. The chordates. Chordata. Mammalia: Skin, Muscles, Skeleton 587. Fig. 154. Superficial lateral trunk muscles in a reptile (Sphenodon) and a mammal (Felis). The metamerism of the lateral trunk muscles, which is such a striking feature of the lower vertebrates, is reduced and modified in reptiles and almost disappears in adult mammals. (Courtesy, Neal and Rand: "Ghordate Anatomy," Philadelphia, The Blakiston Company.) elasticity of the lungs and of the thoracic wall, but it may be hastened or strengthened by contraction of muscles of the abdominal wall. In the abdominal wall there are
. The chordates. Chordata. Mammalia: Skin, Muscles, Skeleton 587. Fig. 154. Superficial lateral trunk muscles in a reptile (Sphenodon) and a mammal (Felis). The metamerism of the lateral trunk muscles, which is such a striking feature of the lower vertebrates, is reduced and modified in reptiles and almost disappears in adult mammals. (Courtesy, Neal and Rand: "Ghordate Anatomy," Philadelphia, The Blakiston Company.) elasticity of the lungs and of the thoracic wall, but it may be hastened or strengthened by contraction of muscles of the abdominal wall. In the abdominal wall there are ordinarily no ribs. In rare cases the first lumbar vertebra bears a pair of ribs. They sometimes appear, as an anomaly, in man, being known as "gorilla ribs" because they commonly occur in the gorilla. Aside from the vertebral column there are usually no skeletal parts of any sort between the diaphragm and the pelvic girdle. In the ventral abdominal wall of monotremes and marsupials, however, there is usually a pair of epipubic or marsupial bones supporting the marsupial pouch (when present). They are attached to the pubes. In the absence of ribs, the segmental myoseptums are obliterated throughout the greater part of the abdominal wall. The primary segmentation is retained only by certain short muscles passing from one vertebra to the next. Except for the muscles that lie closely adja- cent to the vertebral column, the muscles of the abdominal wall consist. 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 Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : Blakiston
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