Posterior Thigh Muscles O&I

Question 1

Biceps femoris origin

Answer 1

long head- ischial Tuberosity

short head& linea aspera of femur

Question 2

Biceps femoris insertion

Answer 2

head of the fibula, lateral aspect

Question 3

Biceps femoris innervation

Answer 3

long head- tibial nerve

short head- common fibularis nerve

Question 4

Biceps femoris action

Answer 4

flexion of knee
weak extension of hip
lateral rotation of tibia

Question 5

semitendinosus origin

Answer 5

ischial Tuberosity

Question 6

semitendinosus insertion

Answer 6

PES anserinus, posterior slip

Question 7

Semitendinosus innervation

Answer 7

tibial nerve

Question 8

semitendinosus action

Answer 8

flexion of knee, extension of hip, weak *medial rotation of tibia

Question 9

semimembranosus origin

Answer 9

ischial Tuberosity

Question 10

semimembranosus insertion

Answer 10

medial aspect of the tibial condyle

Question 11

semimembranosus innervation

Answer 11

tibial nerve

Question 12

semimembranosus action

Answer 12

flexion of knee, weak Extensor of hip, *medial rotation of tibia.

Question 13

The primary blood supply for the posterior compartment of the thigh is?

Answer 13

perforating arteries that branch from the deep femoral artery

Question 14

What muscle does the perforating arteries pierce to get the posterior compartment of the leg?

Answer 14

adductor Magnus