afferent receptors
aka sensory receptors
detect changes that occur inside and outside the body and convey them to the brain
efferent receptors
send motor signals from the brain to muscles and glands to cause an effect
somatic nervous system
the part of the nervous system under conscious and voluntary control
autonomic nervous system
part of the nervous system that relates to involuntary or automatic body functions
central nervous system
the control system including the brain and spinal cord
peripheral nervous system
consists of various nerve processes that connect the brain and spinal cord with receptors, muscles, and glands
dendrites
transmit impulses to the cell body
axons
carry impulses away from the cell body
neuroglia
aka glia
the supporting tissue cells of the nervous system
hypothalamus
beneath the thalamus
meninges
three membranes of the brain
cerebrospinal fluid
provides additional protection for brain and spinal cord
chemoreceptors
nerve endings that detect chemicals
thermoreceptors
located immediately under the skin to detect changes in temp
photoreceptors
responsible for vision
lacrimal
pertaining to tears
lacrimation
refers to the production and discharge of tears
nasolacrimal ducts
carry tears to nasal cavity
cornea
convex, transparent structure at the front of the eyeball
retina
located in the posterior part of the eye & contains photoreceptors (cones & rods)
electroencephalography
the recording and analysis of the electrical activity of the brain
electroencephalogram
the record obtained from an electroencephalography
epidural hematoma
blood accumulates in the epidural space
subdural hematoma
accumulation of blood beneath the dura mater
intracerebral hematoma
bleeding that occurs within the brain
cerebrovascular accident
normal blood supply to the brain is disrupted
aka stroke
transient ischemic attack (TIA)
caused by a brief interruption in cerebral blood flow
refers to deficient blood circulation
symptoms include disturbance of normal vision, dizziness, weakness, and numbness
hydrocephalus
accumulation of fluid in the skull
akinesia
complete or partial loss of muscle movement
anesthesia
partial or complete loss of sensation with or without loss of consciousness
aphagia
inability or refusal to swallow
aphasia
an abnormal condition in which there is an absence or impairment of the ability to communicate through speech, writing, or signs
astigmatism
uneven curvature of the cornea or lens of the eye that prevents the sharp focus of an image on the retina
bradykinesia
abnormal slowness of movement or sluggishness of mental or physical processes
cephalalgia
headache
cerebral concussion
loss of consciousness, either temporary or prolonged, as a result of a blow to the head
cerebral contusion
bruising of brain tissue as a result of a head injury
cerebral hemorrhage
result of the rupture of a sclerosed, diseased, or injured blood vessel in the brain
cerebral palsy
brain disorder characterized by paralysis and lack of muscle coordination; results from developmental defects in the brain or trauma at birth
coma
state of unconsciousness from which the patient cannot be aroused, even by powerful stimulation
diplegia
paralysis affecting like parts on both sides of the body
diplopia
double vision, the perception of two images of a single object
dyslexia
inability to read, spell, and write words despite the ability to see and recognize letters
dysphagia
difficulty in swallowing, usually associated with obstruction or other disorder of the esophagus
dysphasia
speech impairment caused by a lesion in the brain; characterized by lack of coordination and failure to arrange words properly
electromyography
preparation, study, and interpretation of an electromyogram, a graphic record of the contraction of a muscle as a result of electrical stimulation
encephalitis
inflammation of the brain
encephalocele
hernial protrusion of brain substance through a congenital or traumatic opening of the skull; craniocele
encephalomalacia
softening of the brain
encephalomeningitis
inflammation of the brain and meninges
encephalopathy
any disease of the brain
epilepsy
group of neurological disorders characterized by recurrent episodes of convulsive seizures sensory disturbances, loss of consciousness, or all of these
glaucoma
abnormal condition of increased pressure within the eye
hemiplegia
paralysis on one side of the body
hyperkinesia
abnormally increased activity or motor function
hyperopia
farsightedness, an error in the refraction in which the rays of light entering the eye are brought to focus behind the retina
meniere disease
chronic disease of the inner ear characterized by recurrent episodes of dizziness
meningitis
inflammation of the meninges
meningocele
herniation of the meninges through a defect in the skull or vertebral column
multiple sclerosis
chronic CNS disease with progressive destruction of the myelin sheaths of the neurons. resulting scar tissue interferes with the normal transmission of nerve impulses
myasthenia gravis
disease characterized by muscle weakness and abnormal fatigue
myelitis
inflammation of the bone marrow or spinal cord
myelography
radiographic examination of the spinal cord by injection of a radiopaque medium
myopia
nearsightedness; a defect in the vision in which rays of light entering the eye are brought to focus in front of the retina
narcolepsy
chronic aliment involving sudden attacks of sleep that occur at intervals
neuralgia
pain along the course of a nerve
neuritis
inflammation of a nerve
neuropathy
any disease of the nerves
paraplegia
paralysis of the legs and lower part of the body
parkinson disease
chronic nervous disease characterized by a fine, slowly spreading tremor, muscular weakness, rigidity, and often a peculiar gait
quadriplegia
paralysis of all four extremities
aka tetraplegia
retinal detachment
separation of the retina from the back of the eye, usually resulting from a hole or tear in the retina
retinopathy
any disease of the retina
shingles
acute, infectious eruption of vesicles, usually on the trunk of the body along a peripheral nerve
tinnitus
subjective ringing of one or both ears
psychosis
refers to any major mental disorder characterized by a gross impairment in reality testing and often characterized by inappropriate mood and diminished impulse control
schizophrenia
a gross distortion of reality, disorganization, and fragmentation of though and emotional reaction, and withdrawal from social interaction
pyromania
an impulse control disorder characterized by an uncontrollable urge to set fires
Bipolar disorders
characterized by manic episodes, major depression, or mixed moods
clinical depression
an abnormal emotional state characterized by exaggerated feelings of sadness, despair, emptiness, and hopelessness
phobia
a persistent, irrational, intense fear of something specific, such as fear of fire, meeting strangers, or leaving the familiar setting of home
agoraphobia
intense, irrational fear of open spaces.
anorexia nervosa
eating disorder associated with emotional stress or conflict characterized by a prolonged refusal to eat resulting in wasting, emotional disturbance concerning body image and fear of becoming obese
neurasthenia
a nervous condition characterized by chronic weakness, fatigue, and sometimes exhaustion
sometimes follows depression
autism
characterized by withdrawal and impaired development in social interaction and communication
Alzheimer disease
progressive mental disorientation with several characteristics including confusion, memory failure, restlessness, and inability to carry out purposeful movement
craniotomy
any surgical opening into the skull
cranioplasty
surgical repair of the skull after surgery or injury to the skull
shunts
passages or bypasses between two vessels
stereotactic radiosurgery
involves closed-skull destruction of a target using ionizing radiation
neuroplasty
plastic surgery to repair a nerve or nerves
neurorrhapy
suturing of a cut nerve
neurolysis
release of a nerve sheath by cutting it longitudinally
surgery to break up adhesions surrounding a nerve
relief of tension on a nerve
disintegration of nerve tissue
analgesics
agents that relieve pain without causing loss of consciousness
hyponotics
drugs used as sedatives to produce a calming effect
transcutaneous electrical nerve stimulation (TENS)
a method of pain control by the application of electrical impulses to the nerve endings
anticonvulsants
relieve or prevent convulsions