scholarly journals Observations on the Composition of the Subcutaneous Fat of the White Leghorn Chick Embryo

1956 ◽  
Vol 35 (5) ◽  
pp. 1066-1069 ◽  
Author(s):  
Robert D. McGreal
Keyword(s):  
Chick Embryo ◽  
Subcutaneous Fat ◽  
White Leghorn ◽  
White Leghorn Chick

The Fine Structure of the Normal Chorio-Allantoic Membrane of the Chick-Embryo

1962 ◽  
Vol s3-103 (61) ◽  
pp. 17-23
Author(s):  
S.R. S. RANGAN ◽  
SATYAVATI M. SIRSAT
Keyword(s):  
Fine Structure ◽  
Chick Embryo ◽  
Potassium Permanganate ◽  
Osmium Tetroxide ◽  
Cell Membranes ◽  
Chick Embryos ◽  
White Leghorn ◽  
White Leghorn Chick ◽  
Lipid Inclusions ◽  
General Appearance

The chorio-allantoic membranes of White Leghorn chick embryos at 10 to 12 days after laying were fixed in Palade's buffered osmium tetroxide or in Luft's potassium permanganate. After fixation in these two ways the general appearance is similar, but there are differences in certain tissue elements. Cell membranes are well preserved after fixation in KMnCv Certain lipid inclusions in the cytoplasm of the cells of the allantoic layer are well seen after fixation by OsO4, but not after KMnO4; in their places empty vacuoles are seen. Details of the structure of the red blood-corpuscles are more clearly seen after fixation in KMnO4.

The mitotic pattern of the embryonic epidermis of chick during scale morphogenesis

Development ◽  
1969 ◽  
Vol 21 (2) ◽  
pp. 235-242
Author(s):  
Takesi Yohro
Keyword(s):  
Chick Embryo ◽  
Experimental Studies ◽  
Gross Anatomy ◽  
Epidermal Cells ◽  
Mitotic Count ◽  
Proliferation Rate ◽  
In Vitro Studies ◽  
White Leghorn ◽  
Developmental Problems

The epidermis of the chick embryo has been widely used for in vitro studies of many developmental problems (Matoltsy, 1960; Billingham & Silvers, 1963). The present attempt to determine the proliferation rate of chick embryonic epidermal cells was expected to provide a base for experimental studies, but a preliminary mitotic count revealed that the number of mitoses varied greatly in different areas. This suggested accumulation of mitoses in some restricted parts of the epidermis, and so a mapping experiment was carried out to determine the distribution of mitoses in this material. The characteristic mitotic pattern which was discovered is described and discussed. About 300 White Leghorn embryos were used: 20 for study of the gross anatomy of scales, 200 for Colcemid treatment and 80 for [3H] thymidine treatment.

scholarly journals The Lipid Content of the Subcutaneous Fat Organs of the Chick Embryo

1962 ◽  
Vol 41 (4) ◽  
pp. 1232-1240 ◽  
Author(s):  
G.L. Feldman ◽  
L.M. Churchwell ◽  
T.W. Culp ◽  
F.A. Doyle ◽  
H.T. Jonsson
Keyword(s):  
Chick Embryo ◽  
Lipid Content ◽  
Subcutaneous Fat

Neuroectodermal origin of avian hypothalamo-hypophyseal complex: the role of the ventral neural ridge

Development ◽  
1975 ◽  
Vol 34 (2) ◽  
pp. 311-325
Author(s):  
T. Takor Takor ◽  
A. G. E. Pearse
Keyword(s):  
The Other ◽  
Avian Embryo ◽  
Chick Embryos ◽  
White Leghorn ◽  
Optic Chiasma ◽  
Somite Stage ◽  
White Leghorn Chick ◽  
Caudal Portion ◽  
Neuroectodermal Origin

Embryonic discs from White Leghorn chick embryos (presomite to 12-somite stages) were examined in serial transverse and longitudinal sections. Later stages, up to 21 days, were also examined. The following observations were made: (1) Lateral folding rather than head folding is the mechanism by which the avian embryo is delimited. The process takes place at two terminal points, one cephalic the other caudal. (2) Thickening of the ventral ectoderm around the tip of the presumptive anterior neuropore, beginning at the 4-somite stage, subsequently extends the dorsal neural ridge to form a ventral neural ridge. (3) The cephalic portion of the ventral neural ridge, extending from anterior neuropore to optic chiasma, is mainly incorporated into the alar plates of the diencephalon. (4) The caudal portion, extending from optic chiasma to the stomodeum, gives rise to Rathke's pouch and thus to the adenohypophysis. We conclude that the latter is to be regarded as of neuroectodermal rather than ectodermal (stomodeal) origin, and that some or all of the neuroendocrine nuclei of the hypothalamus are similarly derived from the neuroectoderm of the neural ridge. The hypothalamo-hypophyseal complex is thus to be regarded as a single rather than a composite entity.

A detailed paraxial schematic eye for the White Leghorn chick

2010 ◽  
Vol 196 (11) ◽  
pp. 825-840 ◽  
Author(s):  
Natalia V. Avila ◽  
Sally A. McFadden
Keyword(s):  
White Leghorn ◽  
White Leghorn Chick ◽  
Schematic Eye
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