chapter 10 Flashcards
function of myelination of the axon
insulates the axon
subdivisions of nervous system composed of
central nervous system, peripheral nervous system, and autonomic nervous system
central nervous system contains
brain and spinal cord
peripheral nervous system contains
all nerves extended from brain and spinal cord, spinal and cranial nerves
multiple sclerosis (MS) is
myelin loss in central nerve fiber causes conduction impairment and autoimmune disorder
CSF
cerebrospinal fluid; subarachnoid spaces of meninges, central canal inside cord, ventricles in brain
what takes place during nerve impulse
electrical charges travel along membrane of the cell; communicate information to the body
what is saltatory conduction
when electrical impulses skip from node to node down full axon
where does saltatory conduction take place
myelinated nerve fiber
what neurotransmitter is deficient in Parkinson’s disease
dopamine
parts of brainstem
medulla oblongata, pons, and midbrain
medulla oblongata in brainstem
lowest part of brainstem
pons in brainstem
above the medulla, formes bridge to narrower midbrain
midbrain in brainstem
above the pons
what is an interneuron
conducts impulses from sensory neurons to motor neurons
different types of neuralgia
astrocytes, microalgia, oligodendrocytes
trigeminal neuralgia is
compression of 5th cranial nerve(trigeminal nerve) reoccuring episodes of stabbing pain
Bell Palsy is
compression of 7th cranial nerve (facial) paralysis of some or all facial features
Herpes/ Shingles is
viral infection caused by chickenpox virus that has invaded the dorsal root ganglion, can infect eye
parts of a neuron
dendrites, axon, cell body or soma *look at picture
sensory nerve impulse
sensory receptors in skin detect pain or change in temp, they transmit an impulse which reaches the brain
motor nerve impulse
sends impulses to a muscle or gland and muscle or gland reacts in response
different layers of meninges
dura mater, pia mater, arachnoid mater
dura mater
tough outer layer lines in vertebral canal
pia mater
innermost membrane covering spinal cord
arachnoid mater
membrane between dura and pia mater
dermatone
skin surface area supplied by a single cranial or spinal nerve
space between presynaptic and postsynaptic neuron
synapse
sympathetic nervous system
prepares body for the “fight or flight” response during potential danger
parasympathetic nervous system
inhibits the body from overworking and restores the body to a calm and composed state
3 cranial nerves for eye movement
oculomotor, trochlear, abducens
what forms a 2 layer structure called blood- brain barrier
astrocytes
glia`
support and protect nerve cells; do not transmit impulses
astrocytes
star shaped cells that anchor small blood vessels to neurons
microlgia
smaller cells that are usually stationary; perform phagocytosis if brain tissue becomes inflamed
oligodendrocytes
helps hold nerve fibers together
schwann cells
the glia cells that form myelin sheath around axons in (PNS)
blood brain barrier (BBB)
allows water, oxygen, carbon dioxide, and few other substances such as alcohol to move between blood and tissue of brain
endoneurium
surrounds individual axons
perineurium
surrounds a group of or fascicle of nerve fibers
epineurium
surrounds entire nerve
continuous conduction
nerve impulse moving through unmyelinated nerve fiber
synapse
place where impulses are transmitted from one neuron to another
divisions of the brain
brainstem, cerebellum, diencephalon, cerebrum
sensory tracts
conduct impulses from brainstem up to higher parts of the brain
motor tracts
conduct impulses from higher parts of the brain down to spinal cord
brainstem (medulla oblongata, pons, midbrain) control
heartbeat, respirations, and blood vessel diameter
Cerebellum function
produces smooth coordinated functions of movement, substain normal posture
Diencephalon 3 parts
hypothalamus, thalamus, pineal gland
hypothalamus
major center for controlling ANS, helps control the functioning of most internal organs; also controls temp, sleep cycles, emotions
thalamus
relays sensory information from sense organs in body to cerebral cortex
pineal gland
recieves sensory information about strength of light seen by eyes
Cerebrum
largest and uppermost part of the brain; mental processes of all types, including sensation, consciousness, memory,
spinal cord function
carrying impulses to and from brain
how many cranial nerves in PNS
12
how many spinal nerves in PNS
31
1 olfactory
sense of smell
2 optic
vision
3 oculomotor
controls eye muscles/movements
4 trochlear
controls eye muscles/movements
5 trigeminal
sensation to face, scalp and teeth; chewing
6 abducens
controls eye muscles/ movements
7 facial
sense of taste
8 vestibulochlear
hearing