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Fig. 439. 1, 2 and 3, Schematic horizontal sections through human embryonic fore-brains at different stages of development

4, vertical section through fore-brain at about same stage as 1. Goldstein.

a, That part of the lateral ventricle lying between the corpus striatum and the junction of medial hemisphere wall and thalamus (leading into the inferior horn)

b, furrow or trough between mesial hemisphere wall and thalamus, produced by backward extension of hemisphere; c. /., internal capsule; P.M., foramen of Monro; &, external surface at junction of mesial hemisphere wall and thalamus; Str., corpus striatum; Th., thalamus; U, place where mesial hemisphere wall continues into the thalamus wall (junction of hemisphere wall and thalamus) ; U 1 , place where mesial hemisphere wall is continuous with lateral hemisphere wall.

In 1, owing to the thickening of U and growth of the corpus striatum, these two are brought into apposition, as indicated by the dotted lines on the right, and apparently fuse, obliterating a and producing the condition shown in 2 and 3.

In 2 and 3 the position of the former space a is indicated by the dotted lines a a' By comparison with 4, it will be seen that this obliteration by apparent fusion is actually produced by a filling up from the bottom of a (indicated faintly by dotted lines on the right in 4). The thickening of thfe walls at this region also produces a shallowing of b (indicated by dotted lines on the right in i). The principal cause of this general thickening is the passage of the fibers of the thalamic radiation to the hemispheres and, later, of fibers from hemisphere to pes, forming the internal capsule (4, 2 and 3).


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Pages where the terms "Historic" (textbooks, papers, people, recommendations) 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, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

Reference

Bailey FR. and Miller AM. Text-Book of Embryology (1921) New York: William Wood and Co.



Cite this page: Hill, M.A. (2024, March 28) Embryology Bailey439.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Bailey439.jpg

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