Posterior Thigh

Question 1

list muscles of posterior thigh

Answer 1

• Semimembranosus
• Semitendinosus
• Biceps femoris (long head + short head)

Question 2

associated nerves of the sacral plexus

Answer 2

• anterior rami (L4-L5 and S1-S4)
• sciatic nerve (muscles of gluteal region - posterior thigh, leg, foot)

Question 3

what does the sciatic nerve innervate

Answer 3

• posterior thigh
• leg

Question 4

branches of sciatic nerve

Answer 4

• tibial nerve
• common fibular nerve (superficial branch and deep branch of common fibular)

Question 5

innervation of posterior compartment of leg

Answer 5

tibial

Question 6

innervation of lateral compartment of leg

Answer 6

superficial branch of common fibular nerve

Question 7

innervation of anterior compartment of leg

Answer 7

Deep branch of common fibular branch

Question 8

innervation of posterior compartment of thigh

Answer 8

sciatic and tibial nerve

Question 9

actions of muscles in posterior thigh

Answer 9

• extension of femur at hip joint
• flexion of leg at knee joint
• rotation of leg at knee

Question 10

general points of attachment for posterior thigh muscles

Answer 10

• ischial tuberosity
• medial tibia
• lateral fibula
• linea aspera of femur

Question 11

origin and insertion of semimembranosus

Answer 11

origin –> ischial tuberosity
insertion –> medial condyle of tibia

Question 12

origin and insertion of semitendinosus

Answer 12

origin –> ischial tuberosity
insertion –> tibia: superior part of medial surface

Question 13

action of semimembranosus and semitendinosus

Answer 13

extension of thigh at hip
flexion at knee
medial rotation of leg

Question 14

innervation of semmimembranosus and semitendinosus

Answer 14

sciatic nerve –> tibial division

Question 15

origin and insertion of biceps femoris (long head)

Answer 15

origin –> ischial tuberosity
insertion –> head of fibula

Question 16

origin and insertion of biceps femoris (short head)

Answer 16

origin –> lateral lip of linea aspera of femur
insertion –> head of fibula

Question 17

action of biceps femoris

Answer 17

• extension of thigh at hip (Long head)
• flexion of knee
• lateral rotation of leg

Question 18

innervation of biceps femoris

Answer 18

short head –> sciatic nerve (tibial division)
Long head –> sciatic nerve (fibular division)

Question 19

muscle(s) that arise from ischial tuberosity

Answer 19

• long head of biceps femoris
• semimembranosus
• semitendinosus

Question 20

muscle(s) inserting on tibia

Answer 20

• semimembranosus
• semitendinosis

Question 21

muscle(s) inserting on fibula

Answer 21

biceps femoris –> long and short head