Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges . Female. Male. in the lower of the pelvic arches. The scapular arch presentsmany modifications, to adapt the anterior members as instru-ments for prehension and locomotion. The pelvic arch is of amore uniform structure, as the posterior extremities form in-struments of locomotion alone. § 263. The PELYIC AECH (fig. 125) is composed of three pairof bones, which are separate in infancy, but soldered togetherin the adult. One of these bones,
Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges . Female. Male. in the lower of the pelvic arches. The scapular arch presentsmany modifications, to adapt the anterior members as instru-ments for prehension and locomotion. The pelvic arch is of amore uniform structure, as the posterior extremities form in-struments of locomotion alone. § 263. The PELYIC AECH (fig. 125) is composed of three pairof bones, which are separate in infancy, but soldered togetherin the adult. One of these bones, the ilium (a), is firmly Fisr. 127. Fiff. THE PELYIC ARCH. 137 united to the sacrum, and another, the pubis, joins 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
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1870
