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Blastocyst - 2.png

Descriptive figure legend goes here. Panel A is… Panel B is… Panel C is…[citation needed]
Blastocyst English.svg

Schematic diagram showing the blastocyst, with its embryoblast (inner cell mass) and its trophoblast layer, alongside the surface of the endometrium.[citation needed]
Carnegie stage 3
Days 5
Precursor morula[citation needed]
Gives rise to gastrula,[citation needed]
primitive yolk sac[citation needed]
Anatomical terminology

A blastocoel (alt. spelling blastocoele, blastocele),[1] also termed the blastocyst cavity[2][better source needed] (or cleavage or segmentation cavity[1]) is the name given to the fluid-filled cavity of the blastula (blastocyst) that results from cleavage of the oocyte (ovum) after fertilization.[1][2] It forms during embryogenesis,[citation needed] as what has been termed a "Third Stage" after the single-celled fertilized oocyte (zygote, ovum[citation needed]) has divided into 16-32 cells,[2] via the process of mitosis.[citation needed] It can be described as the first cell cavity formed as the embryo enlarges,[citation needed] the essential precursor for the differentiated, topologically distinct, gastrula.[citation needed] The adjectival form of blastocoel is blastocoelic.[1]


  1. ^ a b c d Dorlands Staff (2004). "blastocoele [dictionary entry]". Dorland's Illustrated Medical Dictionary (online). Amsterdam, NDE: Elsevier-Saunders. Retrieved 30 January 2016. blastocoele… [blasto- + -coele] the fluid-filled cavity of the mass of cells (blastula) produced by cleavage of a fertilized ovum. Sometimes spelled… [c]alled… [Also] blastocoelic… pertaining to the blastocoele. 
  2. ^ a b c Senn, A.; Schöni-Affolter, F.; Dubuis-Grieder, C. & Strauch, E.; et al. (2007). "Module 8, Embryonic Phase; [Section] 8.1 The Carnegie Stages; Synoptic Table of the Carnegie Stages 1 - 6; [page] 'Stage 3, Approx. 4th - 5th day, 0.1 - 0.2 mm' [rev. 25.04.07]". In Manuèle Adé-Damilano. Online Course in Embryology for Medicine Students. Fribourg, CHE: Swiss Virtual Campus, l'Université de Fribourg, et al. Retrieved 30 January 2016. Drs Senn and Dubuis-Grieder are at l'Université Lausanne, Drs Adé-Damilano and Schöni-Affolter at l'Université de Fribourg, and Dr Strauch at Universität Bern. 

See also[edit]