gluteal and thigh exam 4 Flashcards
where do gluteus maximus, minimus and medius originate?
gluteal surface of ala of ilium
which gluteal muscle does not insert in greater trochanter of femur? where does it insert?
gluteus maximus. inserts in gluteal tuberosity of femur and iliotiobial band
which gluteal muscle does the inferior gluteal nerve innervate?
g. maximus
which gluteus muscles does the superior gluteal nerve innervate?
medius and minimus
what is the action of gluteus maximus?
major extensor of the thigh (especially from sitting position)
what is the action of the gluteus minimus and medius?
OKC: abducts and medially rotates the thigh
CKC: steadies pelvis during gait (prevents dipping to contralateral side)
origin of piriformis
anterior surface of sacrum
origin of obturator internus
internal surface of obturator membrane
origin of gemellus inferior, gemellus superior and quadratus femoris?
body of ischium
where does quadratus femoris insert?
intertrochanteric crest
which muscles laterally rotate the thigh?
piriformis, obturator internus, gemelli, quadratus femoris
what innervates the piriformis?
nerve to piriformis
what inervates obturator internus?
nerve to obturator internus and gemellus superior
what innervates gemellus inferior?
nerve to quadratus femoris and gemellus inferior
from where do glutear arteries originate?
internal iliac artery
cutaneous and muscular innervation of lower extremity is derived from?
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.
what is lumbosacral plexus divided into?
lumbar, sacral, and coccygeal portion. lumbar and sacral innervate lower extemity, lower abdominal wall and most of perineum. coccygeal innervates the anococcygeal region.
what portion of lumbosacral plexus innervates gluteal region?
lumbar portion (t12-L4)
major branches that innervate gluteal region? 4
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
sacral portion of lumbosacral plexus
(L4-S4)
major branches of sacral portion
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
what forms sural nerve?
tibial and common fibular nerves
which dermatomes are involved in cutaneous innervation of gluteal region?
L2, L3, L4, L5, S1, S2, S3
what cutaneous nerves are involved in innervation of gluteal region?
posterior rami forming superior and middle cluneal nerves
posterior femoral cutaneous nerve forming inferior cluneal nerves
