Nervous System Flashcards
Anatomy of Nervous System
The nervous system consists of the brain, spinal cord, and nerves and may be divided into two parts: the central nervous system (CNS) and the peripheral nervous system (PNS). The central nervous system consists of the brain and spinal cord. The peripheral nervous system is made up of cranial nerves, which carry impulses between the brain and neck and head, and spinal nerves, which carry messages between the spinal cord and abdomen, limbs and chest.
Function of Nervous System
The nervous system forms a complex communication system allowing for the coordination of body functions and activities. As a whole, the nervous system is designed to detect changes inside and outside the body, to evaluate this sensory information, and send directions to muscle or glands in response. This system also provides for mental activities such as thought, memory and emotions.
brain
contained within the cranium, the center for coordinating body activities
cerebrum
largest portion of the brain, divided into left and right hemispheres. The cerebrum controls the skeletal muscle, interprets general senses (such as temp., pain, and touch), and contains centers for sight and hearing. Intellect, memory, and emotional reactions also take place in the cerebrum
ventricles
spaces within the brain that contain fluid called cerebrospinal fluid. The cerebrospinal fluid flows through the subarachnoid space around the brain and spinal cord.
cerebellum
located under the posterior portion of the cerebrum. Its function is to assist in the coordination of skeletal muscles and to maintain balancee (also called hindbrain)
brainstem
stemlike portion of the brain that connects with the spinal cord. 10 of the 12 cranial nerves orginate in the brainstem.
pons
literally means bridge. It connects the cerebrum with the cerebellum and brainstem
medulla oblongata
located between the pons and spinal cord. It contains the centers that control respiration, heart rate, and the muscles in the blood vessel walls, which assist in determning blood pressure
midbrain
most superior portion of the brainstem
cerebrospinal fluid (CSF)
clear, odorless fluid contained in the ventricles that flows through the subarachnoid space around the brain and spinal cord. It cushions the brain and spinal cord from shock, transports nutrients and clears metabolic waste.
spinal cord
passes through the vertebral canal extending from the medulla oblongata to the level of the second lumbar vertebra. The spinal cord conducts nerve impulses to and from the brain and initiates reflex action to sensory information without input from the brain
meninges
three layers of membrane that cover the brain and spinal cord
dura mater
tough outer layer of the meninges
arachnoid
delicate middle layer of the meninges. It is loosely attached to the pia mater by weblike fibers, which allow for the subarachnoid space.
pia mater
thin inner layer of the meninges
nerve
cordlike structure made up of fibers that carries impulses from one part of the body to another. There are 12 pairs of cranial nerves and 31 pairs of spinal nerves
ganglion (pl. ganglia)
group of nerve cell bodies located outside the central nervous system
glia
specialized cells that support and nourish nervous tissue. Some cells assist in the secretion of cerebrospinal fluid and others assist with phagocytosis. they do not conduct impulses. three types of glia are astroglia, oligodendroglia, and microglia (also called neuroglia)
neuron
a nerve cell that conducts nerve impulses to carry out the function of the nervous system. Destroyed neurons cannot be replaced
cerebell/o
cerebellum
cerebr/o
cerebrum, brain
dur/o
hard, dura mater
encephal/o
brain
gangli/o, ganglion/o
ganglion
gli/o
glia, gluey substance
mening/o, meningi/o
meninges
neur/o
nerve
radic/o, radicul/o, rhiz/o
nerve root (proximal end of a peripheral nerve, closest to the spinal cord)
esthesi/o
sensation, sensitivity, feeling
ment/o, psych/o
mind
mon/o
one, single
phas/o
speech
poli/o
gray matter
quadr/i
four
-iatrist
specialist, physician (logist also means specialist)
-iatry
treatment, specialty
-ictal
seizure, attack
-paresis
slight paralysis (-plegia also mean paralysis)
cerebellitis (ser-e-bel-I-tis)
inflammation of the cerebellum
cerebral thrombosis (se-RE-bral throm-BO-sis)
pertaining to the cerebrum, abnormal condition of a clot (blood clot in a blood vessel of the brain) (cause of ischemic stroke)
duritis (du-RI-tis)
inflammation of the dura mater
encephalitis
inflammation of the brain
encephalpmalacia (en-sef-a-lo-ma-LA-sha)
softening of the brain
encephalomyeloradiculitis (en-sef-a-lo-mi-e-lo-ra-dik-u-LI-tis)
inflammation of the brain spinal cord, and nerve roots.
ganglitis
inflammation of the ganglion
glioblastoma
tumor composed of developing glial tissue (most common and most malignant tumor of the brain)
glioma
tumor composed of the glial tissue (used to describe all primary neoplasms of the brain and spinal cord)
meningioma
tumor of the meninges (benign and slow growing)
meningitis
inflammation of the meninges
meningocele (me-NING-go-sel)
protrusion of the meninges and spinal cord (also called myelomeningocele)
monoeuropathy (mon-o-nu-ROP-a-the)
disease affecting a single nerve
neuralgia (nu-RAL-ja)
pain in the nerve
neurasthenia (nu-ras-THE-ne-a)
nerve weakness
neuritis
inflammation of the nerve
neuroarthropathy
disease of nerves and joints
neuroma
tumor made up of nerve cells
neuropathy
disease of the nerves (peripheral)
poliomyelitis
inflammation of the gray matter of the spinal cord (commonly called polio and caused by one of 3 viruses)
polyneuritis
inflammation of many nerves
polyneuropathy
disease of many nerves
radiculitis
inflammarion of the nerve roots
radiculopathy
disease of the nerve root
rhizomeningomyelitis
inflammation of the nerve root, meninges, and spinal cord
subdural hematoma
pertaining to below the dura mater, tumor of blood
alzheimer disease (AD)
disease characterized by early dementia, confusion, loss of recognition of persons, or fimiliar surroundings, restlessness and impaired memory
amyotrophic lateral sclerosis (ALS)
progressive muscle atrophy caused by degeneration and scarring of neurons along the lateral columns of the spinal cord that control muscles (also called Lou Gehrig disease)
Bell palsy
paralysis of muscles on one side of the face, usually a temporary condition. signs include a sagging mouth on the affected side and nonclosure of the eyelid
cerebral aneurysm
aneurysm in the cerebrum
cerebral embolism
an embolus lodges in a cerebral artery, causing a sudden blockage of blood supply to the brain tissue.
cerebral palsy (CP)
condition characterized by lack of muscle control and partial paralysis, caused by a brain defect or lesion present at birth or shortly after
dementia
cognitive impairment characterized by a loss of intellectual brain function