Organization of Nervous System
 Two major divisions:
1.
___________________________________________ (CNS)
 Includes _____________ and _________________
2.
___________________________________________ (PNS)
 Includes __________ other nerves
 sensory and motor neurons
Central Nervous System (CNS)
 Body’s ___________________ center
1.
Gathers incoming ___________________ information (afferent)
2.
Organizes and _________________ incoming information
3.
Issues outgoing __________________ commands to various parts of the body
(efferent)
 Connected to rest of body by _____________that make up the____________
Nervous System Tissue
 The two principal cell types of the nervous system are:
 _______________________ – excitable cells that transmit _________________ signals
 Supporting cells – cells that _____________ and ________________-neurons
 The supporting cells (__________________ or glial cells):
 Provide a ___________________________ scaffolding for neurons
 Segregate and __________________ neurons
 Guide young neurons to the proper ______________________
 Promote _______________ and growth
Cell Type: ________________
-Most abundant, versatile, and highly branched glial cells (CNS)
Function: _______________________________________________
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________
Found in (circle): CNS and/or PNS

Cell Type: ____________________
– small, ovoid cells with spiny processes
Function: _______________________________________________
_________________________________________________________
_________________________________________________________
_________________________________________________________
Found in (circle): CNS and/or PNS
Cell Type: ________________________
– range in shape from squamous to columnar
Function:
_____________________________________________________
______________________________________________________
______________________________________________________
______________________________________________________
______________________________________________________
Found in (circle): CNS and/or PNS
Cell Type: __________________________________________
Function: _______________________________________________
____________________________________________________________
____________________________________________________________
____________________________________________________________
____________________________________________________________
Found in (circle): CNS and/or PNS
Cell Type: __________________________________________
Function:
____________________________________________________
____________________________________________________
____________________________________________________
__________________________________________________
Found in (circle): CNS and/or PNS
Cell Type: __________________________________________
Function:
____________________________________________________
____________________________________________________
____________________________________________________
__________________________________________________
Found in (circle): CNS and/or PNS

NEURONS
 Structural units of the nervous system
 Long-lived, amitotic, and have a high metabolic rate
 Their plasma membrane function in:
 Electrical signaling
 Cell-to-cell signaling during development
DENDRITES
 Short, tapering, and branched
__________________
 They are the receptive, or
________________, regions of the neuron


CELL BODY (____________)
Contains the major cell structures found in all cells point for the outgrowth of dendrites & axons
NODES OF RANVIER
 ____________ in the myelin sheath between adjacent
Schwann cells
 When stimulated, action potentials can “_________” from node to node down an axon
 _______________ communication between neurons
MYLEIN SHEATH
 Whitish, fatty (protein-lipoid), segmented
_________ around most long ___________
 Formed by glial cells which wrap around the axon:
 _________________ cells in PNS
 Oligodendrocytes in ________
 Some neurons are non-mylenated
 functions are to:
 Protect the axon
 Electrically ________________ fibers from one another
 _____________ the speed of nerve
_________________ transmission
AXON
 Slender processes of uniform diameter extending from soma
 Long axons are called nerve
_________________
 Axon ___________________ – branched end of an axon that contain vesicles of
______________________________(NT)
Axon Functions:
 Generate and transmit
__________________________________
 ____________ NT from the axon terminals