Researches upon the venom of the rattlesnake : with an investigation of the anatomy and physiology of the organs concerned . on of this muscle are easily seen; for when the externalpterygoid acts, it will necessarily depress the fang. This movement will be morereadily comprehended on reference again to the diagram, Fig. 2, in the text, where])—e marks the line of action of the force applied by the pterygoid muscle to thesuperior maxillary bone and to the edges of the vagina dentis, the sheath of thefang. The action of this muscle is probably aided by the spheno-palatine, whicharises along the
Researches upon the venom of the rattlesnake : with an investigation of the anatomy and physiology of the organs concerned . on of this muscle are easily seen; for when the externalpterygoid acts, it will necessarily depress the fang. This movement will be morereadily comprehended on reference again to the diagram, Fig. 2, in the text, where])—e marks the line of action of the force applied by the pterygoid muscle to thesuperior maxillary bone and to the edges of the vagina dentis, the sheath of thefang. The action of this muscle is probably aided by the spheno-palatine, whicharises along the raphe of the base of the skull, above the spheno-pterygoid andthus nearer the skull, and running diagonally outwards and backwards finds • These bones rest posteriorly against the articulation of the mandibulee of the lower jaw with thezygoma; they consequently share, to some extent, in the movements of this joint. OF THE VENOM OF THE RATTLESNAKE. 9 insertion along the inside of the palatal bone. As its fibres cross those of thespheno-pterygoid, its action antagonizes that muscle and aids the purpose of the Fio-. 3. Myoiogt.—Palatal view of the muscles of the upper jaw and base of the skull, a, spheno-pterygoid muscle—theelevation of the fang is caused by its action on the pterygoid and palate bones ; b, external pterygoid muscle—theretractor of the fang—inserted into the outside of the superior maxillary bone ; c, fascial sheath of this muscleattached to the capsule of the venom gland; d, spheno-palatine muscle. pterygoideus externus. The connection of the palate bone and the pterygoid bones,wliicli we have already noticed, is essential to this result. Almost all of the muscles about the head, neck, and jaws of the serpent, takepart either in the motions which precede the blow, or those which inflict and follow of these muscles have functions which are obvious and easily demonstrable;and we shall, therefore, content ourselves with the briefest reference to
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Keywords: ., bookcentury1800, bookdecade1860, bookidresearch, booksubjectvenom
