OCR Text |
Show 1895.] MUSCULAR ANATOMY OF XENOPUS. 843 2 of my paper upon Pipal. But it has a different origin. The accompanying drawing (fig. 1) illustrates the muscle in question with various adjacent structures, gl. is a large muscle which I describe later as the "gluteeus," though it may represent the gluteeus and a psoas magnus-the "psoas" of m y subsequent description (not visible in the present drawing) being in that case a psoas minor. Not far from the anterior end of this gluteeus there arises between its two heads (dorsal and ventral) a stoutish flat muscle (m.p.) of a coarse texture from the edge of the ilium. I was at first disposed to suspect that this muscle dipping down between tbe two, thus separating portions of the gluteeus, might run parallel with them, but hidden from sight, to be inserted on to the femur. But a careful dissection showed that this was not the case. Some of the fibres of this muscle are attached to the lung in front, others passing round behind it; others again accompanying these, pass round behind the lung and traversing the ligamentum latum are inserted upon the oesophagus (woodcut fig. 2). The main mass of the muscle, however, traverses the floor of the chamber already spoken of as underlying the stomach, and is inserted on to the oesophagus and on to a fibrous aponeurosis lying behind the lung. Fig. 2. Lung, oesophagus, and related musculature in Xenopus. L, lung; (Es., oesophagus. (2) The obliquus internus, as in Rana and in Pipa (see above, p. 831, fig. 2 ), enters into the formation of the diaphragm; a few muscular slips (fig. 1, et) are given off, which are attached to the base of the lung, traversing the mesentery already spoken of which connects the lung with the parietes. A large portion of the muscle, 1 Loc. cit. |