File:Caldwell01.jpg

PLATE 29. Sections through Echidna and Phascolarctos

Black and white version of Plate 29.

Fig. 1. Echidna. - Small portion of a section through the ovarian ovum, measuring 0.32 mm. in diameter. 1st period : fe, follicular epithelium ; vm, vitelline membrane ; zr, zona radiata ; i/, yolk granules ; y.., white yolk ; o, oil globule ; b, basilar membrane.

Fig. 2. Echidna. - Small portion of a section through the ovarian ovum, measuring 1 mm. in diameter. 2nd period : lettering as in fig. 1.

Fig. 3. Echidna. - Small portion of a section through the nearly mature ovarian ovum. Beginning of 3rd period : lettering as in fig. 1.

Fig. 4. Echidna. - Small portion of a section through the ripe ovarian ovum, measuring 3 mm. in diameter. 3rd period : eh, pro-albumen.

Fig. 5. Phascolarctos cinereus. - Medium section through a nearly mature ovarian ovum taken from the " liquor folliculi" of a follicle measuring 9 mm. X 6 mm. : fe, follicular epithelium; vm, vitelline membrane ; gv, germinal vesicle.

Zeiss, oo. 2, obj.

Reference Letters

• alb = albumen.
• h = basilar membrane of follicular epithelium
• bl = posterior opening of blastopore.
• ch = pro-albumen.
• ep = epiblast.
• fe = follicular epithelium.
• gv = germinal vesicle.
• hy = hypoblast.
• o = oil (?) globule.
• n₁ = nucleus of smaller segmentation area.
• n₁ = nucleus of larger segmentation area.
• sh = shell membrane.
• sh₁= middle layer of shell membrane.
• sh₂= papillae of shell membrane.
• um = coagulum.
• vm = vitelline membrane.
• y₁ = yolk granules.
• y₂ = white yolk.
• y₃= yellow yolk.
• zr = zona radiata.

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Links: plate 31 bw | plate 31

Reference

Caldwell WH. The Embryology of Monotremata and Marsupialia Part I. (1887) Phil. Trans. Roy. Soc 178 B.

Cite this page: Hill, M.A. (2024, April 26) Embryology Caldwell01.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Caldwell01.jpg

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Historic Disclaimer - information about historic embryology pages

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)