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Somite Development - Anatomy & Physiology (view source)
Revision as of 13:56, 29 August 2008
, 13:56, 29 August 2008→Somite Maturation
*Somites differentiate to produce:
*Somites differentiate to produce:
:'''Scelerotome''' - develops into axial skeleton, ribs and vertebrae.
:'''Scelerotome''' - develops into axial skeleton, ribs and vertebrae.
:'''Dermomyotome''' - develops into myotome and dermotome.
:'''Dermomyotome''' - develops into ''myotome'' and ''dermotome''.
::'''Myotome''' - develops into skeletal muscle of the limbs and body.
::'''Myotome''' - develops into skeletal muscle of the limbs and body.
::'''Dermotome''' - develops into the dermis.
::'''Dermotome''' - develops into the dermis.
*Somites develop in an identical manner, although those at the posterior develop after those at the anterior.
*Somites develop in an identical manner, although those at the posterior develop after those at the anterior.
*The chick has 12 somites.
''Stages of somite maturation as observed along the anterior - posterior axis:''
===Somites I - III===
*These are the most newly formed somites, and are therefore at the posterior of the embryo.
*Somites are simple at this stage, with epithelial cells surrounding an inner cavity that is filled with mesenchymal pre - somitic mesoderm cells. These cells are called '''somitocoel cells'''.
*All cells are undergoing mitosis.
==Species Differences==
==Species Differences==