. A manual of zoology. Zoology. ir. VERTEBRATA. 645 stapes. Most students believe incus and malleus to be parts (quadrate and articulare) of the mandibular arch—a viev/ which has its oj)ponents, who believe these to be a divided columella ffig. 57:). The tympanic membrane is usually flush with the surrounding skin or only slightly below its level. In the mammals it is pro- tected by being placed at the bottom of a deep tube, the exteriial auditory meatus. The ear conch, a fold of skin supported by cartilage, is also confined to the mammals. The more imj)ortant vegetative organs of the body are
. A manual of zoology. Zoology. ir. VERTEBRATA. 645 stapes. Most students believe incus and malleus to be parts (quadrate and articulare) of the mandibular arch—a viev/ which has its oj)ponents, who believe these to be a divided columella ffig. 57:). The tympanic membrane is usually flush with the surrounding skin or only slightly below its level. In the mammals it is pro- tected by being placed at the bottom of a deep tube, the exteriial auditory meatus. The ear conch, a fold of skin supported by cartilage, is also confined to the mammals. The more imj)ortant vegetative organs of the body are enclosed in a large body cavity or ccelom beneath the vertebral column. This is, as development shows, an outgrowth from the primi- tive digestive tract, an enterocode (pp. 109 and 158), lined with ejiithelium. Since it arises, as in other codomate animals, by paired outgrowths from the archenteron, it follows that at first the two cavities must be separated by a partition. E IG of vertebrate in abdominal region. (From Kingsley.) o, dorsal acjrta; f, ; (/, i^nnn.!; gl, glomerulus; i, digestive tract; (liver; m. mesen- tery run, muscular part of myotomes; mj/, its co-lom (myocele); "Omentum, ,s, spinalcord; «,,»,,, somatic and splanchnic epithelia; (, nepliridial tubule; l-m, ventral mesentery ; ic, \V(jlftiau duct. which also encloses the intestinal tract (lig. 57S). These walls furnish the mesentery which supports the intestine in its. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
