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Lower Anatomy
Quiz 5
10
Anatomy
Professional
02/06/2008

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Term
Gluteus Maximus O, I, A, NS and AS
Definition
O: external iliac ala posterior to the posterior gluteal line, posterior iliac crest, ext. surfaces of sacrum and coccyx and sacrotuberous ligament
I: gluteal tuberosity of femur and posterosuperior iliotibial tract
A: extends and laterally rotates thigh
NS: inferior gluteal N.; dorsal divisions of ventral rami L-5, S-1, S-2
AS: sup. gluteal A, inf. gluteal A. and perforating branches of profunda femoris A
Term
3 bursae associated with gluteus maximus?
Definition
trocanteric. ischial and gluteofemoral bursa
Term
Gluteus Medius
Definition
O: external iliac ala intermediate to the anterior and posterior gluteal lines
I: lateral aspect of greater trochanter
A: abducts the thigh: aids withe both medial and lateral rotation of thigh
NS: sup. gluteal N; dorsal divisions of ventral rami L4, L5, S1
AS: superior gluteal A
Term
Gluteus Minimus
Definition
O: iliac ala intermediate to anterior and inferior gluteal lines and superior edge of the greater sciatic notch
I: anterior aspects of the greater trochanter and hip joint capsule
A: abduction and medial rotation of thigh
NS: superior gluteal N.
AS: superior gluteal A.
Term
Piriformis
Definition
O: pelvic surface of the sacrum
I: superior aspect of the greater trochanter
A: lateral rotation of thigh; assists in abduction and extension of thigh
NS: dorsal division of S-2 ventral rami (N. to piriformis)
AS: superior and inferior gluteal As
Term
Superior Gemellus
Definition
O: ischial spine and superior edge of lesser sciatic notch
I: anterior fossa at medial aspect of greater trochanter w/ tendons of obturator internus and inf. gemellus
A: lateral rotation of thigh
NS: N. to obturator internus and sup. gemellus from sacral plexus; ventral divisions of ventral rami L5, S1 and S2
Term
Inferior Gemellus
Definition
O: inferior margin of lesser sciatic notch and superior border of ischial tuberosity
I: anterior fossa at medial edge of greater trochanter, w/ tendons of sup. gemellus and obt. internus
A: lateral rotation of thigh
NA: N. to inf. gemellus and quadratus femoris, ventral divs of L4, L5 and S1
AS: medial femoral circumflex a.
Term
Obturator Internus
Definition
O: pelvic surfaces of obturator foramen and obturator membrane
I: ant. fossa on medial edge of greater trochanter with gemelli muscles
A: external rotation of thigh; extension and abduction of the thigh when hip is flexed
NS: N. to obturator internus and sup. gemellus
AS: superior gluteal and internal pudendal a.
Term
quadratus femoris
Definition
O: external border of ischial tuberosity
I: quadrate tubercle of femur
A: lateral rotation of thigh
NS: N. to inferior gemellus and quadratus femoris; ventral divs of L4, L5 and S1
AS: medial femoral circumflex a.
Term
Obturator Externus
Definition
O: external surfaces of obturator foramen and obturator membrane
I: trochanteric fossa of the femur
A: lateral rotation of thigh; aids in flexion and adduction of thigh
NS: obturator n. ventral division L2, L3, L4 (*only gluteal region muscle to receive innervation from lumbar plexus
AS: obturator a.
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