Spinal Nerves- Axons Extend From Lmn

Question 0

Spinal nerves are generally considered to be mixed because

Answer 0

The fibers (myelinated axons) run 2 ways

Question 1

31 pairs of spinal nerves

Answer 1

Left and right

Question 2

Sensory- in going messages

Answer 2

From muscle to sensory cortex

Question 3

Motor outgoing messages from

Answer 3

Motor cortex to muscle

Question 4

From spinal cord spinal nerve emerge/connect via 2 roots

Answer 4

Sensory=dorsal root–posterior afferent

And

Motor=ventral root– anterior efferent

Question 5

Cord (cns) to roots to nerves to RAMI

Answer 5

All pns

Question 6

The rami are sensory and motor

Answer 6

Ventral ramus of the spinal nerve serves front trunk and limbs
Dorsal ramus of the spinal nerve serve the back of trunk

Question 7

If both arms moving two sets of

Answer 7

Corticospinal tracts are firing, one in each side

Question 8

Sensory and motor rootlets join together where

Answer 8

Spinal nerve

Question 9

Where do motor fibers (efferent) of spinal nerves originate

Answer 9

In the grey matter or the h-shape

Of each level of the spinal cord (within)

Question 10

Motor fibers of spinal nerves originate at a

Answer 10

Group of cells called the anterior (ventral) horn cells aka alpha motor neuron

Question 11

At the alpha motor neuron the motor gives occur at

Answer 11

The point of connection(synapse!!) between the incoming motor fibers from the cns and the new alpha motor neuron in the spinal cord

Question 12

At the alpha motor neuron

Answer 12

It sends new motor fiber out to the pns, where it is called a nerve