Unit 5 - Lower Limb: Gluteal Muscles (Ex. IV)

Question 1

gluteus medius

Answer 1

O: gluteal surface of ilium below iliac crest between A and P gluteal line
I: L surface of greater trochanter of femur
Inn: S gluteal n. (L4-S1)
A: entire muscle - hip abduction and stabilization of pelvis in coronal plane; A part - flexion and internal (M) rotation; P part - extension and external (L) rotation

Question 2

gluteus maximus

Answer 2

O: L part of dorsal surface of sacrum; P part of gluteal surface of ilium; thoracolumbar fascia; sacrotuberous ligament
I: upper fibers - IT tract; lower fibers - gluteal tuberosity
Inn: I gluteal n. (L5-S2)
A: entire muscle - extension and external (L) rotation of hip in sagittal and coronal planes; upper fibers - abduction; lower fibers - adduction

Question 3

gluteus minimus

Answer 3

O: external surface of ilium between A and I gluteal lines
I: A-L surface of greater trochanter of femur
Inn: S gluteal n. (L4-S1)
A: entire muscle - hip abduction and stabilization of pelvis in coronal plane; A part - flexion and internal (M) rotation; P part - extension and external (L) rotation

Question 4

tensor fasciae latae

Answer 4

O: ASIS
I: IT tract
Inn: S gluteal n. (L4-S1)
A: tenses facia lata; abduction, flexion, and internal (M) rotation of hip

Question 5

piriformis

Answer 5

O: pelvic surface of sacrum
I: apex of greater trochanter of femur
Inn: n. to piriformis (direct branch from S plexus) (S1-S2)
A: external (L) rotation, abduction, and extension of hip joint; stabilization of hip joint

Question 6

obturator internus

Answer 6

O: inner surface of obturator membrane and its bony boundaries
I: M surface of greater trochanter
Inn: n. to obturator internus (L5, S1)
A: external (L) rotation, adduction, and extension of hip joint (can also be active in abduction, depending on position)

Question 7

gemelli

Answer 7

O: gemellus S - ischial spine; gemellus I - ischial tuberosity
I: jointly w/ obturator internus tendon (M surface, greater trochanter)
Inn: S - n. to obturator internus (L5, S1); I - n. to quadratus femoris (L5, S1)
A: external (L) rotation, adduction, and extension of hip joint (can also be active in abduction, depending on position)

Question 8

quadratus femoris

Answer 8

O: L border of ischial tuberosity
I: intertrochanteric crest of femur
Inn: n. to quadratus femoris (L5, S1)
A: external (L) rotation and adduction of hip joint