THE STRUCTURE OF THE ELEMENTARY TISSUES. 



103 



known as inter-epithelial arborizations; 2, by motor-plates which lie in 

 the muscles; 3, by special end-organs, connected with the senses of 

 sight, hearing, smell, and taste; and, 4, by various forms of tactile 

 corpuscles. 



1. The inter-epithelial arborizations form a most common mode 

 of termination of the sensory nerves of the body. The nerve-fibres pass 

 to the surface of the skin or mucous membrane; they then lose their neu- 



Fig. 106. Sensory nerve terminations in stratified pavement epithelium. (After G. Ret- 

 ziusO Golgi's rapid method. 



rilemrna and myeline sheath, the bare axis-cylinder divides and subdi- 

 vides into minute ramifications which pass among the epithelial cells 

 of the skin and mucous membrane. In the various glands of the body 

 this form of termination also prevails. The hair-bulbs, the teeth, and 

 the tendons of the body are supplied by this same process of terminal 

 arborization (figs. 106, 107). 



2. The motor-nerves passing to the muscles end in what are known 



Fig. 107. Sensory nerve terminations in the epithelium of the mucosa of the inferior vocal 

 cord and in the ciliated epithelium of the subglottic region of the larynx of a cat four weeks old. 

 (After G. Retzius. ) Golgi's rapid method, n, Nerve-fibres rising from the connective-tissue layer 

 into the epithelial layer, where they terminate in ramified and free arborizations. 



as muscle-plates, the details of whose structure have been already de- 

 scribed. 



3. The special sensory end-organs will be described later in the 

 chapter on the Special Senses. 



4. A fourth form of termination consists of corpuscles that are more 

 or less encapsulated, and these are known as the corpuscles of P acini, the 

 tactile corpuscles of Meissner, the tactile corpuscles of Krauze, the tactile 

 menisques and the corpuscles of Golgi. 



