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derived from the somatopleure with a presumptive border of the ectamnion. Following the anterior extension of the extraembryonic mesoderm and formation of the coelom, the anterior and lateral amniotic folds arise along the ectamnion and grow posteriorly over the head of the embryo. A portion of the amniogenic somatopleure adjacent to the base of the head fold is identified as the region contributing to embryonic tissues in the thoracic wall and pharyngeal and cardiac regions. The somatopleure is known to serve as the matrix of the ventrolateral body wall and gives rise to connective tissue, tendons and the sternum.
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Entoderm. h, h. Rudiments of endothelial heart tubes. In III, IV, and V the scattered cells represented between the entoderm and splanchnic layer of mesoderm are the vasoformative cells which give origin in front, according to Bonnet, to the heart tubes, h; l.p. Lateral plate still undivided in I, II, and III; in IV and V split into somatic (sm) and splanchnic (sp) layers of mesoderm. mes. Mesoderm. p. Pericardium. so. Primitive segment.
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In chicken, the extraembryonic tissues are separated into two layers: the splanchnopleure composed of the endoderm and splanchnic mesoderm, and the somatopleure composed of the ectoderm and somatic mesoderm along with the formation of the coelomic cavity after gastrulation. The amnion and chorion are
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Transverse section through the region of the heart in a rabbit embryo of nine days. X 80. (Kölliker.) j, j. Jugular veins. ao. Aorta. ph. Pharynx. som. Somatopleure. bl. Proamnion. ect. Ectoderm. ent. Entoderm. p. Pericardium. spl. Splanchnopleure. ah. Outer wall of heart. ih. Endothelial lining of
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A series of a transverse sections through an embryo of the dog. (After Bonnet.) Section I is the most anterior. In V the neural plate is spread out nearly flat. The series shows the uprising of the neural folds to form the neural canal. a. Aortæ. c. Intermediate cell mass. ect. Ectoderm. ent.
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195:. The embryonic somatopleure is then divided into 3 sections, the anterior limb bud formation, the posterior limb bud formation and the non limb forming wall. The bud forming sections grow in size. The somatic mesoderm under the ectoderm proliferates in mesenchyme form.
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Asai, Rieko; Haneda, Yuka; Seya, Daiki; Arima, Yuichiro; Fukuda, Kimiko; Kurihara, Yukiko; Miyagawa-Tomita, Sachiko; Kurihara, Hiroki (2017-08-21).
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and the lateral body wall of the embryo. Limb formation, from the somatic mesoderm, is induced by
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splits into two layers. The outer (or somatic) layer becomes applied to the inner surface of the
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Knowledge articles incorporating text from the 20th edition of Gray's
Anatomy (1918)
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Christ, Bodo; Huang, Ruijin; Scaal, Martin (2007). "Amniote somite derivatives".
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The combination of ectoderm and mesoderm, or somatopleure, forms the
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Text was copied from this source, which is available under a
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Commons Attribution 4.0 International License
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396:Developmental Dynamics
170:lateral plate mesoderm
136:Anatomical terminology
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329:(1): 8955.
106:Identifiers
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890:Categories
760:Somitomere
647:Blastopore
611:Trilaminar
561:Blastocyst
556:Blastocoel
551:Cavitation
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462:Archived
459:Overview
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203:See also
174:ectoderm
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820:Anatomy
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451:at the
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331:Bibcode
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154:anatomy
152:In the
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
