A treatise on human physiology / By John C. Dalton, jr.

  • Dalton, John Call, 1825-1889.
Date:
1859
Catalogue details

Licence: Public Domain Mark

Credit: A treatise on human physiology / By John C. Dalton, jr. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    CHAPTER VII. ON THE DEVELOPMENT OF THE IMPREGNATED EGG. PAGE Segmentation of the vitellus—Formation of blastodermic membrane.—Two layers of blastodermic membrane—Thickening of external layer—Formation of primitive trace—Dorsal plates—Abdominal plates—Closure of dorsal and abdominal plates on the median line—Formation of intestine—Of mouth and anus—Of organs of locomotion—Continued development of organs, after leaving the egg ....... 488-497 CHAPTER YIII. THE UMBILICAL VESICLE. Separation of vitelline sac into two cavities—Closure of abdominal walls, and formation of umbilical vesicle in fish—Mode of its disappearance after hatch- ing—Umbilical vesicle in human embryo—Formation and growth of pedicle —Disappearance of umbilical vesicle during embryonic life . . 498-500 CHAPTER IX. AMNION AND ALLANTOIS—DEVELOPMENT OF THE CHICK. Necessity for accessory organs in the development of birds and quadrupeds— Formation of amniotic folds—Their union and adhesion—Growth of allantois from lower part of intestine—Its vascularity—Allantois in the egg of the fowl—Respiration of the egg—Absorption of calcareous matter from the shell — Ossification of skeleton — Fracture of egg-shell — Casting off of amnion and allantois . . . . . . . 501-509 C HAPTER X. DEVELOPMENT OF THE EGG IN THE HUMAN SPECIES—FORMATION OF THE CHORION. Conversion of allantois into chorion—Subsequent changes of the chorion— Its villosities—Formation of bloodvessels in villosities—Action of villi of chorion in providing for nutrition of foetus—Proofs that the chorion is formed from the allantois—Partial disappearance of villosities of chorion, and changes in its external surface . ..... 510-515 CHAPTER XI. DEVELOPMENT OF UTERINE MUCOUS MEMBRANE—FORMATION OF THE DECIDUA. Structure of uterine mucous membrane—Uterine tubules—Thickening of uterine mucous membrane after impregnation—Decidua vera—Entrance of egg into uterus—Decidua reflexa—Inclosure of egg by decidua reflexa— Union of chorion with decidua—Changes in the relative development of dif- ferent portions of chorion and decidua ..... 516-522