Text Appearing Before Image: carotid Internal jugular veinSubclavian veinScalenus anterior muscle — Sternum I Perforating branches/_j \ (supplying mam-mary gland) Superior epigastric, runningdown from internal mammary Inferior epigastric, runningup from external iliac Fig. 122.—Showing Subclavian Artery and two of its Branches(Thyroid axis and internal mammaiy) (Morris). The Principal Arteries of the Upper Extremity. The subclavian artery (Fig. 122) passes out over the first riband under the clavicula (therefore subclavian) to the axilla, orarmpit. The brachial plexus lies above it in the neck, and the THE AXILLARY ARTERY. 171 subcla\ian vein is in front of it. The right subcla\dan is a branchof the anonyma. Both subclavians end at the lower border of thefirst rib. Branches.—The vertebral branch runs upward through transverseprocesses of the vertebrae to the brain. The internal mammary branch runs downward inside the chestbehind the ribs (giving some arteries to the mammary gland), intothe abdominal muscle. Text Appearing After Image: Fig. 123.—Subclavian and Axillary Arteries (Testut). The thyroid axis is a short trunk; it gives a branch to thethyroid gland and others to the neck and shoulder. An axis (artery) is a short vessel dividing at once into two or three. The axillary artery is a continuation of the subclavian. Itbegins, therefore, where the subclavian ends—in the apex of theaxilla, at the lower border of the first rib—and continues throughthe axillary space (Fig. 123). .Axillary space, p. 300. 172 ANATOMY AND PHYSIOLOGY FOR NURSES. Branches (thoracic, subscapular, circumflex.)—To all structuresaround the axilla. One, the lateral thoracic, gives arteries to themammary gland. The brachial artery begins where the axillary ends, at thelower border of the axilla, or armpit, and extends downward in
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