. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. PISCES. 971 straight, parallel, and fleshy, passing from the superior margin of the upper jaw to the infe- rior margin of the lower. The third presents a very singular arrange- ment, having its fibres interlaced in a very re- markable manner. These, however, may be divided into three principal masses, two of which are anterior and one posterior.* One of these masses is situated in front of and above the upper jaw near the commissure. It is attached to its superior margin, and runs obliquely to join the external edge of t
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. PISCES. 971 straight, parallel, and fleshy, passing from the superior margin of the upper jaw to the infe- rior margin of the lower. The third presents a very singular arrange- ment, having its fibres interlaced in a very re- markable manner. These, however, may be divided into three principal masses, two of which are anterior and one posterior.* One of these masses is situated in front of and above the upper jaw near the commissure. It is attached to its superior margin, and runs obliquely to join the external edge of the second mass. This latter occupies nearly the same position relative to the lower jaw; it passes be- hind the other and is conjoined with it exter- nally. The third or posterior mass is derived from the end of the upper jaw, and joins the hinder margin of the second. All these fibres so singularly interlaced co-operate in holding the mouth closely shut when the Skate has seized its prey. Lastly, there are two very long muscles de- rived from the spine, which pass between the palate and the cranium to be inserted into the upper jaw. These bring the mass of the mouth forward again after it has been retracted by the broad oblong azygos muscle above described, which passes between the pectoral zone and the inferior maxilla. Fig. 507. a-. 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 Todd, Robert Bentley, 1809-1860. London, Sherwood, Gilbert, and Piper
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