Part 45

Influence of the cellular texture in the formation of tumours.—Cellular nature of all tumours which grow and increase.—Proofs.—Mode of development of these tumours.—How they differ from various engorgements, acute and chronic. 157

Influence of the cellular texture in the formation of cysts.—What is a cyst.—Its analogy with the serous surfaces.—Its cellular structure.—Mode of its development. 160

ARTICLE SIXTH.

DEVELOPMENT OF THE CELLULAR TEXTURE.

I. State of the Cellular System in the First Age.

Mucous mass represented by the cellular texture of the fœtus.—Superabundance of fluid.—This is then the cellular fluid.—Difficulty of emphysema in the fœtus.—State of the cellular texture in infancy and youth.—Its vital energy.—Consequences. 164

II. State of the Cellular System in the After Ages.

Arrangement of the cellular texture in the adult.—Differences arising from sex.—Degeneracy of this texture in old age.—Withering that it experiences.—Consequences. 167

NERVOUS SYSTEM OF ANIMAL LIFE.

Division of the nerves into two systems.—Differences of these two systems.—General arrangement of that of animal life.—Its symmetry.—Relation of size between the nerves and the brain. 169

ARTICLE FIRST.

EXTERNAL FORMS OF THE NERVOUS SYSTEM OF ANIMAL LIFE.

I. Origin of the Cerebral Nerves.

In what sense this origin must be understood.—It takes place, 1st, in the brain; 2d, in the tuber annulare and its dependancies; 3d, in the spinal marrow.—Manner of this triple origin.—Of the crossing of the nerves.—Phenomena of paralysis in regard to this.—Peculiar arrangement of the cerebral membranes at the origin of the nerves.—Extent, direction and form of the nerves at this origin. 171

II. Course of the Cerebral Nerves.

Communications of the cerebral nerves at their exit from their osseous cavity.—There are none between the nerves of the brain properly called.—The communications begin in those of the tuber annulare.—They are very numerous in those of the spinal marrow.—Arrangement of the plexuses which result from them.—Consequences as it regards descriptive neurology.

Internal communications of the nervous cords.—Manner of these communications.—Internal plexus to each nerve.—Consequences.—Difference from anastomoses.

Nervous Trunks.—Their course.—Their form.—Their length, &c.

Nervous branches, smaller branches, ramifications, &c.—Mode of origin.—Length.—Course, &c. 176

III. Termination of the Nerves.

What is to be understood by it.—Triple mode of termination.

Anastomoses with the same system.—What is to be understood by anastomoses.—They are rare in this system.—They can be referred to three classes.

Anastomoses with the system of organic life.—Termination in the organs.—Manner of this termination.—Division of the organs in this respect. 182

ARTICLE SECOND.

ORGANIZATION OF THE NERVOUS SYSTEM OF ANIMAL LIFE.

I. Texture peculiar to this Organization.

Arrangement of the nervous cords.—Their varieties.—Each nerve has its peculiar organization.—Of the structure of the nervous filaments.

Of the nervous coat and its origin.—How this origin may be seen.—Its triple arrangement at the brain, the tuber annulare and the spinal marrow.—Particular arrangement of the optic nerve.—Remarks upon the pia mater.—Course of the nervous coat. 185