Book - Quain's Elements of Anatomy

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QUAIN'S

ELEMENTS OF ANATOMY



EDITED BY

WILLIAM SHARPEY, M.D, LL.D., F.R.S. L. & K,

EMERITUS PROFESSOR OF ANATOMY AND PHYSIOLOGY IN UNIVERSITY COLLEGE, LONDON

ALLEN THOMSON. M.D., LL.D., F.RS. L. & E,

PROFESSOR OF ANATOMY IN THE, UNIVERSITY OF GLASGOW

AND

EDWARD ALBERT SCHAFER

ASSISTANT PROFESSOR OF PHYSIOLOGY IN UNIVERSITY COLLEGE, LONDON


IN TWO VOLUMES.


ILLUSTRATED BY UPWARDS OF 950 ENGRAVINGS ON WOOD.


VOL. IL




NEW YORK WILLIAM WOOD AND CO., PUBLISHERS

27 GREAT JONES STREET 1878.

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Embryology or Development of the Foetus and its Organs

It is proposed to bring together in the present Section a short statement of the manner in which the parts of the body originate in the embryo, and acquire by development in the course of foetal life their complete form and structure. The collected facts bearing upon this subject constitute the department of anatomy known as Embryology, Embryological or Foetal Anatomy, or Foetal development, a knowledge of which is not only most interesting in itself, but is also of great importance for the elucidation of adult human anatomy and the whole science of Organic Morphology.

Although much attention has been given to the structure of the human foetus at different periods of its growth, yet the materials are still wanting for a detailed history of its early development ; accordingly it is necessary for further elucidation to have recourse to the information obtained by studying the process in animals. But this illustration from analogy is fully warranted by the general conformity in the plan of development which has been ascertained to prevail among the higher vertebrate animals, and by the agreement with this plan of the more important phenomena which it has been possible to observe in the human species. In what follows, therefore, while the main object will be to state the more important facts which have been ascertained as to the development of the human ovum and embryo, the history of the phenomena as they occur in birds and mammals will also be referred to in so far as it tends to throw light on human embryology.

1878 Elements of Anatomy: The Ovum | The Blastoderm | Fetal Membranes | Placenta | Musculoskeletal | Neural | Gastrointesinal | Respiratory | Cardiovascular | Urogenital

=Table of Contents

The Ovum : its Maturation, Fecundation, and Segmentation

Formation of the Blastoderm

The Mature Ovarian Ovum

Distinction of the Germ

Disappearance of the Germinal Vesicle

Fecundation

Segmentation of the Yolk

In the Mammal's Ovum

In the Bird's Ovum

The Blastoderm : its Structure and Relation to the Development of the Embryo

Position and Extent

Trilaminar Structure

Relation of the Layers to Development

Discovery of the Blastodermic Elements

Short Outline of the more General Phenomena of Development of the Ovum

Distinction of Embryonic and Peripheral Phenomena

Intra-Embryonic Phenomena of Development

Axial Rudiment of tlie Embryo

Cerebro-Spinal Axis

The Notochord

Protovertebrae

Pleural Cleavage of the Lateral Parts of the Mesoblast

Inllection of the Walls of the Body of the Embryo

The Cerebro-Spinal Nervous Centre

The Nerves

Organs of the Senses

Vascular System

Alimentary Canal

Reproductive and Urinary Organs

The Limbs

Extra-Embryonic Phenomena of Development

Foetal Membranes

The Yolk-Sac

The Amnion

The Allantois : Urinaiy Vesicle

The Chorion

Villi of the Chorion

Endochorion or Vascular Layer of the Allantois

Uteiiogestation : Placentation

Incapsulation of the Ovum in the Decidua

Earliest Observed Human Ova

Formation of Decidua

Structure of the Placenta

Circulation of Blood in the Placenta

Further Consideration of the Structure of the Placenta

General Conclusion

Separation at Birth and Eestoration of the Mucous Membrane of the Uterus

Development of Particular Organs and Systems

The Skeleton and Organs of Voluntary Motion

Vertebral Column and Trunk Segmentation of the Protovertebrae

Formation of Vertebral Matrices

The Head

The Cranium

The Cranial Flexures

Formation of the Mouth and

Hypophysis Cerebri

Subcranial, Facial, or Pharyngeal Plates or Arches

Eolations of Cranial Nerves

Origin and Formation of the Limbs

Development of the Muscles

Formation of the Joints

Development of the Organs OF the Nervous System

The Spinal Marrow

The Brain or Encephalon

General Phenomena of Development in Birds and Mammals

Fartlier Development of the Brain in Man and Mammals

Development of the Nerves

Development of the Eye

Development of the Nose

Development of the Alimentary Canal and Organs arising from the Hypoblast

Alimentary Canal

The Liver

The Pancreas

The Spleen, Lymphatic Glands, Thymus and Thyroid Glands

Development of the Lungs and Trachea Pleurae

Pulmonary Vessels

Development of the Heart and Blood-Vessels

Development of the Heart

Origin of the Heart

Division into single Auricle

Ventricle, and Arteria Bulb

Division of the Cavities

Ventricles

Division of the Auricles

Division of the Arterial Bulb

Formation of the Valves

Development of the Blood Vessels

The Principal Arteries : the Aorta

Aortic or Branchial Arches

Development of the Great Veins

Peculiarities of the Foetal Organs of Circulation

Course of the Blood in the Foetus

Changes in the Circulation at Birth

Development of the Genital and Urinary Organs

Primary Formation of the UroGenital System

Wolffian Bodies

First Origin of the Wolffian Bodies

Homologies of the Wolffian Body

The External Organs

Further History of the Developmentof the Uro-Genital Organs

The Urinary Bladder and Urachus

Genital Cord

Reproductive Organs

Reproductive Glands

The Testicle

The Ovary

The Genital Passages

The Female Passages

The Male Passages

The Descent of the Testicles

Type of Development and Abnormal Forms of the Genital Organs

Table of Corresponding Parts of Genito-Urinary Organs, and their Relation to Formative Rudiments