Posterior Thigh, Gluteal Region Flashcards
gluteus muscles anterior to posterior
gluteus minimus
gluteus medius
gluteus maximus
muscles that steady the femoral head in acetabulum
the short external rotators of the hip (piriformis obturator internus superior gemellulus inferior gemellus quadratus femorus obturator externus)
short external rotators of the hip
piriformis obturator internus superior gemellulus inferior gemellus quadratus femorus obturator externus
action of all of the short external hip rotators
externally rotate extended thigh
abduct flexed thigh
steady femoral head in acetabulum
muscle that is an extremely important surgical landmark in femur fracture repairs
piriformis
all deep nerves of the gluteal region pass inferior to piriformis except:
superior gluteal nerve (passes superiorly)
nerve that supplies the gluteus medius and minimus
superior gluteal nerve
separates buttocks from each other
natal cleft
groove that marks the lower limit of buttock and upper limit of thigh
gluteal sulcus
connects ischial tuberosity to sacrum
sacrotuberous ligament
passageway for structures entering and leaving the pelvis (like the sciatic nerve)
sacrotuberous ligament
connects sacrum and ischial spine
sacrospinous ligament
converts greater sciatic notch into greater sciatic foramen
sacrotuberous ligament
converts lesser sciatic notch to lesser sciatic foramen
sacrospinous ligament
passageway for structures entering and leaving perineum
sacrospinous ligament
innervates gluteus maximus
inferior gluteal nerve
innervates gluteus medius
superior gluteal nerve
innervates gluteus minimus
superior gluteal nerve
innervates the piriformis
branches of ventral rami of S1, S2
action of gluteus maximus
extend thigh (especially from flexed position) assist in external rotation of thigh steady thigh, assist in rising from sitting position
action of gluteus medius
abduct and internally rotate thigh
action of gluteus minimus
abduct and internally rotate thigh
action of piriformis
externally rotate extended thigh
abduct flexed thigh
steady femoral head in acetabulum
innervates the obturator internus
nerve to obturator internus
attachments of obturator internus
obturator membrane & greater trochanter
superior gemellus innervation
nerve to obturator internus
action of superior gemellus
externally rotate extended thigh
abduct flexed thigh
steady femoral head in acetabulum
muscles that steady femoral head in acetabulum
superior gemellus obturator internus piriformis inferior gemellus quadratus femoris obterator externus
action of inferior gemellus
externally rotate extended thigh
abduct flexed thigh
steady femoral head in acetabulum
action of quadratus femoris
externally rotate extended thigh
abduct flexed thigh
steady femoral head in acetabulum
innervates quadratus femoris
nerve to quadratus femoris
action of obturator externus
externally rotate extended thigh
abduct flexed thigh
steady femoral head in acetabulum
innervates obturator externus
obturator nerve
supply skin over gluteal region as far as the greater trochanter
superior cluneal nerves
supply skin and subcutaneous tissue over sacrum and adjacent area of buttock
middle cluneal nerves
muscles that make up the hamstrings
adductor magnus (hamstrings part)
biceps femoris (short and long heads)
semitendinosus
semimembranosus
only hamstring muscle that doesn’t cross the hip joint
biceps femoris short head
attachments of gluteus maximus
proximal: ilium, sacrum, coccyx
distal: most fibers end in iliotibial tract that inserts into lateral condyle of tibia; some insert on gluteal tuberosity
innervation of gluteus maximus
inferior gluteal nerve
action of gluteus maximus
extend thigh & assist in lateral rotation
steady thigh
assist in rising from sitting position
also helps stabilize knee d/t attachment on ITB