File:Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct - for the use of schools and colleges (1870) (14782730155).jpg

Identifier: outlinesofcompar00agas (find matches)
Title: Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges
Year: 1870 (1870s)
Authors: Agassiz, Louis, 1807-1873 Gould, Augustus A. (Augustus Addison), 1805-1866 Wright, Thomas, 1809-1884
Subjects: Physiology, Comparative Zoology
Publisher: London : Bell & Daldy
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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its fellowfrom the opposite side, forming the crown of the arch, whilstthe ischium is wedged in between them ; these three bones formthe ossa innominatum of the human anatomist. Figs. 127 and 128 represent these haunch bones, (i) is theilium (n), the ischium, and (in) the pubis. The broad iliacbones form the brim of the pelvis (fig. 125), they afford sup-port to the viscera of the abdomen, and give attachment by boththeir surfaces to the large and powerful muscles by whichthe thigh is moved, and the trunk retained erect upon thelower extremities. The brim of the pelvis («, «, a, a) differs inthe two sexes. In the male (fig. 126), the greatest diameter isin the antero-posterior; in the female (fig. 125), in the trans-verse direction. A comparative view of the outlet (b, b, b, b)(figs. 129 and 130) in a male and female pelvis, shews thisopening to be of a diamond form, having the angles before,behind, and on the sides. In the male (fig. 130), the outlet is Fig. 129. Outlet. Fig. 130^
Text Appearing After Image:
Female. Male. small; in the female (fig. 129), it is large. The greatestdiameter is from the sacrum to the pubis in the female, in con-sequence of the sacrum being less curved than in the male. Thespace comprised between the brim and the outlet is called thetrue pelvis, in which the pelvic viscera are lodged. On eachside of the pubic arch a large oval hole (obturator foramen),is formed by the ischium and pubis. It Fig. 131. gives passage to blood vessels and nerves,and is partly closed by a ligament. Oneach side of the obturator hole, but some-what behind that opening, is the cup-shaped cavity for receiving the head of thethigh bone (acetabulum) (fig. 131, e),formed by the junction of the ilium (i),

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