Muscle infra-thorn-bush

The muscle infra-thorn-bush , or infraspinator , is a Muscle posterior cabin of the shoulder. With the muscles subscapular, know-thorn-bush and small round, it composes the Coiffe of the rotators.

Origin

To internal two thirds of the pit under-thorny (or infra-thorny) located under the spine of the Scapula.

of others says (medical college source of Brest) : With the 3/4 médiaux ones of the under-thorny pit (or infra-thorny)

Way

Oblique in top and outwards. The tendon of the muscle infraspinator slips under the posterior face of the Articulation gléno-humérale (or scapulo-humérale) from which it is separated by a séreuse purse.

Termination

Posterior face of the Humérus, on the level of the Trochiter.

another opinion: Facet average Grand tuber (= trochiter)

Physiological action

External of the shoulder and slightly delivery rotator. or side rotation of the arm. he is also abbaissor of the head humérale.

Innervation

Nerve supra-scapular (roots C5-C6).

(Dr.B.lavignolle descriptive anatomy of the upper limb)

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