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*CIL – Cell Image Library accession number. Please use this to reference an image.

CIL:39785*  Cite 

Scanning electron microscope image of Strongylocentrotus drobachiensus [sea urchin] embryo at the late gastrula stage. Embryo was cut to reveal blastocoel cavity. The fertilization envelope dissolves during swimming blastula stage; therefore, the cilia and microvilli can be seen on the outer epithelial layer. The primary mesenchyme cells have formed a syncytial ring, which is the precursor to spicule formation(developing calcareous larval skeleton). A portion of the archenteron can also be seen. A high magnification view of a region of this image is available as CIL:39789. This image is part of a group of SEM images of sea urchin embryos at various stages of development. The group is available as CIL:39782-39791.

Technical Details

Images taken on a JEOL 35C SEM. Processing protocol: 1. 2% GTA in 75% MBL SW or FilteredSW FSW - fix for 1.5hrs. RT. 2. Rinse with 0.1M NaCacodylate buffer pH 7.4 3. 0.5% OSO4 in .075M NaCacodylate buffer pH 7.4 - 30' in the cold 4. Rinse in 0.1M NaCacodylate buffer ph 7.4 5. Dehydrate thru ETOH: 30%, 50%, 70%, 95% for 5 min each 6. 100% - 3 changes - 15' each 7. Critical Point Dry 8. Stick embryos down onto silver paint. Gently crack open with glass needle (pipette drawn out to a fine point). 9. Sputter coat with AuPd.

Biological Sources
NCBI Organism Classification
Lytechinus pictus
Cell Type
mesenchymal cell
Cellular Component
cell surface
Biological Context
Biological Process
embryonic morphogenesis
Louisa Howard
Dartmouth EM Facility
Digital Object Identifier (DOI)
Archival Resource Key (ARK)
Grouping This image is part of a group.
Sample Preparation
glutaraldehyde fixed tissue
ethanol dehydration
critical_point dried specimen
Relation To Intact Cell
whole mounted tissue
Spatial Axis Image Size Pixel Size
X 640px ——
Y 480px ——