muscles of thegluteal region Flashcards
Nerve roots for inferior gluteal nerve
and muscles innervating by it
- (L5,S1,S2)
It supplies the gluteus maximus
Nerve roots for Superior gluteal nerve
and muscles innervating by it
(L4,L5,S1)
supplies gluteus medius,
gluteus minimus
and tensor fasciae latae
Superficial abductors and extenders –
group of large muscles that abduct and extend the femur. Includes the gluteus maximus, gluteus medius, gluteus minimus and tensor fascia lata.
Nerve roots for Sciatic nerve
and muscles innervating by it
(L4,L5,S1,S2,S3)–
gives tibial & common fibular nerves
Nerve roots for Posterior Cutaneous nerve of thigh
and muscles innervating by it
(S1,S2,S3)- supplies skin of scrotum,
labium majus, skin of postero-inferior quadrant of gluteal region
Nerve roots for Nerveto quadratus femoris
and muscles innervating by it
(L4,L5,S1)- supplies quadratus femoris,
inferior gemellus, hip joint
Nerve roots for Pudenda lnerve
and muscles innervating by it
(S2, S3, S4)- supplies ischiorectal fossa
Nerve roots for Nerveto obturator internus
and muscles innervating by it
(L5, S1, S2)- supplies obturator internus & superior
gemellus
Nerve roots for Perforating cutaneous nerve
and muscles innervating by it
(S2,S3)
supplies skin of postero-inferior
quadrant of gluteal region
Deep lateral rotators –
group of smaller muscles that mainly act to laterally rotate the femur. Includes the quadratus femoris, piriformis, gemellus superior, gemellus inferior and obturator internus
The arterial supply to these muscles(gluteal)
is mostly via the superior and inferior gluteal arteries – branches of the internal iliac artery. Venous drainage follows the arterial supply.
CHIEF EXTENSOR
OF THIGH AT HIP
JOINT
Gluteus maximus
POWERFUL
ABDUCTORS OF
THIGH
Gluteus minimus,medias
ABDUCTOR
OF THIGH
Fascia lata muscles
Gluteus maximus(origin,insertion,action and nerve supply)
ORIGIN
*Iliac crest, posterior part of gluteal region, posterior gluteal line, aponeurosis of erector spinae, dorsal surface of lower part of sacrum, Sacrotuberous ligament, fascia covering gluteus maximus.
INSERTION
*Gluteal tuberosity (deep fibresof lower part of muscle)
*Iliotibial tract
NERVE SUPPLY
*Inferior gluteal nerve (L5,S1,2)
ACTION
*Chief Extensorof hip eg.running, climbing stairs
*Lateralrotator of thigh (assists)
*Abductor of thigh (upperfibres)
*Stabilizes knee with tensor fascia lata
Trochanteric anastomosis(Trochantericfossa)
( arteries associated with it and location)
- Superiorgluteal artery(deep branch)
- Medialcircumflexfemoral(↑)
- Lateralcircumflexfemoral(↑)
- Inferiorglutealartery
cruciate aanastomosis ( arteries associated with it and location)
The anastomosis is at the upper part of back of femur=lessertrochanter
* Descending branch of Inferiorgluteal artery
* Ascending branch of 1stperforatingartery(↑)
* Medialcircumflexartery ( )
* Lateralcircumflexfemoral
Gluteus medius(origin,insertion,action and nerve supply)
ORIGIN
*Gluteal surface of ilium between the anterior and
posterior gluteal lines
INSERTION
*Greater trochanter of femur, on oblique ridge on the
lateral surface.
NERVE SUPPLY
*Superiorgluteal nerve (L4, L5, S1)
ACTION
*Powerful abductor
*Medialrotator(anterior fibres)
Gluteus minimus(origin,insertion,action and nerve supply)
ORIGIN
*Gluteal surface of ilium between the anterior and posterior gluteal lines
INSERTION
*Greater trochanter of femur, on a ridge on the lateral part of the anterior surface.
NERVE SUPPLY
*Superior gluteal nerve (L5,S1,2)
ACTION
*Powerful abductor
Posterior
*Medial rotator(anterior fibres)
Gluteus fascia latae(origin,insertion,action and nerve supply
ORIGIN
*Anterior 5cm of the outer lip of the iliac crest up to the tubercle
INSERTION
*Iliotibial tract 3-5cm below the level of greater trochanter.
NERVE SUPPLY
*Superiorgluteal nerve (L4, L5,S1)
ACTION
*Abductor and medialrotator of the thigh
*Extensor of the knee
Gluteus pirifomis(origin,insertion,action and nerve supply
ORIGIN (from within pelvis)
*Pelvic surface of middle three pieces of sacrum by
three digitations.
*Uppermargin of greater sciatic notch and adjoining
areas of sacroiliac joint and sacrotuberousligament.
INSERTION
*Apex of greater trochanter of femur (as rounded tendon)
NERVE SUPPLY
*Ventral rami of S1, S2
ACTION
*Lateralrotator
superior gamelli(origin,insertion,action and nerve supply
ORIGIN
*Posterior surface of ischial spine and upper part of
lesser sciatic notch.
INSERTION
*Blends with tendon of obturator internus & inserts onto
medial surface of greater trochanter of femur.
NERVE SUPPLY
*Nerve to obturator internus (L5, S1, S2)
ACTION
*Lateral rotator of the thigh
inferior gamelli(origin,insertion,action and nerve supply
INFERIOR GEMELLI
ORIGIN
*Upper part of ischial tuberosity and lower part of lesser
sciatic notch.
INSERTION
*Blends with tendon of obturator internus & inserts onto
medial surface of greater trochanter of femur.
NERVE SUPPLY
*Nerve to quadratus femoris (L4, L5, S1)
ACTION
*Lateral rotator of the thigh
obturator internus (origin,insertion,action and nerve supply
ORIGIN
*Pelvic surface of obturator membrane.
*Pelvic surface of body of ischium, ischial tuberosity,
ischiopubic rami and ilium below the pelvic brim.
*Obturatorfascia
INSERTION
*Leaves pelvis through lesser sciatic foramen, passes the
notch and runs laterally to insert on medial surface of
greater trochanter of femur.
NERVE SUPPLY
*Nerve to obturator internus (L5, S1, S2)
ACTION
*Lateral rotator of the thigh
