THE NERVOUS SYSTEM. 473 



are, perhaps, peculiar, because in these instances larger branches 



of the cutaneous nerves are, at their extremities, in connection 

 with numerous roundish vesicles, which might have the function 

 of nerve-cells ('Zeitsch. f. wiss. Zool./ vol. I, iii). 



In the integuments of the Mammalia and of Man, except 

 in the Pacinian bodies, until a short time since, no one had 

 seen anything of divisions in the nerve-tubes ; all observers 

 rather agreeing that terminal loops existed there, especially in 

 the papillae. But it now appears, from the researches of my- 

 self, J. N. Czermak, and C. Gegenbaur, that probably loops 

 and divisions, and occasionally even free terminations, all exist 

 in that situation. That in Man, terminal loops occur in the 

 papillae, and divisions in the terminal plexuses, I have already 

 mentioned; the latter are especially well shown in the conjunc- 

 tiva sclerotica, where free terminations also appear to exist, 

 and where peculiar convolutions of nerves (nerven-knauel), 

 similar to those formerly described by Gerber 1 (vide ' Mikrosk. 

 Anat./ II, i, p. 31, fig. 13 A, 3), present themselves. Czermak, 

 moreover, observed divisions of the cutaneous nerves in the 

 Mouse, and I myself a transition of the dark-bordered nerves 

 into pale anastomosing filaments, of O001 — O0005'", exactly 

 resembling the embryonic fibres in the Tadpole (' Mikrosk. 

 Anat./ II, i, p. 24) ; lastly, Gegenbaur has noticed numerous 

 divisions in the expansion of the nerves of the tactile hairs in 

 the Mammalia. Further experience will have to show in what 

 relative proportions the loops, divisions, and free terminations, 

 stand with respect to each other, and whether in the different 

 Mammalia, notwithstanding any apparent difference, some 

 correspondence obtains or not.] 



§ 122. 



Cerebral Nerves. — The sensitive and motor-nerve^ arising in 

 the hrain, correspond in most particulars so closely with tin' 

 spinal-nerves, that a short description of them will sullu-e; and 

 with respect to the higher nerves of sense, they will be after- 

 wards described, more fully, in connection with the organs to 

 which they belong. 



The motor cerebral-nerves, the third, fourth, sixth, seventh, 

 and twelfth pairs, with respect both to their roots and to their 



' [ General Anatomy,' translated by G. Gulliver, \>. 203, pi. 10, figs. 99, 100.— Ens.] 



