Wikimedia Commons

File:Journal of morphology (1893) Branchiostoma.jpg

Original file ‎(1,071 × 1,617 pixels, file size: 1.44 MB, MIME type: image/jpeg)

Captions

Captions

Add a one-line explanation of what this file represents

Summary edit

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. 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.
Date
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

Licensing edit

Public domain

This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer.

You must also include a United States public domain tag to indicate why this work is in the public domain in the United States. Note that a few countries have copyright terms longer than 70 years: Mexico has 100 years, Jamaica has 95 years, Colombia has 80 years, and Guatemala and Samoa have 75 years. This image may not be in the public domain in these countries, which moreover do not implement the rule of the shorter term. Honduras has a general copyright term of 75 years, but it does implement the rule of the shorter term. Copyright may extend on works created by French who died for France in World War II (more information), Russians who served in the Eastern Front of World War II (known as the Great Patriotic War in Russia) and posthumously rehabilitated victims of Soviet repressions (more information).

This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.

This file, which was originally posted to an external website, has not yet been reviewed by an administrator or reviewer to confirm that the above license is valid. See Category:License review needed for further instructions.

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
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...

You cannot overwrite this file.

There are no pages that use this file.

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:Journal_of_morphology_(1893)_Branchiostoma.jpg&oldid=862753510"