SPAUD 210: 3/27

1. oligodendrocytes (CNS)

2. Schwann cells (PNS)

what is the myelin sheath composed of in the central and peripheral nervous systems?

nodes of ranvier

unmyelinated sections of the axon

no

do reflexes involve the brain?

dorsal root

what channel does the sensory nervous system take?

ventral root

what channel does the motor nervous sytem take?

spinal reflex arc

what is the knee-jerk reflex also called?

1. spinal reflex arc (knee-jerk reflex)

2. withdrawal (flexor reflex/polysynaptic)

what are the two kinds of reflexes?

Withdrawal Reflex (flexor/polysynaptic reflex)

reflex where you use an extensor muscle, then feel something, then use the flexor muscle and turn off the extensor muscle

inhibitory interneuron

what turns off the extensor muscle for withdrawal

ganglion

a group of neurons (cell bodies) outside the CNS

nucleus

a group of neurons (cell bodies) within the CNS

nerve

a group of nerve fibers (axons) outside the CNS

tract

a group of nerve fibers (axons) within the CNS

white

what colors are nerves + tract

sensory ending

what do sensory neurons have that is sensitive to chemial and physical stimuli

interneurons

only in CNS, connect other neurons to each other

interneurons

neurons which produce a response - activate muscles/glands

upper motor neuron

nerve located entirely within the central nervous system

lower motor neuron

motor neuron in the peripheral nervous system with its nerve fiber extending out to the muscle and only its cell body in the central nervous system

tracts

groups of axons with a functional and anatomical unity (they're in the same place)

funiculi

anatomical division of a large column of white matter

1. dorsal funiculus

2. lateral funiculus

3. ventral funiculus

different types of funiliculus

tracts

within each column of funiculus, you have multiple _____