. On the anatomy of vertebrates [electronic resource] . nalspace; the contraction of the abdominal muscles must draw thebones inward so as to compress the contents of the abdomen, andso far as the connections of the bone permit, which is to a verytrifling degree, the external oblique may draw it outward towardthe ilium, In some Marsupials, as the Koala, the triceps adduc-tor femoris sends a slip of fibres to the external angle of thebase of the marsupial bone, and would more directly tend to bendthat bone outward. The upper or anterior fibres of the internal oblique have theusual origin; the l
. On the anatomy of vertebrates [electronic resource] . nalspace; the contraction of the abdominal muscles must draw thebones inward so as to compress the contents of the abdomen, andso far as the connections of the bone permit, which is to a verytrifling degree, the external oblique may draw it outward towardthe ilium, In some Marsupials, as the Koala, the triceps adduc-tor femoris sends a slip of fibres to the external angle of thebase of the marsupial bone, and would more directly tend to bendthat bone outward. The upper or anterior fibres of the internal oblique have theusual origin; the lower ones, e, arise fleshy from the outer andanterior spine of the ilium, and for an inch along an aponeuroticchord extended from that process to the upper part of the aceta-bulum : these carneous fibres pass inward and slightly upward,and terminate close to the outer margin of the rectus, where theyadhere very strongly to the transversalis, but give off a separatesheet of thin aponeurosis which is lost in the cellular sheath ofthe posterior rectus. 4. Abdominal muscles, Phalaugista vulpina. 10 ANATOMY OF VERTEBRATES. The fleshy fibres of the transversalis abdominis, f, are closelyconnected by dense cellular tissue with those of the internaloblique; they are arranged in finer fasciculi, and have, as usual,a more transverse direction; they terminate along the same lineas those of the internal oblique in an aponeurosis, g, which iscontinued along the inner or central surface of the posterior rectusto the median line. The lower boundary of the fleshy fibres ofthe transversalis is parallel with the line extended transverselybetween the anterior extremities of the ilia; a fascia, less compactthan an aponeurosis, is continued downward from this margin,and envelopes the cremaster and the constituents of the spermaticchord, as they pass outward and forward beneath the lower edgeof the internal oblique. The pyramidal is, h, arises from the whole inner or mesialmargin of the marsupial bo
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