Gluteus medius muscle
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| Gluteus medius | ||
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| The gluteus medius and nearby muscles | ||
| Gray's | subject #128 474 | |
| Origin: | Gluteal surface of ilium, under gluteus maximus | |
| Insertion: | Greater trochanter of the femur | |
| Artery: | superior gluteal artery | |
| Nerve: | superior gluteal nerve (L4, L5, S1 nerve roots) | |
| Action: | abduction of the hip; preventing adduction of the hip. Medial rotation of thigh. | |
| Antagonist: | lateral rotator group | |
The gluteus medius, one of the three gluteal muscles, is a broad, thick, radiating muscle, situated on the outer surface of the pelvis.
Its posterior third is covered by the gluteus maximus, its anterior two-thirds by the gluteal aponeurosis, which separates it from the superficial fascia and integument.
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[edit] Origin and insertion
It arises from the outer surface of the ilium between the iliac crest and posterior gluteal line above, and the anterior gluteal line below; it also arises from the gluteal aponeurosis covering its outer surface.
The fibers converge to a strong flattened tendon, which is inserted into the oblique ridge which runs downward and forward on the lateral surface of the greater trochanter.
[edit] Relations
A bursa separates the tendon of the muscle from the surface of the trochanter over which it glides.
[edit] Action
The Glutæi medius and minimus abduct the thigh, when the limb is extended, and are principally called into action in supporting the body on one limb, in conjunction with the Tensor fasciæ latæ.
Their anterior fibers, by drawing the greater trochanter forward, rotate the thigh inward, in which action they are also assisted by the Tensor fasciæ latæ.
[edit] Variations
The posterior border may be more or less closely united to the piriformis, or some of the fibers end on its tendon.
[edit] Additional images
 Right hip bone. External surface. |
 Right femur. Posterior surface. |
 Structures surrounding right hip-joint. |
 The arteries of the gluteal and posterior femoral regions. |
 Nerves of the right lower extremity Posterior view. |
 Surface anatomy of the back. |
[edit] External links
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
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