. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 50<i TEGUMENTARY ORGANS. perfect connective tissue occupying the centre of the papillae, and further distinguished by having their endoplasts and imperfect elastic Fig. A papilla with its Corpusculum tactus surrounded ly three vascular papilla. fibrils arranged transversely to the axis of the papilla, so that they appear to be made up of transverse superimposed laminge (Jig. 320.). One or two dark-contoured nerve tubules come up through the base of the papilla, and running along one side of the corpuscles, thin
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 50<i TEGUMENTARY ORGANS. perfect connective tissue occupying the centre of the papillae, and further distinguished by having their endoplasts and imperfect elastic Fig. A papilla with its Corpusculum tactus surrounded ly three vascular papilla. fibrils arranged transversely to the axis of the papilla, so that they appear to be made up of transverse superimposed laminge (Jig. 320.). One or two dark-contoured nerve tubules come up through the base of the papilla, and running along one side of the corpuscles, thin out and terminate, without, so far as I have been able to see, entering its substance. In fact, these nerve tubules are, as Kolliker pointed out, accompanied by a delicate neurilemma, and the axile corpuscle itself appears to me to be nothing more than the enlarged end of this neurilemma. In Birds, a large proportion of the tegumen- tary nerves terminate in bodies which are, on the one hand, related to these axile corpuscles, and on the other to the well-known Pacinian bodies {fig. 322). They are, in fact, usually described under the latter name; but their small size and superficial position, the paucity of their concentric lamellce, and the trans verse striation of the solid central axis, ally them closely with the corpuscula tactus. They are found in the skin around the sacs of the feathers, in the beak, and in the interosseus spaces of the fore- arm and leg. A special article (PACINIAN BODIES) has already been devoted to the organs of this kind which are met with in Mammalia, and it need only be added here, that late re- searches have shown that the Pacinian bo- dies of mammals, like those of birds, are solid masses of rudimentary connective tissue; the appearance of capsules and of a central cavity, arising merely from the arrangement of the elastic element and the extreme transpa- rency of the collagenous substance. * They are in fact nothing but thickened portions of the
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