O and I Quiz #3 - semitendinosus to psoas major

• Origin: Ischial tuberosity

• Insertion:

  1. Anteromedial aspect of superior tibia

  2. Contributes to pes anserinus

• Action:

  1. Hip extension

  2. Knee flexion

  3. Knee internal rotation (open chain)

• Innervation: Tibial

Muscle: Semitendinosus

O: Ischial tuberosity

Insertion:

Posterior medial aspect of the medial tibial condyle

A:

1. Hip extension
2. Knee flexion
3. Knee internal rotation (open chain)

Innervation: Tibial

Muscle: Semimembranosus

O:

long head: Ischial tuberosity and sacrotuberous ligament
Short head: Lateral lip of linea aspera

Insertion: Head of fibula

A:

1. Knee flexion
2. Hip extension, long head
3. Knee external rotation (open chain)

Innervation:

Long head: Tibial

Short head: Common fibular

Biceps femoris

• Origin: Iliac fossa

• Insertion: Lesser trochanter

• Action:

  1. Hip flexion

  2. Hip external rotation

• Innervation: Femoral

Muscle: Iliacus

• Origin: Bodies and transverse processes of T12-L5

• Insertion: Lesser trochanter

• Action:

• 1. Hip flexion
  2. Hip external rotation

• Innervation: Ventral rami L1-3

Muscle: Psoas major