gluteal and thigh exam 4

Question 1

where do gluteus maximus, minimus and medius originate?

Answer 1

gluteal surface of ala of ilium

Question 2

which gluteal muscle does not insert in greater trochanter of femur? where does it insert?

Answer 2

gluteus maximus. inserts in gluteal tuberosity of femur and iliotiobial band

Question 3

which gluteal muscle does the inferior gluteal nerve innervate?

Answer 3

g. maximus

Question 4

which gluteus muscles does the superior gluteal nerve innervate?

Answer 4

medius and minimus

Question 5

what is the action of gluteus maximus?

Answer 5

major extensor of the thigh (especially from sitting position)

Question 6

what is the action of the gluteus minimus and medius?

Answer 6

OKC: abducts and medially rotates the thigh
CKC: steadies pelvis during gait (prevents dipping to contralateral side)

Question 7

origin of piriformis

Answer 7

anterior surface of sacrum

Question 8

origin of obturator internus

Answer 8

internal surface of obturator membrane

Question 9

origin of gemellus inferior, gemellus superior and quadratus femoris?

Answer 9

body of ischium

Question 10

where does quadratus femoris insert?

Answer 10

intertrochanteric crest

Question 11

which muscles laterally rotate the thigh?

Answer 11

piriformis, obturator internus, gemelli, quadratus femoris

Question 12

what innervates the piriformis?

Answer 12

nerve to piriformis

Question 13

what inervates obturator internus?

Answer 13

nerve to obturator internus and gemellus superior

Question 14

what innervates gemellus inferior?

Answer 14

nerve to quadratus femoris and gemellus inferior

Question 15

from where do glutear arteries originate?

Answer 15

internal iliac artery

Question 16

cutaneous and muscular innervation of lower extremity is derived from?

Answer 16

lumbosacral plexus, ventral rami of all lumbar nerves, ventral rami of all sacral nerves, ventral ramus of the coccygeal nerve (Co1), and a communicating ramus from the ventral ramus of the twelfth thoracic nerve.

Question 17

what is lumbosacral plexus divided into?

Answer 17

lumbar, sacral, and coccygeal portion. lumbar and sacral innervate lower extemity, lower abdominal wall and most of perineum. coccygeal innervates the anococcygeal region.

Question 18

what portion of lumbosacral plexus innervates gluteal region?

Answer 18

lumbar portion (t12-L4)

Question 19

major branches that innervate gluteal region? 4

Answer 19

lateral femoral cutaneous nerve
femoral nerve
-medial femoral cutaneous nerve
-intermediate femoral cutaneous nerve
-saphenous nerve
-muscular branches
obturator nerve
-anterior and posterior branches
lumbosacral trunk

Question 20

sacral portion of lumbosacral plexus

Answer 20

(L4-S4)

Question 21

major branches of sacral portion

Answer 21

superior and inferior gluteal nerves
posterior femoral cutaneous nerve
sciatic nerve:
-"tibial nerve
--medial calcaneal nerve, medial plantar nerve, lateral plantar nerve
-common fibular nerve
--superficial
--deep
sural nerve

Question 22

what forms sural nerve?

Answer 22

tibial and common fibular nerves

Question 23

which dermatomes are involved in cutaneous innervation of gluteal region?

Answer 23

L2, L3, L4, L5, S1, S2, S3

Question 24

what cutaneous nerves are involved in innervation of gluteal region?

Answer 24

posterior rami forming superior and middle cluneal nerves

posterior femoral cutaneous nerve forming inferior cluneal nerves