. Cunningham's Text-book of anatomy. Anatomy. MUSCLES OF THE PECTOEAL KEGION. 371 or other of the above-named slips is occasionally present, crossing the floor of the axilla in the interval between the latissimus dorsi and the pectoralis major. They take origin from the costal cartilages, ribs, or borders of the pectoralis major (chondroepitrochlearis, axillary arches, costo- coracoideus), or from the border of the latissimus dorsi (dorsoepitrochlearis, axillary arches, costo- coracoideus). Their insertion is variable. The chondroepitrochlearis and dorsoepitrochlearis are inserted into the fas
. Cunningham's Text-book of anatomy. Anatomy. MUSCLES OF THE PECTOEAL KEGION. 371 or other of the above-named slips is occasionally present, crossing the floor of the axilla in the interval between the latissimus dorsi and the pectoralis major. They take origin from the costal cartilages, ribs, or borders of the pectoralis major (chondroepitrochlearis, axillary arches, costo- coracoideus), or from the border of the latissimus dorsi (dorsoepitrochlearis, axillary arches, costo- coracoideus). Their insertion is variable. The chondroepitrochlearis and dorsoepitrochlearis are inserted into the fascia of the arm, the medial intermuscular septum, or the medial epicondyle of the humerus. The axillary arches are inserted into the border of the pectoralis major, the fascia of the arm, or the coracobrachialis or biceps muscle. The costocoracoideus, arising from the ribs or the aponeurosis of the obliquus externus, or detaching itself from the border of the pectoralis major or latissimus dorsi, is attached to the coracoid process, alone or along with one of the muscles attached to that bone. These variable slips of muscle are supplied by the medial anterior thoracic nerve, the medial cutaneous nerve of the arm, or the intercosto- brachial. M. Pectoralis Minor.—The pectoralis minor is a narrow, flat, triangular muscle. It arises, under cover of the pectoralis major, from (1) the surfaces and superior borders of the third, fourth, and fifth ribs near their anterior ends, and (2) from the fascia covering the third and fourth intercostal spaces between these ribs. It may have an additional origin from the second rib (Eig. 414, p. 468); and that from the fifth rib is often absent. Directed obliquely upwards and laterally, it is inserted by a short, flat tendon into the lateral half of the anterior border and upper surface of the coracoid process (Fig. 333, p. 372), and usually also into the conjoint origin of the biceps brachii and coracobrachialis. It enters into the formation o
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
