Deep muscles of buttocks

Question 1

Deep muscles of buttocks

Answer 1

M. obturatorius externus
M. quadratus femoris
M. obturatorius internus
M. gemelli

Question 2

M. obturatorius externus

Answer 2

Origin: outer surface of pelvis, around foramen obturatum

Insertion: trochanteric fossa of femur

Action:lateral rotation (supination) of hindlimb

Question 3

M. quadratus femoris

Answer 3

Origin: ventral surface of tabula ossis ischii (medial to tuber ischiadicum)
Insertion: trochanteric fossa of femur
Action: extension of hip joint and lateral rotation of hindlimb

Question 4

M. obturatorius internus

Answer 4

Origin: inner surface of pelvis around for.obturatum (from regions of ramus cranialis et caudalis ossis pubis, ramus ossis ischii and tabula ossis ischii)

Insertion: after crossing lesser sciatic notch it will attach in trochanteric fossa of femur; its tendon runs over the muscle belly of m. gemelli

Action: lateral rotation(supination) of hindlimb

Question 5

M. gemelli

Answer 5

Origin: lateral side on corpus ossis ischii (ventral to lesser sciatic notch– incisura ischiadica minor)

Insertion: trochanteric fossa of femur

Action:lateral rotation(supination) of hindlimb