pain perception nBme - poojy36

[ArchivalUser]

which of the foll neural crest derivative is involved in congenital absence of pain perception?

a) larg ediameter neurons of dorsal root ganglia
b) small diameter neurons of dorsal root ganglia
c) postgang sympathetic
d) postgang para symp
e) schwann cells

[ArchivalUser]

b:?

[ArchivalUser]

It is B. Sensory Neurons for fast pain and slow pain are Type A delta and C, respectively. They are all small.

[ArchivalUser]

C ??
http://www.usmleforum.com/forum/message.php?id=66701

[ArchivalUser]

C and D are wrong. ANS is moter system, not sensory.

[ArchivalUser]

the answer is B
-large diameter mechanoreceptive neurons are born first in development
-small diameter nociceptive neurons are born later