: L2-L3-L4 Obturator nerve (ante- rior division)

Function: Adducts and medially rotates thigh at hip joint

Question 2

Adductor Magnus- Adductor Portion

Answer 2

Origin: Ischiopubic ramus

Insertion: Posterior surface of proximal femur, linea aspera, medial supracondylar line

Innervation: L2-L3-L4 Obturator nerve

Function: Adducts and medially rotates thigh at hip joint

Question 3

Adductor Magnus- Hamstring portion

Answer 3

Origin: Ischial tuberosity

Insertion: Adductor tubercle and supra- condylar line

Innervation: L4-S1 Sciatic nerve (tibial divi- sion)

Function: Adducts and medially rotates thigh at hip joint

Question 4

Semimembranosus

Answer 4

Origin: Superolateral im- pression on the ischial tuberosity

Insertion: Medial surface of proximal tibia

Innervation: L5-S1-S2 Sciatic nerve

Function: Flexes leg at knee joint and extends thigh at hip joint medially rotates thigh at hip joint and leg at knee joint

Question 5

Semitendinosus

Answer 5

Origin: Inferomedial part of the upper area of the ischial tuberosity

Insertion: Medial surface of proximal tibia

Innervation: L5-S1-S2 Sciatic nerve

Function: Flexes leg at knee joint and extends thigh at hip joint medially rotates thigh at hip joint and leg at knee joint

Question 6

Biceps Femoris- Long Head

Answer 6

Origin: Long Head
Flexes and laterally rotates leg at knee joint. Extends and laterally rotates the thigh at hip joint
Inferomedial part of the upper part of ischial tuberosity

Insertion: Head of fibula

Innervation: L5-S1-S2 Sciatic nerve (tibial)

Function: Flexes and laterally rotates leg at knee joint. Extends and laterally rotates the thigh at hip joint

Question 7

Biceps Femoris- Short Head

Answer 7

Origin: Lateral lip of linea aspera

Insertion: Head of fibula

Innervation: L5-S1-S2 Sciatic nerve (fibular)

Function: Flexes and laterally rotates leg at knee joint. Extends and laterally rotates the thigh at hip joint