Hamstrings

Question 1

Give actions, origins, insertions and nerve innervation for biceps femoris

Answer 1

A
Flex the knee (tibiofemoral joint)
Laterally rotate the flexed knee (T/F joint)
Long head: Extend the hip (coxal joint)
Long head: Assist to laterally rotate the hip (coxal joint)
Tilt the pelvis posteriorly
O
Long head:Ischial tuberosity
Short head:Lateral lip of linea aspera
I
Head of the fibula
N
Long head:Sciatic (tibial branch) L5, S1, 2, 3 Short head:Sciatic (fibular branch) L5, S1, 2

Question 2

Give actions, origins, insertions and nerve innervation for semitendinosus

Answer 2

Semitendinosus
Flex the knee (tibiofemoral joint)
Medially rotate the flexed knee (T/F joint)
Extend the hip (coxal joint) Assist to medially rotate the hip (coxal joint)
Tilt the pelvis posteriorly
Ischial tuberosity
Proximal, medial shaft of the tibia at pes anserinus tendon
Sciatic (tibial branch) L4, 5, S1, 2

Question 3

Give actions, origins, insertions and nerve innervation for semimembranosus

Answer 3

A
Flex the knee (tibiofemoral joint)
Medially rotate the flexed knee (T/F joint)
Extend the hip (coxal joint)
Assist to medially rotate the hip (coxal joint)
Tilt the pelvis posteriorly
O
Ischial tuberosity
I
Posterior aspect of medial condyle of tibia
N
Sciatic (tibial branch) L4, 5, S1, 2