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Intermediate Mesoderm Development - Anatomy & Physiology (view source)
Revision as of 14:17, 31 August 2008
, 14:17, 31 August 2008no edit summary
<big><center>[[Developmental Biology - Anatomy & Physiology|'''BACK TO DEVELOPMENTAL BIOLOGY]]</center></big>
<big><center>[[Developmental Biology - Anatomy & Physiology|'''BACK TO DEVELOPMENTAL BIOLOGY]]</center></big>
==Introduction==
The intermediate mesoderm exists as a strip of tissue between the lateral plate mesoderm and somites. It gives rise to the urinary system and some parts of the reproductive system. Kidney development includes three forms:
:Pronephros
:Mesonephros
:Metanephros
Mammals develop all three, and continue to use the metanephros in adult life. More primitive animals have only the first one or two.
==Pronephros==
*''The earliest kidney. Develops in the anterior of the animal (adjacent to somites 7 - 10). Eliminated in later development''.
#At intervals along the intermediate mesoderm, dorsal evaginations occur.
#Evaginations extend caudally and eventually fuse with more caudal evaginations.
#*The caudal - most evagination fuses with the cloaca.
#Forms a continuous excretory tube to the cloaca.
#Capillaries develop at the medial aspect of the intermediate mesoderm so that waste can diffuse from the blood to the excretory channel.
#Connections between the intermediate mesoderm and somites as well between the intermediate mesoderm and lateral plate mesoderm break down.