Practical human anatomy [electronic resource] : a working-guide for students of medicine and a ready-reference for surgeons and physicians . EMITY. lar ligament of the shoulder-joint. It is attached : internally,to the ridges on the anterior surface of the scapula ; externally,to the inner tuberosity of the humerus. Dissection.—Section the serratus magnus muscle (Plate 157); the anteriorof the thorax, the anterior of the neck, and the region of the back having beendissected, this section of the serratus magnus muscle will sever the upper ex-tremity from the trunk. POSTEEIOE OF THE SHOULDER AND
Practical human anatomy [electronic resource] : a working-guide for students of medicine and a ready-reference for surgeons and physicians . EMITY. lar ligament of the shoulder-joint. It is attached : internally,to the ridges on the anterior surface of the scapula ; externally,to the inner tuberosity of the humerus. Dissection.—Section the serratus magnus muscle (Plate 157); the anteriorof the thorax, the anterior of the neck, and the region of the back having beendissected, this section of the serratus magnus muscle will sever the upper ex-tremity from the trunk. POSTEEIOE OF THE SHOULDER AND ARM. Dissection.—Extend the upper extremity—detached from the trunk—withits posterior surface uppermost. Elex the elbow, so as to put the muscles ofthe posterior of the arm upon the stretch. Terms of Relation.—The general terms anterior audi poste-rior (page 2); and the special terms proximal and distal (to-ward, and from, the trunk), and inner and outer, are used tolocate parts in this portion of the dissection. Bones and Bone Areas of Muscle Attachments, Plate158 —The posterior surfaces of the scapula, the clavicle, the. humerus, and the proximal end of the ulna, form the osseousframework of this portion of the dissection. All of these bonesurfaces afford areas for muscle attachments. Dissection.—When the dissections of the anterior of the arm and of theback have preceded that of this dissection, make skin incisions 1 and 2 of Fig-ure 12, and dissect away the skin from the arm. Where the anterior of the armand the back have not been dissected make the skin incisions 1, 2, and 3, ofFigure 12, and reflect flaps as indicated. Find and trace the nerves in the sub-cutaneous plane, and clear the surface of the fascia. POSTEKIOE OF SHOULDER AKD ARM. 289 3. Cutaneous Branch of Circumflex Nerve, Plate 159.—This nerve appears at the distal halt of the posterior border ofthe deltoid muscle ; from the internal surface of the distributes to the distal portion of
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