Peripheral and Autonomic Nervous System Flashcards
What is the PNS functionally divided into?
sensory and motor divisions
How many pairs of spinal nerves are there?
31
Where do the spinal nerve fibers exit?
through the foramen
How many pairs of cervical nerves are there?
8 C1-C8
How many pairs of thoracic nerves are there?
12
How many pairs of lumbar nerves are there?
5
How many pairs of sacral nerves are there?
5
how many pairs of coccygeal nerves are there?
only 1
What ways to nerve fibers travel through spinal cords?
in through the dorsal and out through the ventral
What does the dorsal root contain?
sensory fibers with cell bodies located in hte dorsal root ganglia
What does the ventral root contain?
motor fibers arising from the anterior gray column
What are the dorsal and ventral rami?
where the roots combine into one, forming a spinal nerve
What happens to the spinal nerve as it exits the foramen?
it divides into dorsal and ventral rami
-each rami now contains sensory and motor fibers, arranged in a segmental pattern