Related Experiment Video
Updated: Feb 8, 2026

Clinical Application of 24 G Cannula Needle and 3-0 Polypropylene Suture in Vas Deferens Exploration
Published on: February 10, 2023
Ultrastructure and role of the lobster vas deferens in spermatophore formation: The proximal segment
1Department of Biology, University of California, Riverside, California 92521.
Abstract:
We have examined the anatomy of the vas deferens of the lobster Homarus americanus and have described the structure of the proximal vas deferens (segments one and two). The two tubes of segment one descend from the testes and gradually merge into segment two. The epithelium of segment one has synthetic activity and appears to contribute to the sperm-supporting matrix by exocytotic release of granules through its apical surface. The epithelium of segment two is also highly synthetic and secretes the primary spermatophore layer and part of the intermediate layer that surround the sperm mass. The trifoil shape of the extruded spermatophore is established through a change in height of some of the cells lining the lumen in segment two. Connective tissue and circular bands of striated muscle surround the epithelium of both segments.
Related Concept Videos
Relationship Formation
Factors Influencing Attraction I: Proximity
Formation of Species
Role of Septins
Cellular Functions of Septins
Recent studies have revealed the multifaceted roles of septins in various cellular processes such as cytokinesis, ciliogenesis, and neurogenesis. Septins act as scaffolds and...
Filtration and Urine Formation
Solution Formation
This selective...

