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table 10.9 muscler crossing the shoulder joint : Movement of the Arm…
table 10.9 muscler crossing the shoulder joint : Movement of the Arm (Hmuners )
ORIGIN (O AND INSERTION(I)
0—infraspinous fossa of scapula I—greater tubercle of humerus posterior to insertion of supraspinatus
NERVE SUPPLY
Suprascapular nerve
ACTION
Rotates arm laterally; helps hold head of humerus in glenoid cavity, stabilizing the shoulder joint
MUSCLE
Infraspinatus* (in"frah-spi-nah"tus) (infra = below)
DESCRIPTION
Partially covered by deltoid and trapezius; named for its scapular location; a rotator cuff muscle
ORIGIN (O) AND INSERTION (I)
0—supraspinous fossa of scapula I—superior part of greater tubercle of humerus
NERVE SUPPLY
Suprascapular nerve
ACTION
Inities abduction of arm, stabilizing shoulder joint Initiates abduction of arm, stabilizes shoulder joint; helps prevent downward dislocation of humerus, as when carrying a heavy suitcase
MUSCLE
Supraspinatus* (soo"prah-spi-nah'tus) (supra = above, over; spin = spine
DESCRIPTION
Named for its location on posterior aspect of scapula; deep to trapezius; a rotator cuff muscle