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Show 782 MR. ST. GEORGE MIVART ON THE [June 27, intervening between these, and is inserted into the front of the humerus from the head and internal tuberosity to the middle of its shaft. The limit of its insertion begins above at tbe insertions of the epicoraco-humeral and pectoralis major, and below is conterminous with the origin of the brachialis anticus (figs. 8, 9 & 10, CB. 1). From the extent of its insertion this portion appears to me to answer both to the coraco-brachialis proprius vel medius and to tbe rotator humeri or coraco-brachialis superior vel brevis of Mr. Wood*. 10. Flexor surface of right upper arm, the biceps and pectoralis major being cut short. B. Biceps. B. A. Brachialis anticus. C.B.Ik, 2. Coraco-brachialis. E. H. Epicoraco-humeral. P. Pectoralis major. S.L. Supinator longus. T.3&4. Triceps. (2) The second, longer portion (figs. 6, 8, 9 & 10, C. B. 2), which seems to answer to the coraco-brachialis longus of Mr. Wood-f, arises, by muscular fibres, from the posterior end of the sternal border of the coracoid, and is inserted into the internal condyle of the humerus and into the shaft of the bone for a very slight distance above that condyle. There is a glistening tendon on the side next to the bone of the lower half of this portion of the coraco-brachialis. The biceps (figs. 1, 2, 6, 8, 9, 10 & 12, B.) has, as in the Echidna.%, but a single head§, which takes origin, by a very broad tendon (with an aponeurotic longitudinal interval), from the anterior (not sternal) margin of the coracoid and adjacent part of the epicoracoid, and passes backwards so as to be immediately superficial to the short part of the coraco-brachialis. It soon fuses with the brachialis anticus, and is inserted in common with that muscle (by a very strong tendon, which slightly bifurcates below) into the upper parts of both radius and ulna; but the fibres continuous with the biceps * Journal of Anat. and Phys., Cambridge, 1866, vol. i. pp. 48, 49. t Loc. cit. p. 49. \ Trans. Linn. Soc. vol. xxv. p. 385. § Unless what I have named brachialis anticus be a humeral head of the biceps. |
