-
The spinal cord and brain is part of the
central nervous system
-
impulses cross a synase with the help of
chemicals, like actylcholine
-
the parasympathatic division controls
most normal day involuntary activities of our body
-
the iris of our eyes contain
smooth involuntary muscle
-
The inner area of the ear includes the
cochlea, vestibule, semicircular canals
-
the specialized endings (beginnings) of sensory neurons are called
cutaneous receptors, hearing receptors, and visual receptors
-
the level of stimulation that must be reached before a neuron will "fire up" is called the
threshold
-
the ortion of the neuron carrying impulses towards the neuron cell body is the
dendrite
-
the point where the axon fibers of one neuron come close to the dendrite fibers of the next neuron is called the
synapse
-
an important function of the spinal cord is to serve as
the reflex center
-
motor neurons have their cell bodies located in the
spinal cord
-
some important plexes are found in the
cervical and lumbar regions
-
the cerebellum
- concerned with balance and equilibrium
- somatic
-
the hypothalamus
- is an important autonomic center
- control of heart, bloodpressure, and tempurature
-
the vagus nerve is the
tenth cranial nerve
-
the muscles that move the eyeball around are called the
extrinsic eye muscle
-
intrinsic eye muscles
are attached to the lens of the eyes
-
functions of the nervous system
- stimulus-response system
- what our body does when a stimulus is picked up
-
neuroglia cell
- found in the brain and spinal cord.
- function: to fill spaces for structural support
-
neurons
- true conducting cells
- cannot divide
-
voluntary nervous systm
can fire at wil
-
involuntary nervous system
- sympathetic: speeds up
- parasympathetic: slows down
-
nerves are
bundles of neurons
-
basic structure of a neuron
- dendrite recieve stimulus
- cell body
- axon carry the stimulus aways
-
sensory (afferent)
message TOWARDS the brain
-
motor (efferent)
message AWAY from the brain
-
impulse
message traveling along the nerve and motor neurons together for reflex purposes
-
threshold
certain point in order to reach firing level
-
all or nothing law
message will keep moving if threshold is met. if not, nothing will send at all.
-
synapse
the breakdown between 2 neurons
-
function of the spinal cord
neural pathway for impulses going to thebrain. reflex center
-
structure of spinal cord
- pia matter, arachnoid, durra matter
- PAD
-
function of the brain
- interprets incoming sensory info
- initiates MOTOR response
-
how many pairs of spinal cords?
31 pairs!
-
special senses
- 1. eyes
- 2. ears (hearing and equilibrium)
- 3.olfaction (sense of smell)
- 4. taste
- 5.cutaneous (skin)
- 6. proprioception: awarness of muscles
|
|