. On the anatomy of vertebrates [electronic resource] . d as to be unequal to the trans-mission of volitional influence to theorgans mainly supplied from the sym-pathetic ganglions: but they may bethe media of conveying thereto invo-luntary influence and the stimulus ofviolent emotions : and, conversely, theymay convey the sensations of pain fromthe irritated ganglion to the encepha-lon. The sympathetic system mainlygoverns nutritive and secretive processes and involuntary move-ments; it influences the contractile power of bloodvessels, thecoats of which, in all Mammals, show a considerable pl
. On the anatomy of vertebrates [electronic resource] . d as to be unequal to the trans-mission of volitional influence to theorgans mainly supplied from the sym-pathetic ganglions: but they may bethe media of conveying thereto invo-luntary influence and the stimulus ofviolent emotions : and, conversely, theymay convey the sensations of pain fromthe irritated ganglion to the encepha-lon. The sympathetic system mainlygoverns nutritive and secretive processes and involuntary move-ments; it influences the contractile power of bloodvessels, thecoats of which, in all Mammals, show a considerable plexiformsupply from the sympathetic system. § 213. Organs of Touch.—In considering such parts in Mam-malia, the sensibility of their highly organised integument, exem-plified by its agitation in the horse on the contact of a fly, mustbe distinguished from the special adaptations of parts or appen-dages of the skin for purposes of tactile exploration. Increasedsupply of bloodvessels and nerves to a part of the tegument1 liv. p. 117. 2 lb. p. 117. 140. Small ganglion from posterior wall ofthe cervix of an impregnated uterusof a Cow. lxxvii. ORGAN OF TOUCH IN MAMMALIA. 187 which is thin, soft, or papillose, exalts its sensibility ; as, forexample, in the lips, at the end of a teat, of a clitoris or penis,and to a degree, in the latter instances, approaching the cha-racter of a special sensation. In land-mammals the hair is notdeveloped on the more sensitive surfaces, and the skin there iscommonly thinnest. Man exemplifies the maximum of dermalsensibility through the comparative thinness and general naked-ness of his integument. That which covers the broad tips of thefingers is unusually vascular, and richly supplied with penicellateplexuses of nerves : the filaments to the papilla? seem to terminatein condensed corpuscles of cellular tissue, certainly continuouswith the terminal neurilemma—the 6 corpuscula tactus or axilecorpuscles,—occupying, each, the centre of a papilla.
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