xcii Journal of Comparative Neurology. 



and sympathic, the former being excitory the latter antagonistic. 

 There is, however, an intrinsic plexus, so that the vagus and sympa- 

 thic are simply regulators. 



Forked Nerre Endings on Halrs.^ 



The authors have contributed a number of extended papers on 

 the nerve termini in the skin- and Mrs. Hoggan now collects data 

 from their combined labors. 



In 1872 Jobert discovered the coil about the hair follicle which 

 bears his name. Schon, in 1871, had found a medullated nerve pass- 

 ing to each hair follicle and forming a nerve ring about it and also de- 

 scribes a nerve coil below the bulb which is not reidentified by later 

 writers. Arnstein^ finds, in the mouse ear, a terminal nerve brush 

 subdividing in the skin about the follicle. 



Bonnet, in iS-j 8, (Morj)/i. ya/irl>i/c/i.) describes the tactile hairs 

 in various animals, and figures, in a vibrissa from the dog muzzle, a 

 large forked fibre. Richardi, in 1884, describes, in similar hairs of 

 the ox, medullated nerves passmg into non-medullated tortuous fibres 

 which again divide, forming ovoid or fusiform irregular nerve tufts 

 extending to about the middle of the follicle. 



Mrs. Hoggan states that Joberts' coils exist m all hairs and are 

 the most superficial of the nerve structures of the follicle and are 

 found just below the openings of the sebaceous glands, external to 

 the forked terminations, between them and the basement membrane. 

 These coils receive nerves horizontally from the side of the follicle, 

 and a connection was traced between some of these fibres and the 

 branched cells lying perpendicularly below them. 



The forked terminations lying between the lower layer of epider- 

 mic cells lining the follicle and the basement membrane are not very 

 easily seen on large vibrissse, but they are found on the smaller feel- 

 ers, where they show, as Bonnet has shown, a row of short, broad, 

 spade-like bodies, just above the end bulbs or the branched nerve 



1 Hoggan, G. and Mrs. F. F. E. Journal of Anatomy and Physiology 

 XXVn, 2, Jan., 1893. 



^ On some Cutaneous Nerve Terminations in Mammals. Linnean Soc.Journ. 

 XVI, 1893. I-^cs Formes nouvelles de Terminaisons nerveuses dans la Peau des 

 Mammiferes, XX, 1884. Neue Fornien von Endigungen in der Haul von 

 Saugethieren, 1884. New Forms of Nerve Terminations in Mammalian Skin. 

 Journ. Anat. Phys., XVIII, 1884. 



■^ Die Nerven der behaarten Haut. Sitzungsb. a. k. k. Akad., 1876. 



