Lateral rotator group

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Lateral rotator group
Posterior Hip Muscles 1.PNG
The lateral rotator group and the gluteus minimus muscle
Gray344.png
Structures surrounding right hip joint
Gray's p.476
Origin At or below the acetabulum of the ilium
Insertion On or near the greater trochanter of the femur
Artery Inferior gluteal artery, lateral sacral artery, superior gluteal artery
Nerve Obturator nerve, nerve to the Piriformis, nerve to quadratus femoris
Actions Lateral rotation of hip
Antagonist Gluteus minimus muscle, gluteus medius muscle
Anatomical terms of muscle

The lateral rotator group are 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.[1]

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).[2]

Individual muscles[edit]

Muscle origin insertion innervation[2]
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 piriformis muscles 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 piriformis muscles 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 (L5-S2)

Other lateral rotators[edit]

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[edit]

See also[edit]

References[edit]

  1. ^ Mnemonic medicalmnemonics.com 833 3471 657
  2. ^ a b Bojsen-Møller, Finn; Simonsen, Erik B.; Tranum-Jensen, Jørgen (2001). Bevægeapparatets anatomi [Anatomy of the Locomotive Apparatus] (in Danish) (12th ed.). p. 365. ISBN 978-87-628-0307-7. 

External links[edit]