File:On the anatomy of vertebrates (electronic resource) (1866) (14569154867).jpg

Identifier: b20416039_001 (find matches)
Title: On the anatomy of vertebrates (electronic resource)
Year: 1866 (1860s)
Authors: Owen, Richard, 1804-1892
Subjects: Anatomy, Comparative Vertebrates Fishes Reptiles Mammals Birds
Publisher: London : Longmans, Green
Contributing Library: Wellcome Library
Digitizing Sponsor: Wellcome Library

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er upper, ib. «, and a longer lower lobe, ib. d, resembling theprehensile part of the Elephants proboscis; the surface is finelyrugous, and bedewed by adhesive secretion. Between the bulband the base the glossohyal sheath is immediately surrounded byfibrous, degenerating into lax elastic, tissue, covered by the lingualskin, which is thrown into circular rugae or rings, in the contractedstate (as in fig. 297, A, b, and in c, where this part of the tongueis exposed by divaricating the geniohyoid muscles, c). The tissueof the glossohyal sheath consists chiefly of unstriped muscular fibres,arranged transversely. The longitudinal fibres are those of a pairof4 glossohyoidei, extending along the sides of the annular exten-sile part, and spreading out at the bulbous part, of the tongue.The circular fibres, strongly contracting, diminish the thickness,increase the length, and, squeezing the smooth supporting style, slipoff the elongated part of the tongue from its fore part with a certain 297
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Tongue of the Chameleon, ccxl. jerk. But with this action is associated a more powerful propellerof the weighted bulbous end of the tongue, exercised by themuscles of its bony support. The geniohyoidei, fig. c, c, and a, e, 438 ANATOMY OF VERTEBRATES. draw forward the basihyal upon the ends of the ceratohyals, k,which are steadied by the slender muscles i ceratomandibularis,/*,and 6 ceratosternalis, h : so that the inverted bony arch, frombeing vertical, as at A, k, is made horizontal, as at B, k; the basi-hyal being brought forward about an inch, and with a force andprecision, due to the fixation of the ceratohyal tips, by their guy-rope-like muscles, f and h, which adds greatly to the propellingforce. This force, added to, and acting consentaneously with, theelongation of the annulose part of the tongue, h, A and B, jerksout the swollen prehensile end of the tongue to the full extentallowed by its elastic yielding tissue, which, on the cessation ofthe muscular actions and their mome

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