Chapter 2 - Brain & Behavior Flashcards
What are the two main branches of the nervous system?
central and peripheral
The Central Nervous System (CNS).
Brain and the spinal cord.
A column of nerves that transmits information between the brain and the peripheral nervous system?
Spinal cord
Major nerves that carry sensory and motor messages in and out of the spinal cord
Spinal nerves
Peripheral Nervous System (PNS)
The part of the nervous system outside the brain and spinal cord
a cell in the nervous system that transmits information
neuron
large bundles of many neuron fibers (called axons). or a bundle of neuron axons.
Nerves
Major nerves that leave the brain without passing through the spinal cord
cranial nerves
The Peripheral Nervous System (PNS) can be divided into two major parts which are?
The somatic nervous system (SNS) & The Autonomic Nervous System (ANS)
A network linking the spinal cord with the body and sense organs.
Somatic nervous system (SNS)
The collection of axons that carry information to and from internal organs and glands
Autonomic Nervous System (ANS)
The autonomic nervous system (ANS) can be divided into two branches:
Sympathetic & parasympathetic
The division of the autonomic nervous system that coordinates arousal
initiates “fight or flight”
sympathetic nervous system
The division of the autonomic nervous system that quiets the body and conserves energy
parasympathetic nervous system
Four basic parts of a neuron:
1- Dendrite
2- Cell Body
3 - Axon
4 - Axon terminals
Neuron fibers that receive incoming messages
look like tree roots
dendrites
The part of the neuron or other cell that contains the nucleus of the cell. Soma - Receives information from the dendrites
Cell Body
the fiber that carries information away from the cell body of a neuron.
Axon
bulb-shaped structures at the ends of axons that form synapses with the dendrites and cell bodies of other neurons.
axon terminals
electrically charged molecules called __ are found inside and outside of the each neuron.
ions
The electrical charge of an inactive neuron
resting potential
In neurons, the point at which a nerve impulse is triggered
threshold
a brief change in a neurons electrical charge
action potential