physio chapter 13

in which structure are sensory cell bodies located

10

damage to what structure would lead to paralysis of limbs

2

white ramus

Carries visceral motor fibers to sympathetic ganglion of autonomic nervous system

nerve plexus

Complex, interwoven networks of nerve fibers Formed from blended fibers of ventral rami of adjacent spinal nerves Control skeletal muscles of the neck and limbs

sympathetic ganglion

Ganglion receives preganglionic sympathetic fibers from T1 to L1-2 and innervates smooth muscle, cardiac muscle, glands, head, thoracic viscera, and blood vessels of the body wall and limbs.

the ----- innervates the ventrolateral body surface, structures in the body wall, and the limbs

anterior rami

anterior white commissure

area where axons cross from one side of spinal cord to the other

Endoneurium

innermost layer, surrounds individual axons

anterior white columns

lies between the anterior gray horns and the anterior median fissure

the white matter of the spinal cord is mainly

myelinated axons

if the posterior root of spinal nerves is severed

sensory input would be blocked

posterior horns

somatic and visceral SENSORY nuclei (incoming info from receptors)

anterior ramus

supplies most of body wall, skin, limbs

posterior ramus

supplies skin/muscles of back

sensory info form visceral organs is carried by the

sympathetic nerve

the posterior root ganglia mainly contain

synapses

the preganglionic fibers that connect a spinal nerve with an autonomic ganglion in the thoracic and lumbar region of the spinal cord and carries visceral motor fibers that are myelinated form the

white rami communicantes

gray commissures

-narrow bands of gray matter around central canal -axons cross here to the other side of spinal cord

all of the following are true of muscle spindles except they

are found in tendons

Spinal nerves are

both sensory and motor

Epineurium

outermost layer of connective tissue on the spinal nerve; a dense network of collagen fibers

spinal nerves

pair of spinal nerves emerges laterally from each spinal cord segment and formed by junction of anterior and posterior roots; all are mixed nerves

Arrange the spinal meninges from innermost layer to outermost layer.

pia mater, arachnoid mater, dura mater

ken has a herniated disc which is pinching the structure labeled 10. He is most likely experiencing impairment in which sensory pathway

somatic and visceral sensory

anterior horns

somatic motor nuclei (outgoing info to effectors)

a posterior and anterior root of each spinal segment unite to form a

spinal nerve

peripheral nerves

- Form from branching and re-sorting of spinal nerves - All are mixed nerves (sensory and motor) - Same connective tissue layers as spinal nerves (continuous with each other)

the anterior root of spinal nerves contain

axons of motor neurons

the posterior root of spinal nerves contain

axons of sensory neurons

posterior white column

between posterior gray horns and posterior median sulcus

lateral white column

between the anterior and posterior columns

descending tracts

carry motor commands to spinal cord

ascending tracts

carry sensory information to the brain

the postganglionic fibers that innervate glands in the body wall or smooth muscle are

gray rami communicantes

reflexes that activate muscles on the same side of the body as the stimulus are called

ispilateral

Perineurium

middle layer, divides nerve into fascicles (axon bundles)

lateral horns

thoracic and lumbar segments; visceral motor nuclei