Biol. Bull. Sign up for etocs!
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Biol Bull 159: 280-294. (October 1980)
© 1980 Marine Biological Laboratory
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by HOUK, M. S.
Right arrow Articles by HINEGARDNER, R. T.
Right arrow Search for Related Content
PubMed
Right arrow Articles by HOUK, M. S.
Right arrow Articles by HINEGARDNER, R. T.

THE FORMATION AND EARLY DIFFERENTIATION OF SEA URCHIN GONADS

MARGARET S. HOUK 1 and RALPH T. HINEGARDNER 1

1 Division of Natural Sciences, University of California, Santa Cruz, California 95064

1. The genital primordium gonads were examined at several stages during their development in the juvenile sea urchin.

2. At metamorphosis the primordial germ cells are a distinct group of cells in the dorsal mesentery, which also supports the stone canal and axial organs. They spread circumferentially along the aboral body wall to form a ring, the genital rachis, completely encircling the anal region. The gonads form as swellings in each interradius of this ring.

3. While the wall of the genitial primordium prior to rachis formation consists of a single layer of epithelial cells, that of the young gonad has two such layers separated by a fluid-filled space.

4. The primordial germs cells of each stage examined are similar in nuclear morphology, cytoplasmic inclusions, and cell shape and size. All stages have germ-cell-specific fibrillo-granular structures, which we name goniosomes.

5. A second cell type, the forerunner of the accessory cell of the mature gonad, is present in the genital tissue of all stages studied. Cellular inclusions characteristic of the accessory cell, including glycogen granules, lipid-like vesicles, and lysozymal-like vesicles, begin to accumulate in these cells even before gonad formation.




This article has been cited by other articles:


Home page
 Integr. Comp. Biol.Home page
C. G. M. Extavour
Gray anatomy: phylogenetic patterns of somatic gonad structures and reproductive strategies across the Bilateria
Integr. Comp. Biol., September 1, 2007; 47(3): 420 - 426.
[Abstract] [Full Text] [PDF]

Home page
 Biol. Bull.Home page
C. W. Walker, L. M. Harrington, M. P. Lesser, and W. R. Fagerberg
Nutritive Phagocyte Incubation Chambers Provide a Structural and Nutritive Microenvironment for Germ Cells of Strongylocentrotus droebachiensis, the Green Sea Urchin
Biol. Bull., August 1, 2005; 209(1): 31 - 48.
[Abstract] [Full Text] [PDF]

Home page
 ScienceHome page
E. Davidson, B. Hough-Evans, and R. Britten
Molecular biology of the sea urchin embryo
Science, July 2, 1982; 217(4554): 17 - 26.
[Abstract] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1980 by the Marine Biological Laboratory.