MAJOR DIVISIONS OF NERVOUS SYSTEM Flashcards
(31 cards)
What does the nervous system connect?
All the body parts and it transmits signals from one part to another
Define nervous system
A system of cells, tissues, and organs, that regulates the body’s responses to internal and external stimuli
What are the Major Divisions of the Nervous System?
Central and Peripheral nervous system
The ___ serves as the main processing center for the entire nervous system
CNS
Two main components of CNS
Brain and Spinal Cord
An organ located within the skull that functions as organizer and distributor of information for the body
Brain
Brain has 3 parts
Cerebrum, Cerebellum, Brain Stem
Serves as a channel for signals between the brain and the rest of the body, and controls simple musculoskeletal reflexes without input from the brain
Spinal cord
This connects the CNS to the organs and limbs
PNS Peripheral nervous system
PNS 2 main divisions
Somatic nervous system
Autonomic nervous system
This system is associated with the voluntary control of body movements
Somatic nervous system
somatic nervous system has 2 parts
spinal nerves
cranial nerves
the nerves that carry motor and sensory signals between the spinal cord and the body
spinal nerves
the nerve fibers that carry information into and out of the brain stem
cranial nerves
this system is associated with the involuntary control of body movements
autonomic nervous system
autonomic nervous system has 2 subdivisions
sympathetic
parasympathetic
it is activated when the body is in dynamic role or stress
sympathetic
it maintains body functions and restores the body to normal or relaxed mode
parasympathetic
the basic unit of the nervous system
nerve cell
what are nerve cells called
neurons
how many neurons are in one part of the brain
12-14 billions
projecting out from the cell body are ROOT-LIKE STRUCTURES
Dendrites and axons
carry impulses towards the cell body
Dendrites
How long is a single dendrite
one meter long
