Unit 5 - Lower Limb: Posterior Thigh Muscles (Ex. IV)

Question 1

short head of biceps femoris

Answer 1

O: L lip of linea aspera in middle 1/3 of femur
I: head of fibula
Inn: common fibular n. (L5-S2)
A: stabilizes pelvis in sagittal plane; flexion and external (L) rotation of knee

Question 2

semimembranosus

Answer 2

O: ischial tuberosity
I: M tibial condyle; oblique popliteal ligament; popliteus fascia
Inn: tibial n. (L5-S2)
A: extends hip and stabilizes pelvis in sagittal plane; flexion and internal (M) rotation of knee

Question 3

semitendinosus

Answer 3

O: ischial tuberosity and sacrotuberous ligament (common head w/ long head of biceps femoris)
I: M to tibial tuberosity in pes anserinus (along w/ tendons of gracilis and sartorius)
Inn: tibial n. (L5-S2)
A: extends hip and stabilizes pelvis in sagittal plane; flexion and internal (M) rotation of knee

Question 4

long head of biceps femoris

Answer 4

O: ischial tuberosity; sacrotuberous ligament (common head w/ semitendinosus)
I: head of fibula
Inn: tibial n. (L5-S2)
A: extends hip; stabilizes pelvis in sagittal plane; flexion and external (L) rotation of knee