File:Journal of morphology (1893) Branchiostoma.jpg

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Fig. 1. Four-cell stage from the apical pole. 1-1 = First plane of segmentation. 2-2—Second plane of segmentation. m.l.p.= Median longitudinal plane of future larva. Post. = posterior ; Ant. = Anterior.

Fig. 2. Eight-cell stage from the apical pole. a1, b1, c1, d1 the four apical micromeres derived from A, B, C, and D, respectively.

Fig. 3. Seventeen-cell stage from the vegetative pole. A, B, C, and D the four macromeres. a2, b2, c2, d2 the second generation of micromeres. d2 or X is the first somatoblast. x1 is derived from X as indicated by the position of the nuclei. The spindle in D later separates d<sup32 to the left.

Fig. 4. Vegetative pole of forty-six-cell stage. X, 2%" x1.1, x1.2, x2, x4= products of first somatoblast X. M — second somatoblast or mesoderm proteloblast, derived from D. Y=larval mesoblast, derived from a2, y1 and 2 are products of Y. A, B, C, D =Entomeres.

Fig. 5. Sagittal section of young gastrula. Bp.—blastopore; Ent.=entoderm; s.g.—cells of shell-gland; X= products of the first somatoblast X ; M = mesoderm teloblast of one side which has budded off one cell anteriorly. Y= larval mesoblast of one side.

Fig. 6. Sagittal section of an older stage. Ent.—entoderm; s. g.=shellgland; X, M, and Y as above. Oes.—first indications of oesophageal invagination.
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Source https://archive.org/details/journalofmorphol08wist/page/n642/mode/1up?view=theater Journal of morphology. Boston : Ginn & Co.
Author Wistar Institute of Anatomy and Biology

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current19:08, 22 March 2024Thumbnail for version as of 19:08, 22 March 20241,071 × 1,617 (1.44 MB)Rasbak (talk | contribs){{information |description=Fig. 1. Four-cell stage from the apical pole. 1-1 = First plane of segmentation. 2-2—Second plane of segmentation. m.l.p.= Median longitudinal plane of future larva. Post. = posterior ; Ant. = Anterior. Fig. 2. Eight-cell stage from the apical pole. a<sup>1</sup>, b<sup>1</sup>, c<sup>1</sup>, d<sup>1</sup> the four apical micromeres derived from A, B, C, and D, respectively. Fig. 3. Seventeen-cell stage from the vegetative pole. A, B, C, and D the four macromere...

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