nervous system 2 Flashcards
protective, membranes covering brain and spinal cord
meninges
medulla oblongata, pons, and midbrain make up of
brainstem
stuctures of the brainstem
medulla oblongata, pons, mid brain
upward extension of spinal cord that consists of gray and white matter
medulla oblongata
reflex centers ( cardiac, Respiratory, and vasomotor-blood vessel) located here
medulla oblongata
acts as a filter and assists in focused attention
reticular formation
consists of hypothalamus and thalamus
diencephalon
controls internal organs and maintains body temperature
diencephalon
this stucture is below the thalamus
hypothalamus
exterts major control over most internal organs
hypothalamus
some neurons of this structure function as an endocrine gland and make hormones
hypothalamus
helps control functioning of every cell in the body and maintain body temperature, water balance, and sleep cycles
hypothalamus
control of appetite and emotions
hypothalamus
dumbbell shaped section of gray matter
thalamus
alerting mechanism: helps produce sensations from impulses associates sensations with emotions
thalamus
second largest part of the human brain
cerebellum
its functions; normal postures, normal movements, balance, precise movements, smooth coordinated movements, maintain equilibrium
cerebellum
largest and uppermost part of the human brain
cerebrum
AKA convolutions; ridges of the cerebrum
gyri
grooves of cerebrum
sulci
deepest of the sulci
fissures
connects the 2 hemispheres of the cerebrum
corpus callosum
contains the auditory center of the brain
temporal lobe
contains the sight center of the brain
Occipital lobe
AKA basal ganglia
cerebral nuclei
islands of gray matter within the white matter; essential to produce automatic movemetns and postures
basal ganglia
damage to this part of the brain may result in the inability to think, use your will, remember, decide how to make a movement
cerebrum
involved in consciousness, thinking, memory, sensations, emotions, willed movements
cerebral cortex
this pathology involves the destruction of neurons of the motor area of cerebrum AKA stroke
cerebral vascular accident (CVA)
this pathology involves hemorrhage from cessation of blood flow through cerebral blood vessels aka stroke
cerebral vascular accident (CVA)
aka mini stroke
Temporary limitation of circulation
transient ischemic attack (TIA)
17-18 inches long in people of normal height
spinal cord
loss of sensation due to spinal cord injury
Anesthesia
loss of ability to make voluntary movements
Paralysis
tough, fluid containing membrane that surrounds brain and cord
Meninges
three layers of meninges
dura matter
aracnhoid
pia matter
tough outer layer of meninges
dura matter
middle layer of meninges
cobweb like with fluid in spaces
arachnoid
innermost membrane covering the cord
pia matter
one of bodys circulating fluids formed from blood and reasorbed into it
cerebral spinal fluid (CSF)
this is between pia mater and arachnoid
cerebral spinal fluid
this fills the ventricles (large spaces that lie deep inside brain)
cerebral spinal fluid
network of brain capillaries that filters CSF out of blood
choroid plexus
“water on the brain”
Hydrocephalus
cranial and spinal nerves and structures in autonomic nervous system
Peripheral nervous system
connect brain and cord to various glands, cardiac and smooth muscle in thorax and abdomen
Peripheral nervous system
number of pairs of cervical nerves
8
number of pairs of thoracic nerves
12
number of pairs of lumbar nerves
5
number of pairs of sacral nerves
5
number of pairs of coccygeal nerves
1
skin surface areas supplied by a single spinal nerve
dermatomes
this is made up of motor neurons that conduct impluses from the spinal cord or brainstem to: cardiac muscle tissue, smooth muscle tissue and glandular epitheial tissue
autonomic nervous system
has two divsions; parasympathetic and sympathetic
autonomic nervous system
motor nerves that control voluntary actions of the skeletal muscles
somatic nervous system
cells that digest parts of dead neurons; parts of the brains endogenous defense and immune system; protects CNS from various types of pathogens
micro glia
cells involved in most neural processes: physical and nutritional support for neurons, digest parts of dead neurons and regulate the content of the extracellular space; contribute to memory formation
astrocytes
nerve cell name that means “nerve glue”
neuroglia
provide insulation (myelin) for neurons in the CNS; all white matter tracts contain oligrodendrocytes; involved in mutliple scerlosis cauing a loss of myelin
oligrodendrocytes
“junction boxes”
ganglia
autonomic neurons that conduct impulses between cord and a ganglion
preganglinotic
autonomic neurons that conduct impluses from ganglion to cardiac muscle, smooth muscle and epitheial tissue
postganglinotic
AKA visceral effectors
tissues to which autonomic neurons conduct impluses
autonomic effectors
cardiac muscle, smooth muscle and glandular epithelial tissue
autonomic effectors
AKA craniosacral system; divsion of autonomic nervous system that invloves slow heart beat and increases peristalsis and secretion of digestive juices and insulin
Parasympathetic
digestive tract contractions
Peristalsis
how much does the brain weigh
3 lbs
contains nerve fibers that innerate a specifc region of the body
plexus