Gluteus medius muscle
- Common: abduction (abduction )
- Front portion: pronation ( internal rotation ) and flexion (flexion )
- Rear portion: eversion ( external rotation ) and stretching ( extension) of the hip joint
Animals: stretching
The Musculus glut ( a) eus medius (Latin for " middle gluteal muscle ") is a skeletal muscle of the lower extremity, specifically the posterior ( dorsal) layer of the posterior hip muscles. He is almost completely from the gluteus maximus muscle ( gluteus maximus) covered.
Course
The central gluteal muscle originates on the ilium ( ilium ), more precisely on the outer surface (facies glut ( a) ea ) of the ilium (Ala ossis Ilii ) between the two pelvic lines ( Linea glut ( a) ea anterior and Linea glut ( a) ea posterior ) from the iliac crest ( iliac crest ) and its connective tissue sheath ( fascia ) ( aponeurosis glut ( a) ea). The fibers unite and pull together like a cap to the greater trochanter ( great trochanter ) of the femur (femur).
A bursa (Bursa musculi trochanteric glut ( a) an medii ) between the tendon and the greater trochanter reduces friction.
Function
The central gluteal muscle straddles the thigh at the hip to the side ( abduction). During walking and running it stabilizes together with the small gluteal muscle ( gluteus minimus ) the pelvis ( pelvis ) and prevents its sinking into the swing leg side.
The front portion of the central buttock muscle rotates the thighs also inward ( internal rotation ) and prevents it ( flexion), the rear portion on the other hand rotates the thigh outward ( external rotation ) and stretches it (extension).
In the four-footed mammals, it is the strongest of the hip muscles and the main extensors ( extensor ) of the hip joint. He is largely responsible for the advancement of the body through these muscle action. The rotation and Abspreizwirkung play virtually no role.
Paralysis
With simultaneous paralysis of the medium and small buttocks muscle it comes to the so-called waddling gait, that is, at each step tilts the pelvis on the swing leg side ( Trendelenburg sign). Typical cause such a paralysis are intramuscular injections.