OCR Text |
Show 12 MR. E. J. SIDEBOTHAM ON THE [Jan. 20, Third dorsal interosseous.-Arises from radial side of metacarpal of medius in its proximal half, and dorsal surface of metacarpal ot annularis in its proximal third. Similar arched tendon, the larger and thicker portion passing to base of first phalanx ot medius whilst thinner portion passes on to palmar surface of metacarpal ot annularis. Fourth dorsal interosseous.-Arises from dorsal surface of metacarpal of annularis and radial side of metacarpal of minimus. Inserted into palmar surface of heads of metacarpals. Fig. 2. S's. S.'b. Tr. S.L. mcjEt. E.C.D. JEJfJ). B -:F:^--C'jr.&JR0 A.E. p;J<-r.u:r. m'JS.CJH. JFJJ.P. Myology of Water-Opossum. JSS., supraspinatus; Is., infraspinatus; T.ML, teres minor: Da., deltoid, acromial part; Be, deltoid, clavicular part; B.A., brachialis anticus; S.L., supinator longus; E.C.R., extensor carpi radialis longior et brevior; E.C.D., extensor communis digitorum ; E.M.B., extensor minimi digiti; S.B., supinator brevis; E.C.U., extensor carpi ulnaris; A.E., anconeus extemus; Tr., triceps; Sb., subscapulars; P.Ma., pectoralis major; C.B., coraco-brachialis ; T.Ma., teres major; C.H., chondrodiumeral; P.Q., pectoralis quartus; L.B., latissimus dorsi; Tr., triceps; P.L., palmaris longus; P.R.T., pronator radii teres ; A.I., anconeus internus ; E.G. U., extensor carpi ulnaris ; F.D.P., flexor digitorum profundus. Palmar group.-Five in number and have a common origin in palm. The first three pass to radial side of first phalanges of thumb, index, and medius, whilst the other two pass to the ulnar side of the remaining fingers. Intermediate group.-Each finger is provided with a short flexor, each of them consisting of two bellies more or less united and inserted at each side of their respective phalanx, with the exception of the flexor brevis medii, which is single and is inserted into tendon of third dorsal interosseous. |