Chapter 10 The Nervous System A&P Flashcards
two primary parts of the nervous system
central and peripheral nervous system
includes the brain and spinal cord
central nervous system
includes the 12 pairs of cranial nerves extending from the brain and the 31 pair of peripheral nerve extending outward from the spinal cord
peripheral nervous system
is one or more bundles of neurons that connect the brain and spinal cord with other parts of the body
nerve
is a bundle or group of nerve fibers located within the brain or spinal cord
tract
carry nerve impulses toward the brain
ascending nerve tracts
carry nerve impulses away from the brain
descending nerve tracts
is a nerve center made up of a cluster of nerve cell bodies outside the central nervous system.
ganglion
means the supply of nerves to a specific body part
innervation
is a network of intersecting spinal nerves
plexus
are the sites in the sensory that receive external stimulation
receptors
is an automatic, involuntary response to some change, either inside or outside the body
reflex
are the basic cells of the nervous system that allow different parts of the body to communicate with each other
neurons
patterns of neuron electrical activity
brain waves
what are the three parts of a neuron
dendrites, axon, cell body
are the root-like processes that receive impulses and conduct them to the cell body
dendrites
is a structure that extends out from the body cell
process
is a process that conducts impulses away from the nerve cell
axon
also known as sensory neurons, these neurons emerge from sensory organs and the skin to carry the impulses from the sensory organs toward the brain and spinal cord
afferent neurons
also known as associative neurons, these neurons link afferent and efferent neurons
connecting neurons
also known as motor neurons, these neurons carry impulses away from the brain and spinal cord and toward the muscles and glands
efferent neurons
means toward
afferent
means away from
efferent
are the branching fibers at the end of the axon that lead the nervous impulse from the axon to the synapse
terminal end fibers
is the space between two neurons or between a neuron and a receptor organ
synapse
are chemical substances that make it possible for messages to cross from the synapse of a neuron to the target receptor
neurotransmitters
is released at some synapses in the spinal cord and at neuromuscular junctions; it influences muscle action
acetylcholine
is released within the brain. it is believed to be involved in mood and thought disorders and in abnormal movement disorders such as Parkinson’s disease
dopamine
are naturally occurring substances that are produced by the brain to help relieve pain
endorphins
affects alertness and arousal, increasing blood pressure and heart rate, and releasing stores of glucose in response to stress
norepineprhine
is released in the brain, has roles in sleep, hunger, and pleasure recognition. sometimes linked to mood disorders
serotonin
provides support and protection for neurons
glial cells
is the protective covering made up of glial cells. white sheath forms the white matter of the brain and covers some parts of the spinal cord
myelin sheath
portion of nerve fibers that are myelinated are known as
white matter
means having a myelin sheath
myelinated
portion of nerve fibers that are unmyelinated are known as
gray matter
means lacking a myelin sheath
unmyelinated
is made up of the brain and spinal cord
central nervous system
are a system of membranes that enclose the brain and spinal cord
meninges
is the thick, tough, outermost membrane of the meninges
dura mater (tough mother)
inner surface of the vertebral column is known as the. located between the walls of the vertebral column and the dura mater of the meninges
epidural space
is located between the dura mater and the arachnoid membrane
subdural space
resembles a spiderweb, is the second layer of the meninges and is located between the dura mater and the pia mater
arachnoid membrane
is located below the arachnoid membrane and above the pia mater
subarachnoid space
is the third layer of the meninges, is located nearest to the brain and spinal cord
pia mater
is produced by special capillaries within the four ventricles located in the middle region of the cerebrum
cerebrospinal fluid
is the largest and uppermost portion of the brain.
cerebrum
means pertaining to the cerebrum or to the brain
cerebral
which is made up of gray matter, is the outer layer of the cerebrum and is made up of elevated folds and deep fissures
cerebral cortex
are the elevated folds of gray matter in the cerebral cortex
gyri
are the fissures of the cerebral cortex
sulci