File:Anatomy, descriptive and surgical (electronic resource) (1860) (14764681105).jpg

Identifier: b20386424 (find matches)
Title: Anatomy, descriptive and surgical (electronic resource)
Year: 1860 (1860s)
Authors: Gray, Henry, 1825-1861 Carter, H. V., ill Westmacott, John Guise, Dr, ill
Subjects: Anatomy
Publisher: London : J.W. Parker
Contributing Library: Wellcome Library
Digitizing Sponsor: Wellcome Library

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acarpi pollicis, the Extensor secundi internodii pollicis, andthe Extensor indicis muscles. The internal surface is broad and concave above, narrow and convex below.It gives attachment by its upper three-fourths to the Flexor profundus digitorummuscle; its lower fourth is subcutaneous. The Lower Extremity of the ulna is of small size, and excluded from the articu-lation of the wrist joint. It presents for examination two eminences; the outerand larger is a rounded articular eminence, termed the head of the ulna. Theinner narrower and more projecting, is a non-articular eminence, the styloidprocess. The head presents an articular facet, part of which, of an oval form, isdirected downwards, and plays on the surface of the triangular fibro-cartilage,which separates this bone from the wrist joint; the remaining portion, directedoutwards, is narrow, convex, and received into the sigmoid cavity of the radius.The styloid process projects from the inner and back part of the bone, and descends
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io6 OSTEOLOGY. a little lower than the head, terminatirxg in a rounded summit, which affords attach-ment to the internal lateral ligament of the wrist. The head is separated fromthe styloid process by a depression for the attachment of the triangular inter-articular fibro-cartilage; and behind, by a shallow groove for the passage ofthe tendon of the Extensor carpi ulnaris. Structure. Similar to that of the other long bones. Development. By three centres; one for the shaft, one for the inferior extremity,and one for the olecranon (fig. 92). Ossification commences near the middle ofthe shaft about the fifth week, and soon extends through the greater part of thebone. At birth, the ends are cartilaginous. About the fourth year, a separate92.—Plan of the Development of the Ulna. osseous nucleus appears in the middleBy 3 Centres. of the head, which soon extends into Olecrmi^yz, the styloid process. About the tenth Ajjpears atwthy2^^^^^^^oi,n.-iSlictftac ^C^) zf- year, ossific matter appea

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