5.2 Anatomy of the Muscular System Part 8

Question 1

What is the innervation of the piriformis?

Answer 1

spinal nerves L5-S2

Question 2

What are the muscles that are apart of the posterior hamstring group?

Answer 2

biceps femoris
semitendinosus
semimebranosus

Question 3

What is the origin and insertion of the biceps femoris?

Answer 3

origin = long head is ischial tuberosity and short head is the linea aspera of femur
insertion = lateral surface of the head of the fibula

Question 4

What is the action of the biceps femoris?

Answer 4

knee flexion and hip extension

Question 5

What is the innervation of the biceps femoris?

Answer 5

long head is tibial nerve and short head is common fibular nerve

Question 6

What is the origin and insertion of the semitendinosus?

Answer 6

origin = ischial tuberosity
insertion = medial surface of tibia

Question 7

What is the action of the semitendinosus?

Answer 7

knee flexion

Question 8

What is the innervation of the semitendinosus?

Answer 8

tibial nerve

Question 9

What is the origin and insertion of the semimembranosus?

Answer 9

origin = ischial tuberosity
insertion = medial condyle of tibia

Question 10

What is the action of the semimembranosus?

Answer 10

knee flexion

Question 11

What is the innervation of the semimembranosus?

Answer 11

tibial nerve

Question 12

What are the muscles of the anterior quadriceps?

Answer 12

rectus femoris
vastus medialis
vastus lateralis
vastus intermediate

Question 13

What is the origin and insertion of the rectus femoris?

Answer 13

origin = AIIS
insertion = common tendon of the quadriceps to tibial tuberosity

Question 14

What is the action of the rectus femoris?

Answer 14

knee extension and hip flexion

Question 15

What is the innervation of the rectus femoris?

Answer 15

femoral nerve

Question 16

What is the origin and insertion of the vastus medialis?

Answer 16

origin - intertrochanteric line of femur
insertion = patella via quadriceps tendon and tibial tuberosity

Question 17

What is the action of the vastus medialis?

Answer 17

knee extension

Question 18

What is the innervation of the vastus medialis?

Answer 18

femoral nerve

Question 19

What is the origin and insertion of the vastus lateralis?

Answer 19

origin = greater trochanter of femur
insertion = patella via quadriceps tendon and tibial tuberosity

Question 20

What is the action of the vastus lateralis?

Answer 20

knee extension