U4 Lecture 27 Flashcards
how many neurons does our nervous system contain
85 billion
how many synapses does each neuron have
10 thousand
what is a synapse
contact with other neurons
the brain is never ____
static
what are the functions of the nervous system
- sensory function
- integrative function
- motor function
describe how the sensory function works
information goes to the brain and spinal cord via cranial and spinal nerves
describe how integrative function works
integrates sensory information by analyzing and storing it
describe how motor function works
information from the brain and spinal cord is set out to muscles or glands (effectors)
what type of neurons control sensory function of the nervous system
afferent neurons
what type of neurons control integrative function of the nervous system
interneurons
what type of neurons control the motor function of the nervous system
efferent neurons
what are the two “types” of nervous systems?
central nervous system
peripheral nervous system
what are the 3 “types” of the peripheral nervous system?
enteric nervous system
somatic nervous system
autonomic nervous system
where is central nervous system located
brain and spinal cord
where is the peripheral nervous system located
cranial and spinal nerves
where is the enteric nervous system located
smooth muscle and glands of GI tract
where is the somatic nervous system located
skeletal muscles
where is the autonomic nervous system located
smooth muscle
cardiac muscle
glands
what are the two “divisions” of the autonomic nervous system
sympathetic division and parasympathetic division
what are the neuronal tissue types
- nerve cells
- glial cells
what do nerve cells make up
neurons
what do glial cells make up
neuroglia
what do nerve cells do
they are involved in the generation and interpretation of electrical signals
what do glial cells do
insulate support and nourish neurons
