Abstract:
:The cloacal complex of Crocodylus porosus is composed of three chambers (proctodaeum, urodaeum, and coprodaeum) separated by tight, muscular sphincters. The proctodaeum is proximal to the cloacal vent and houses the genitalia. The urodaeum is the largest chamber, is capable of storing large quantities of urine, and is lined with an epithelium with the capacity for transepithelial water and ion exchange. The coprodaeum, the most orad cloacal chamber, is a small, only marginally expandable chamber that has an epithelium composed almost entirely of mucus-secreting cells. The coprodaeum and lower intestine are reported to be the site(s) for urine modification in birds and bladderless lizards. A radiographic trace of urine storage in C. porosus kept for 2 months under hyperosmotic conditions showed no signs of retrograde movement of urine into the coprodaeum or rectum. Instead, urine was stored in the urodaeum of C. porosus. Examination of the mucosal surface of the urodaeum by SEM showed a plastic response to environmental salinity, with a possible increase in surface area in animals kept in hyperosmotic water compared with animals from fresh water. We propose the urodaeum as the primary site for postrenal modification of urine in C. porosus.
journal_name
J Morpholjournal_title
Journal of morphologyauthors
Kuchel LJ,Franklin CEdoi
10.1002/1097-4687(200008)245:2<168::AID-JMOR7>3.0.keywords:
subject
Has Abstractpub_date
2000-08-01 00:00:00pages
168-76issue
2eissn
0362-2525issn
1097-4687pii
10.1002/1097-4687(200008)245:2<168::AID-JMOR7>3.0.journal_volume
245pub_type
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