This research was supported by NIH Grant AM 15972 and in part by DGF (SFB 146).
Anatomy and ultrastructure of the excretory system of the lizard, Sceloporus cyanogenys†
Article first published online: 6 FEB 2005
Copyright © 1976 Wiley-Liss, Inc.
Journal of Morphology
Volume 149, Issue 3, pages 279–326, July 1976
How to Cite
Davis, L. E., Schmidt-Nielsen, B., Stolte, H. and Bookman, L. M. (1976), Anatomy and ultrastructure of the excretory system of the lizard, Sceloporus cyanogenys. J. Morphol., 149: 279–326. doi: 10.1002/jmor.1051490302
- Issue published online: 6 FEB 2005
- Article first published online: 6 FEB 2005
The anatomy and ultrastructure of the lizard kidney (Sceloporus cyanogenys) have been studied by light and electron microscopy. The number of glomeruli was counted' in serial sections and estimated to be 2,000 (in the two kidneys). Beginning with the glomerulus and Bowman's capsule the nephron segments are sequentially: (a) proximal tubule; (b) intermediate ciliated segment consisting of a proximal and distal part; (c) distal tubule, which can be divided into two segments, followed by (d) connecting tubule and (e) initial collecting duct. The initial collecting ducts from several nephrons open into the collecting duct. Tubular epithelium in this lizard has similarities to that of other reptiles, The lateral borders do not overlap like in mammals, but interdigitate by fingerlike projections. The length of the nephron segments was measured in disected tubules and the diameter was measured on light and electron micrographs. From these measurements estimates of inner tubular surface area were made. Together with data from physiological studies (Stolte et al., '76; Schmidt-Nielsen, '76) the estimated surface area was used to calculate transport rates per unit area across the epithelium. Comparisons of structure and transport rates were made between S. cyanogenys and other reptiles and mammals.