Nervous System Flashcards
includes the brain, spinal cord, and receptors in the sense organs
Neural tissue
the functional unit of the brain, transmits electrical impulses
Neurons
supporting cells that separate, protect, give structure, and are phagocytic
Neuroglia
What are the two divisions of the nervous system?
1) central nervous system
2) peripheral nervous system
What does the CNS do/control?
1) relays info
2) processes info
3) analyzes info
What does the PNS do/control?
1) receives info from the environment
2) relays commands from the brain
What is the CNS made up of?
brain and spinal cord
What is the PNS made up of?
cranial and spinal nerves
what controls voluntary actions?
Somatic nervous system
What controls the involuntary actions?
Autonomic nervous system
What are the two branches of the autonomic nervous system?
1) Sympathetic
2) parasympathetic
What does the sympathetic nervous system do to your metabolism?
Speeds it up
What does the parasympathetic nervous system do to your metabolism?
Slows it down
part of the neuron, contains the nucleus and the cytoplasm
Cell Body
part of the neuron, the end of the neuron that connects to other cells
Dendrites
part of the neuron, long fiber that connects the cell body to the terminal end
Axon
part of the neuron, area where 2 neurons meet (gap)
Synapse
chemicals that allow communications between two nerves
neurotransmitters
area where nerve connects to muscle
neuromuscular junction
area where nerve connects to muscle and glands connect
Neuroglandular Junction
What are the three types of neurons?
1) sensory
2) motor
3) interneurons
type of neuron, connected to sense organs
sensory
type of neuron, connect to muscles
Motor
type of neuron, connects one neuron together
Interneurons
3 protective layers that surround the brain and spinal cord
spinal meninges
fluid surrounding the brain and spinal cord
cerebrospinal fluid
What are the three layers of the spinal meninges?
1) Dura mater
2) Arachnoid
3) Pia mater
layer of the spinal meninges, outer protective layer
Dura mater
layer of the spinal meninges, separates dura mater and the brain, looks like a spider web
Arachnoid
layer of the spinal meninges, directly covers the brain
Pia mater
made up of 100 billion neurons, 3 pounds
Brain
part of the brain, upper portion of the brain, 2 halves, largest part
Cerebrum
What are the 4 parts of the cerebrum?
1) Frontal
2) Parietal
3) Temporal
4) Occipital