A manual of anatomy . of the ventral margin of the clavicle, from the lateralmargin of the acromion, from the inferior margin of the spine of thescapula and from the fascia covering the infraspinatus muscle. Itis inserted into the deltoid tubercle of the shaft of the humerus. Action.—Abducts the humerus to a right angle with the glenoidfossa of the scapula. Assists in drawing the arm forward (ventrally)and backward (dorsally). Nerve Supply.—Axillary, or circumflex nerve (C. 5, 6). i8o MYOLOGY The m. supraspinatus arises from the bulk of the supraspinousfossa and the fascia covering the muscle
A manual of anatomy . of the ventral margin of the clavicle, from the lateralmargin of the acromion, from the inferior margin of the spine of thescapula and from the fascia covering the infraspinatus muscle. Itis inserted into the deltoid tubercle of the shaft of the humerus. Action.—Abducts the humerus to a right angle with the glenoidfossa of the scapula. Assists in drawing the arm forward (ventrally)and backward (dorsally). Nerve Supply.—Axillary, or circumflex nerve (C. 5, 6). i8o MYOLOGY The m. supraspinatus arises from the bulk of the supraspinousfossa and the fascia covering the muscle and is inserted into theproximal facet of the greater tubercle of the humerus and into thecapsular ligament. Action.—Assists the deltoid in abducting the arm. Nerve Supply.—Suprascapular nerve (C. 5, 6). The m. infraspinatus arises from the bulk of the infraspinousfossa and the fascia covering it and is inserted into the middle facetof the greater tubercle of the humerus. Trapezius Clav/cle Atnmion Oeltoideas. Infraspinatus fascia Teres maior Latissimus X L ono head of tncepa brachiiTriceps brachii Extensor carpiradialis lonous External iniei—muscular septum Outer head of triceps brachiiInner head of friceps brachii External epicondyteOlecranon ^j9ntibrachialfascia Fig. 139.—The deltoid and muscles of the upper arm seen from the side. {Soholta and McMurrich.) Action.—Assists in abducting the arm and when raised assists indrawing the arm dorsally. Nerve Supply.—Suprascapular nerve (C. 5, 6). The m. teres minor arises from the dorsal surface of the axillarymargin of the scapula (proximal two-thirds) and the intermuscularsepta and is inserted into the distal facet of the greater tubercle ofthe humerus. Action.—Rotates the humerus laterally. THE FASCIA AND MXTSCLES OF THE ARM I»I Nerve Supply.—Axillary, or circumflex nerve (C. 5, 6). The m. teres major arises from the inferior third of the dorsalaspect of the axillary margin of the scapula and from the intermus
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecthumananatomy, bookyea
