Proceedings of the Royal Irish Academy Volume 9 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1867 Excerpt: ...0-37 oz. 22. M. palmaris longus, 0-18 oz. 23. M. flexor sublimis digitorum, 0-77 oz. 24. M. flexor carpi ulnar is, 0'73 oz. 25. M. supinator radii longus, 0-77 oz. 26. M. extensor carpi radialis longior, 0-33 oz. 27. M. extensor carpi radialis brevior, 032 oz. 28. M. extensor digitorum communis, 0-34 oz. 29. M. auricularis, 0'08 oz. This little muscle sends a tendon to the 4th as well as to the 5th finger. 30. M. extensor carpi ulnaris, 0-28 oz. 31. If. flexor digitorum profundis, 1-95 oz M. flexor pollicis longus, J There is no distinct flexor pollicis longus; but a tendon branches off to the thumb, from the central portion of the tendon of the flexor digitorum profundus, that supplies the 3rd and 4th fingers. I found by trial that the weights of equal lengths of the thumb tendon and common tendon to the other four fingers were as 116 to 243; showing that one-third of the whole force of the muscle is expended on the thumb, and the remaining two-thirds on the other fingers--for it is easy to see that the forces acting along the subdivided tendons must be exactly proportional to their strengths as measured by the weights of equal lengths. The peculiarities of the human flexor pollicis longus have always been insisted upon by anatomists as essentially characteristic of Man, as distinguished from the Quadrumans; but exceptions of the most startling kind are occasionally met with. While I was engaged in the dissection of the Macacus ncmestrinus, I called the attention of Mr. Finney, Medical Scholar of Trinity College, to the arrangement of the tendons of the deep flexor, who then mentioned to me the case of a male subject dissected K. I. A. PEOC.--VOL. IX. 2 Q by him in November, 1864. On referring to his note book, I was able to extract the following observati...