LECTURE XII.
MARCH 31, 1858.
THE NERVOUS SYSTEM.
Peripheral terminations of the nerves — Nerves of special sense — The skin and the distinction of vessel-, nerve-, and cell-territories in it — Olfactory mucous membrane — Retina — Division of nerve-fibres — The electrical organ of fishes — Muscles — Further consideration of nerve-territories — Norvous plexuses with ganglioniform enlargements — Intestines — Errors of the neuro-pathologists. The great nervous centres — Grey substance — Ganglion- [nerve-] cells containing pigment — Varieties of ganglion-cells ; sympathetic cells in the spinal marrow and brain, motor and sensitive cells. Multipolar (polyclonous) ganglion-cells — Different nature of the processes of ganglion-cells.
I return, gentlemen, to-day once more to the skin. The difference which exists between the individual papillae of the skin seems to me so important theoretically, that I think I must claim your special attention to it. In the greater number of the papillae we see, as I mentioned to you the last time, a single or, when the papilla is very large, a branched, vascular loop. The majority of these vascular papillae have no nerves; others again which contain tactile bodies, no vessels. If we imagine the vessels and tactile bodies removed, there remains only a very small quantity of substance in the papilla, but within it there still are morphological elements, and it is easy to convince oneself that connective tissue with its corpuscles (which latter after injection are very easily distin-
