Part 58

Fifth genus.—Remarkable obscurity of the motions. 190

III. Observations upon the Immoveable Articulations.

Situation, forms of each order.—Relation of the structure to the uses. 191

IV. Of the means of Union between the Articular Surfaces.

Union of the immoveable Articulations.—Cartilages of union. 193

Union of moveable articulations.—Ligaments and muscles considered as articular bands. 194

ARTICLE FIFTH.

DEVELOPMENT OF THE OSSEOUS SYSTEM.

Remarks. 195

I. State of the Osseous System during Growth.

Mucous State.—What should be understood by it. 195

Cartilaginous State.—Period and mode of its development.—Of this state in the broad bones. 197

Osseous State.—Its phenomena.—Its period. 198

Progress of the osseous state in the long bones; 1st, in the middle; 2d, in the extremities. 200

Progress of the osseous state in the broad bones.—Varieties according to the bones.—Formation of the ossa wormiana. ib.

Progress of the osseous state in the short bones. 202

II. State of the Osseous System after its Growth.

Increase in thickness.—Composition and decomposition after the termination of growth in thickness.—Experiments.—State of the bones in old age. 203

III. Peculiar Phenomena of the Development of the Callus.

1st. Fleshy granulations.—2d. Adhesions of these granulations.—3d. Exhalation of gelatine and then of phosphate of lime. 206

IV. Peculiar Phenomena of the Development of the Teeth.

Organization of the teeth.—Hard portion of the teeth.—Enamel.—Experiment which distinguishes it from bone.—Its thickness.—Its nature.—Reflections upon its organization.—Osseous portion.—Its form.—Cavity of the tooth. 209

Soft portion of the tooth.—Its spongy nature.—Its acute sensibility.—Remarks upon its different sympathies. 211

First dentition considered before cutting.—Follicle.—Membrane of this follicle analogous to the serous membranes.—Albuminous nature of the fluid which lubricates it.—Mode of development of the osseous tooth upon the follicle.—Number of the first teeth. 213

First dentition considered at the period of cutting.—Mode of cutting.—Accidents.—Their causes. 216

Second dentition considered before cutting.—Formation of the second follicle. 217

Second dentition considered at the period of cutting.—Fall of the first teeth.—Appearance of the second.

Phenomena subsequent to the cutting of the second teeth.—Growth in length and thickness.—Fall of the teeth earlier than the death of the bones.—Why.—State of the jaws after the fall of the teeth. 219