Part 47

III. State of the Nervous System after Growth.

Phenomenon of puberty.—Phenomena of the following ages. 244

IV. State of the Nervous System in Old Age.

Its action is slight.—State of the brain at this period.—Influence of this state upon sensibility.—Phenomena of sensation and motion in old age. 244

NERVOUS SYSTEM OF ORGANIC LIFE.

GENERAL REMARKS.

How this system should be understood.—The great sympathetic does not exist.—Each ganglion forms an insulated system.—This system belongs to organic life.—It exhibits many irregularities.—The mode of describing it. 249

ARTICLE FIRST.

OF THE GANGLIONS.

I. Situation, Forms, Relations, &c.

Ganglions that are constant.—Those that are accidental. 253

II. Organization.

Colour.—Difference of the texture of the ganglions from that of the brain.—Comparative experiments.—This texture is not fibrous.—It differs essentially from that of the nerves.—Its organic lesions are rare.—Common parts of this texture. 255

III. Properties.

The ganglions have the organic ones.—The animal appear to be slightly marked in them.—Experiments.—Sympathies.—Nervous affections of the ganglions.—The kind of pain of this system.—General remarks. 260

IV. Development.

It does not follow that of the brain.—Influence of this fact upon the diseases of childhood.—Another difference between the ganglions and the brain. 263

V. Remarks upon the Vertebral Ganglions.

Their arrangement.—Obscurity which they throw upon the functions of this system. 264

ARTICLE SECOND.

OF THE NERVES OF ORGANIC LIFE.

I. Origin.

Manner of this origin.—Method of seeing it. 265

II. Course, Termination, Plexuses.

Of the branches which go to the cerebral nerves.—Of those which go to the neighbouring ganglions.—Of those which go the muscles.—Of those which form the plexuses.—Arrangement of these last.—Of the filaments which go from them.—Their double arrangement upon the arteries. 267

III. Structure, Properties, &c.

Analogy with the preceding nerves as to texture.—Animal sensibility appears to be less in them.—Experiments.—Sympathies of these nerves.—General remarks. 271

VASCULAR SYSTEM WITH RED BLOOD.