Gluteus medius muscle

Gluteus medius muscle


Gluteus medius
Posterior Hip Muscles 3.PNG
The gluteus medius and nearby muscles
Gluteus medius muscle.PNG
Muscles of the gluteal and posterior femoral regions with origin and insertion of gluteus medius muscle labeled
Latin musculus gluteus medius
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)
Actions abduction of the hip; preventing adduction of the hip. Medial rotation of thigh.
Antagonist lateral rotator group

The gluteus medius (or glutæus 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.

Contents

Relations

A bursa separates the tendon of the muscle from the surface of the trochanter over which it glides.

Origin and insertion

The gluteus medius muscle starts, or "originates," on the outer surface of the ilium between the iliac crest and the posterior gluteal line above, and the anterior gluteal line below; the gluteus medius also originates from the gluteal aponeurosis that covers its outer surface.

The fibers of the muscle converge into a strong flattened tendon that inserts on the lateral surface of the greater trochanter. More specifically, the muscle's tendon inserts into an oblique ridge that runs downward and forward on the lateral surface of the greater trochanter.

Action

With the leg in neutral (straightened), the gluteus medius and gluteus minimus function together to pull the thigh away from midline, or "abduct" the thigh. During gait, these two muscles function principally in supporting the body on one leg, in conjunction with the tensor fascia lata, to prevent the pelvis from dropping to the opposite side.

Additionally, with the hip flexed the gluteus medius and minimus externally rotate the thigh. With the hip extended, the gluteus medius and gluteus minimus internally rotate the thigh.[1]

Dysfunction of the gluteus medius or the superior gluteal nerve can potentially be indicated by a positive Trendelenburg's sign.

Variations

The posterior border may be more or less closely united to the piriformis, or some of the fibers end on its tendon.

The posterior fibres of gluteus medius contract to produce hip extension, lateral rotation and abduction. During gait, the posterior fibres help to decelerate internal rotation of the femur at the end of swing phase.

Additional images

See also

References

  1. ^ Pratt, N. Clinical Musculoskeletal Anatomy. CBLS: Marietta, OH 2004.

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 within it may be outdated.


Wikimedia Foundation. 2010.

Нужно сделать НИР?

Look at other dictionaries:

  • gluteus medius muscle — musculus gluteus medius …   Medical dictionary

  • Gluteus maximus muscle — gluteus maximus The gluteus medius and nearby muscles …   Wikipedia

  • Gluteus minimus muscle — Muscle infobox Name = Gluteus minimus Latin = GraySubject = 128 GrayPage = 475 Caption = The gluteus minimus and nearby muscles Caption2 = Structures surrounding right hip joint. (Gluteus minimus visible at center left.) Origin = Gluteal surface… …   Wikipedia

  • uncompensated gluteus medius gait — a gait that occurs with moderate weakness of the gluteus medius muscle; with each step of the affected leg, the pelvis on the opposite side dips, causing protrusion of the stationary affected hip. Cf. Trendelenburg g …   Medical dictionary

  • musculus gluteus medius — [TA] gluteus medius muscle: origin, lateral surface of ilium between anterior and posterior gluteal lines; insertion, greater trochanter of femur; innervation, superior gluteal; action, abducts and rotates thigh medially …   Medical dictionary

  • trochanteric bursae of gluteus medius muscle — bursae trochantericae musculi glutei medii …   Medical dictionary

  • gluteus medius — noun the middle of the three gluteal muscles • Hypernyms: ↑gluteus, ↑gluteus muscle, ↑gluteal muscle, ↑glute * * * /mee dee euhs/, pl. glutei medii /mee dee uy /. the muscle of the buttocks lying between the gluteus maximus and the gluteus… …   Useful english dictionary

  • gluteus medius — /mee dee euhs/, pl. glutei medii /mee dee uy /. the muscle of the buttocks lying between the gluteus maximus and the gluteus minimus, involved in the abduction of the thigh. [ < NL: middle gluteus] * * * …   Universalium

  • Muscle — is the tissue of the body which primarily functions as a source of power. There are three types of muscle in the body. Muscle which is responsible for moving extremities and external areas of the body is called "skeletal muscle." Heart… …   Medical dictionary

  • Muscle Moyen Glutéal — Le muscle moyen fessier. Vue postérieure. Le muscle moyen glutéal (en latin Musculus Gluteus Medius, anciennement muscle moyen fessier) est un muscle du membre pelvien ou inférieur, ou communément jambe, et qui appartient plus précisément aux… …   Wikipédia en Français

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”