infraspinatus muscle

(redirected from Infraspinatous)

in·fra·spi·na·tus mus·cle

(in'fră-spī'nŭ-tŭs mŭs'ĕl)
Origin, infraspinous fossa of scapula; insertion, middle facet of greater tubercle of humerus; action, extends arm and rotates it laterally; nerve supply, suprascapular (from fifth to sixth cervical spinal nerves).
Synonym(s): musculus infraspinatus [TA] .

infraspinatus muscle

Shoulder muscle. Origin: medial two-thirds of infraspinatus fossa of scapula. Insertion: posterior side of greater tubercle of humerus. Nerve: suprascapular (C4-C6). Action: rotates arm laterally.
See also: muscle

infraspinatus muscle

A muscle that runs from the back surface of the shoulder blade (SCAPULA) to the back of the upper part of the upper arm bone (HUMERUS). Its action is to rotate the arm outwards.



infraspinatus muscle
see Table 13.3.