Lateral rotator group

Lateral rotator group
The lateral rotator group and the gluteus minimus muscle, posterior view
Structures surrounding left hip joint
OriginAt or below the acetabulum of the ilium
InsertionOn or near the greater trochanter of the femur
ArteryInferior gluteal artery, lateral sacral artery, superior gluteal artery
NerveObturator nerve, nerve to the Piriformis, nerve to quadratus femoris
ActionsLateral rotation of hip
AntagonistGluteus minimus muscle, gluteus medius muscle
Anatomical terms of muscle

The lateral rotator group is a group of six small muscles of the hip which all externally (laterally) rotate the femur in the hip joint. It consists of the following muscles: piriformis, gemellus superior, obturator internus, gemellus inferior, quadratus femoris and the obturator externus.

All muscles in the lateral rotator group originate from the hip bone and insert on to the upper extremity of the femur. The muscles are innervated by the sacral plexus (L4-S2), except the obturator externus muscle, which is innervated by the lumbar plexus.

Individual muscles

Muscle origin insertion innervation
Piriformis muscle Anterior surface of sacrum between and laterally to the anterior sacral foramina Superior boundary of greater trochanter Nerve to the piriformis (S1-S2)
Gemellus superior muscle Ischial spine Upper edge of Obturator internus muscle tendon (indirectly greater trochanter) Nerve to obturator internus (L5-S2)
Obturator internus muscle Medial surface of obturator membrane and the surrounding bone Medial surface of greater trochanter Nerve to obturator internus (L5-S2)
Gemellus inferior muscle Just above the tuberosity of the ischium Lower edge of Obturator internus muscle tendon (indirectly greater trochanter) Nerve to quadratus femoris (L4-S1)
Quadratus femoris muscle Lateral edge of the tuberosity of the ischium Intertrochanteric crest Nerve to quadratus femoris (L4-S1)
Obturator externus muscle Lateral surface of obturator membrane and the ischiopubic ramus Trochanteric fossa Posterior branch of obturator nerve (L3-L4)

Other lateral rotators

This group does not include all muscles which aid in lateral rotation of the hip joint: rather it is a collection of ones which are known for primarily performing this action. Other muscles that contribute to lateral rotation of the hip include:

Additional images

See also

This page was last updated at 2024-01-03 22:45 UTC. Update now. View original page.

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