Gluteal Region Flashcards
What forms the gluteal sulcus or crease?
Free border of gluteus maximus
What nerves supply the skin of the gluteal region?
Cluneal n. (Superior, middle, inferior)
What nerve innervates the skin of the medial glute region?
Middle cluneal n (lat cutaneous branches of d rami S1-S3)
What nerve innervates the inferior aspect of the glute region?
Inferior cluneal nn (branches of v rami S1-S3)
What nerve innervates the middle-superior aspect of the gluteal region?
Superior cluneal nn (lateral cutaneous branches of d rami L1-L4)
Superior gluteal vessels are located deep to the ____ muscle, and superficial to the _____ muscle
Gluteus medius
Gluteus minimus
Inferior gluteal vessels are located inferior to ____
Piriformis
Origin & insertion of gluteus maximus
O: outer surface of ilium and iliac crest; dorsal surface of sacrum; lateral aspect of coccyx & sacrotuberous ligament
I: iliotibial tract & gluteal tuberosity of femur
Innervation of gluteus maximus
Inferior gluteal n
Action of gluteus maximus
Extension & lateral rotation of thigh
Origin & insertion of gluteus medius
O: between anterior & posterior gluteal lines
I: lateral aspect of greater trochanter of femur
Innervation of gluteus medius
Superior gluteal n
Origin & insertion of gluteus minimus
O: between anterior & inferior gluteal lines
I: anterior aspect of greater trochanter & joint capsule of hips
Innervation of gluteus minimus
Superior gluteal n
Action of gluteus minimus & medius
Abduction & medial rotation
What is Trendelenburg sign?
Failure of Gluteus minimus & medius to pull the iliac blade toward their insertion at the greater trochanter, causing the opposite hip to drop during gait
if the left hip drops (lurch) while walking, name the side, nerve and muscles that may be paralyzed
- Lurch on left side = problem on right side
- Superior gluteal n
- gluteus medius & minimus
Origin & insertion of tensor fascia lata
O: ASIS & anterior iliac crest
I: iliotibial tract/band
Innervation of tensor fascia lata
Superior gluteal n
Action of tensor fascia lata
- Tenses the iliotibial tract, thereby stabilizing the thigh on the leg
- thigh abduction
Origin & insertion of piriformis
O: ventrolateral aspect of sacrum
I: greater trochanter
Innervation of piriformis
Nerve to piriformis
Origin & insertion of superior gemellus
O: outer surface of ischial spine
I: medial surface of greater trochanter
Innervation of superior gemellus
Nerve to obturator internus
Origin & insertion of obturator internus
O: inner surface of obturator membrane & obturator foramen
I: medial surface of greater trochanter
Innervation of obturator internus
Nerve to obturator internus
Origin & insertion of inferior gemellus
O: ischial tuberosity
I: medial surface of greater trochanter
Innervation of inferior gemellus
Nerve to quadratus femoris
Action of superior gemellus, obturator internus, inferior gemellus, and piriformis
- Laterally rotate extended thigh
- abduct flexed thigh
(Stabilization of hip joint)
Origin & insertion of quadratus femoris
O: lateral border of ischial tuberosity
I: quadrate tubercle & intertrochanteric crest
Innervation of quadratus femoris
Nerve to quadratus femoris
Action of quadratus femoris
Lateral rotation
(Stabilization of hip joint)
what are the PIN structures?
Pudendal n
Internal pudendal a + v
N to obturator internus
