Atlas of the Development of Man 1 - Part 1

From Embryology
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Historic Textbook - Atlas of the Development of Man Volume 1 (1907)

(Handatlas der entwicklungsgeschichte des menschen: Volume 1)
Kollmann Atlas 1: Predevelopment | Ontogeny | Fetal membranes | Body shape | Systems and organs | Kollmann Atlas 1 | Kollmann Atlas 2 | Julius Kollmann
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Pages where the terms "Historic Textbook" and "Historic Embryology" appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms and interpretations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)
This text is a Google translate computer generated translation and may contain many errors.

Predevelopment

Kollmann Atlas 1: Predevelopment | Ontogeny | Fetal membranes | Body shape | Systems and organs | Kollmann Atlas 1 | Kollmann Atlas 2 | Julius Kollmann

I. The egg

The egg is one cell organized for the preservation of the species.

Every living being develops from a seed, in the vast number of animals and plants is a simple cell. Even the ride of the human female egg it one of the Plierstock to cell uncoupling. Everyone knows that the chicken develops from an egg, that fish and frogs from the spawn and the frog eggs emerge, but not generally known is that these eggs have the same value as mammalian cells and that man arises from the same grand cells. In order to accept a certain number of changes their shape. so closely related to the starting point, and yet the goal of each different forms of development indefinitely.


The egg comes from the human Graafian follicle the egg pieces. The eggs of mammals is a sphere of about 2mm size. The egg has the following structure:

A soft cover, 14 micron thick, the egg membrane, zona pellucida, they enclose:

  1. The yolk, Vitellus, in the same
  2. The germinal vesicle, vesicula germinativa, 37 micron size
  3. the germinal spot. Germinativa macula.

The figure below is a human egg from the ovary. Comes from such a small egg, the whole nature of man, in all material and immaterial qualities forth. It has no resemblance to the skilled nature. Even the strongest magnification show absolutely nothing on the later form might suggest.


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Fig. 1. Human egg from a mature follicle

When the microscopic examination of this structure was still imperfect it was believed that it contained extreme healing not only in this and all organs, but also all descendants. But none of all that can yet be seen. This theory was the theory of evolution, also called preformation (Leibnitz, II, of all others).

The yolk consists of a finely granular mass of protoplasm which is arranged in rambling, irregular lines. Today a somewhat differently constituted intervening, lighter substance. Protoplasm [nQäitm first, nkdo / tia formation) it is a mixture of organized matter of testing and liquid components with chemical and physical properties of a special nature and animated. These properties also shared by the No, which occurs in the cells. No life without protoplasm. Fine granules, microsomes, are now scarce, sometimes abundant, depending upon the nature and properties of the protoplasm. Their distribution is almost evenly, sometimes unevenly, they are dyed or undyed. Their distribution varies according to the different forms. Obtained with the development the cells in the different tissues and protoplasm so function.

The germinal vesicle at first sight is like a bright, spherical space in the interior of the yolk: it is not the same are found granular "features, which extend from the edge of the germinal spot, the nuclear framework. Between these tracks it detected a lighter substance, the nuclear sap. The core structure is stained and is called chromatic substance of the unstained, differentiated achromatic

1). The germinal vesicle of the mature egg has a boundary layer, which surrounds its mass and may, like the eggs of mammals is so strong that it resists a gentle push.

II. maturation the egg

No egg from the ovary is, after today's experience, useful for fertilization if it also has all the qualities a normal size, yolk, germinal vesicle and germinal spot. In short, before it leaves the ovary, or soon after, the old germinal vesicle must be changed completely, and a considerable portion of his Lose substance. The transformation is so much it seems, an exception prevailing rule. The process of transformation is as maturation of the egg called the germinal vesicle moves from here the center of the yolk, gradually rising to the surface seems to shrink, then disappear, the membrane of the germinal vesicle, this itself is unclear and appears in the yolk only as an irregular bright spot in its vicinity Yolk radially arranged fine lines occur separated from this bright spot successively under the distinct character a true mitotic cell division only one (Fig. 4). then a second bright spots out. Each of these retiring masses moves to the surface of the yolk, and follow the same hilly, rising (Fig. 8).

III. Fertilization

VI. Site of fertilisation

a) Place of fertilization and pregnancy theories

b) durability and resistance of the spermatozoa

c) ovulation

d) Detachment of the egg from the ovary, and the walk through the tubes


This text is a Google translate computer generated translation and may contain many errors.

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Cite this page: Hill, M.A. 2017 Embryology Atlas of the Development of Man 1 - Part 1. Retrieved October 22, 2017, from https://embryology.med.unsw.edu.au/embryology/index.php/Atlas_of_the_Development_of_Man_1_-_Part_1

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© Dr Mark Hill 2017, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G