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Functional morphology of venous structures associated with the male and female reproductive systems in Florida manatees (Trichechus manatus latirostris)†
Article first published online: 30 OCT 2001
Published 2001 Wiley-Liss, Inc.
The Anatomical Record
Volume 264, Issue 4, pages 339–347, 1 December 2001
How to Cite
Rommel, S. A., Pabst, D. A. and McLellan, W. A. (2001), Functional morphology of venous structures associated with the male and female reproductive systems in Florida manatees (Trichechus manatus latirostris). Anat. Rec., 264: 339–347. doi: 10.1002/ar.10022
This article is a US Government work and, as such, is in the public domain in the United States of America.
- Issue published online: 30 OCT 2001
- Article first published online: 30 OCT 2001
- Manuscript Accepted: 25 AUG 2001
- Manuscript Received: 31 JAN 2001
- thermo- regulation
The reproductive organs of Florida manatees (Trichechus manatus latirostris) are surrounded by thermogenic locomotory muscles and insulating fat. Manatees are reported to maintain core body temperatures of 35.6°–36.4° C, temperatures known to interfere with production and maturation of viable sperm in terrestrial mammals. We describe two novel venous plexuses associated with the manatee epididymis. Each epididymis is located in a hypogastric fossa at the caudolateral extremity of the abdominal cavity. Each hypogastric fossa is lined by an inguinal venous plexus that receives cooled blood from a superficial thoracocaudal plexus. We conclude that male manatees may prevent hyperthermic insult to their reproductive tissues by feeding cooled superficial blood to venous plexuses deep within their bodies. Female manatees also possess hypogastric fossae and venous structures similar to those found in male manatees. The ovaries, uterine tubes, and distal tips of the uterine horns are located in the hypogastric fossae. We suggest that the thermovascular structures we describe also prevent hypothermic insult to female manatee reproductive tissues. The venous structures in manatees are functionally similar to structures associated with reproductive thermoregulation in cetaceans and phocid seals. Thus, these thermovascular structures appear to be convergent morphological adaptations that occur in three clades of diving mammals with independent evolutionary histories. Anat Rec 264:339–347, 2001. Published 2001 Wiley-Liss, Inc.