Difference between revisions of "Intermediate Mesoderm Development - Anatomy & Physiology"
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− | + | <big><center>[[Developmental Biology - Anatomy & Physiology|'''BACK TO DEVELOPMENTAL BIOLOGY]]</center></big> | |
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==Introduction== | ==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: | 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: | ||
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==Pronephros== | ==Pronephros== | ||
− | *''The earliest kidney. Develops in the anterior of the animal (adjacent to somites | + | *''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. | #At intervals along the intermediate mesoderm, dorsal evaginations occur. | ||
#Evaginations extend caudally and eventually fuse with more caudal evaginations. | #Evaginations extend caudally and eventually fuse with more caudal evaginations. | ||
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#Capillaries develop at the medial aspect of the intermediate mesoderm so that waste can diffuse from the blood to the excretory channel. | #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. | #Connections between the intermediate mesoderm and somites as well between the intermediate mesoderm and lateral plate mesoderm break down. | ||
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Revision as of 14:17, 31 August 2008
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.