Changes

*They differentiate once they reach their destination.

*They differentiate once they reach their destination.

*Other non - neural tissues also develop from the neural crest. The type of tissue that neural crest forms is dependant on the origination of the cell along the anterior - posterior axis:

*Other non - neural tissues also develop from the neural crest. The type of tissue that neural crest forms is dependant on the origination of the cell along the anterior - posterior axis:

::'''Anterior Neural Crest''' forms; sensory neurones and schwann cells; bones of the head; dermis of the face; and cartilage.

::'''Anterior Neural Crest''' forms; sensory neurones and [[Nervous System - PNS - Anatomy & Physiology#Schwann Cells|schwann cells]]; [[Bones and Cartilage - Anatomy & Physiology|bones]] of the head; dermis of the face; and [[Bones and Cartilage - Anatomy & Physiology|cartilage]].

::'''Trunk Neural Crest''' forms; sensory neurones of the somatic and autonomic nervous systems (ANS); sympathetic motor neurones of the ANS; melanocytes.

::'''Trunk Neural Crest''' forms; sensory neurones of the somatic and autonomic nervous systems (ANS); sympathetic motor neurones of the ANS; melanocytes.

::'''Posterior Neural Crest''' forms parasympathetic motor neurones of the gut, which control peristalsis.

::'''Posterior Neural Crest''' forms parasympathetic motor neurones of the [[Alimentary - Anatomy & Physiology#Small Intestine|gut]], which control peristalsis.

 

==Ectodermal Placodes==

==Ectodermal Placodes==