File:Thyng1914 plate4b.jpg

Plate 4

Reconstruction to show the right atrium and ventricle of the heart; the venous system of the right side; and the left umbilical vein of a 17.8 human embryo (H. E. C. 8.39). X 11.2 diams.

Oral cavity

• The primitive oral cavity appears in median sagittal section in plate 1, but is represented more fully in plate 4, a portion of the tongue having been cut away.
• Process of the right maxillary arch is clearly shown in plate 4 where a portion of the tongue has been removed.
• Hypophysis (Hyp.), alluded to above, consists of a distal spade-like portion, connected to the oral epithelium in the median line by a slender stalk with reduced lumen. It is represented in side view in plate 4.

Liver - The position of the quadrate lobe can be determined from plate 2. It is situated to the right of the vesica fellea (Ves.fel.), lying between this and the umbilical vein (V.um.s., plate 4).

Adrenal - The right suprarenal is shown in plate 4. It seems very probable to the author that each of these main groups of cells has been partially isolated from the suprarenal gland of its side by the development of the large dorso-ventral segment of the supra-ureteral venous channel (plate 4) which now intervenes between them.

Spleen - is clearly recognizable as a small, protuberance of the mesogastrium, containing dense m.esenchyma. The tissue directly ventral to this protuberance, is permeated by a vascular network, supplied by the splenic artery, and drained by the splenic vein (V.li., plate 4).

Embryo 17.8 mm Links: Fig 1 | Fig 2 | Plate 1a | Plate 1b | Plate 2a | Plate 2b | Plate 3a | Plate 3b | Plate 4a | Plate 4b | Plate 5a | Plate 5b | Plate 6 | Harvard Collection | Carnegie stage 19

Reference

Thyng FW. The anatomy of a 17.8 mm human embryo. (1914) Amer. J Anat. 17: 31-112.

Cite this page: Hill, M.A. (2024, June 23) Embryology Thyng1914 plate4b.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Thyng1914_plate4b.jpg

What Links Here?

© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G