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
