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Show C^66 MR. ST. GEORGE MIVART ON THE Fig. 11. JJJt2i. Deeper muscles of extensor aspect of right forearm, the extensores radiales longior and brevior being cut and reflected. B. Biceps. E*-E9. Extensores metacarporum. E. R. B. Extensor radialis brevior. E. R. L. Extensor radialis longior. E. JJ. Extensor ulnaris. F. U. Flexor ulnaris. M. P. Extensor ossis metacarpi poliicis. P. Q. Pronator quadratus. S. L. Supinator longus. T. Triceps. Coraco-brachialis * (fig. 8, C. B). This muscle consists of two parts :- 1. The first of these, or shorter portion, is a broad muscle like that of the Iguana. It arises, by muscular fibres, from the whole outer surface of the coracoid. It is inserted into the radial tuberosity of the humerus, and into about the upper two-fifths of the shaft of that bone, ending below in a point which extends between the innermost origin of tbe brachialis anticus and the most antero-external origin of the external part of the triceps. 2. The second, longer portion, arises by a strong but rather delicate tendon from the outer margin of the posterior end of the sternal groove of the coracoid. Long and slender, it passes downward, and is inserted, by muscular fibres, into the internal condyle. Triceps f (figs. 1, 8, 10, 11, & 13, T, TI, T2). This muscle only consists of three parts ; and the second and third of these are very closely united. * Meckel, /. c. p. 346. t Meckel. /. c. p. 365. [Dec. 6, |