Alar plate : the part of mantle layer of neural tube

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Alar plate

 Definition :

The alar plates (or alar lamina) is a neural structure in the embryonic nervous system. Sensory area in the dorsal region of the spinal cord and brain

Development:

they develops from dorsal aspect of mantle layer of neural tube

Location :  

the dorsal region of the spinal cord and brain

Functional components deal by alar plate :

 general somatic afferent (collect touch, pain, pressure, vibration temperature  sensation from body wall ) and general visceral afferent(collect  pain, pressure  sensation from viscera )  .

Structures derived from alar plate :

1. dorsal gray matter of the spinal cord,

2. the sensory nuclei of cranial nerves V, VII, VIII, IX, and X.

3. The inferior olivary nucleus, mesencephalic nucleus of V, and main sensory nucleus of V are also developed from this plate.

4.  the rhombic lip of the alar plate develops the cerebellum, which is considered to be a big exception since alar plate gives rise to sensory derivatives only.