What are the two major parts of the nervous system?
The central nervous system (CNS) and the peripheral nervous system (PNS)
Sensory (afferent) division
Somatic and visceral sensory nerve fibers; Conducts impulses from receptors to the CNS
Motor (efferent) division
Motor nerve fibers; Conducts impulses from the CNS to effectors (muscles and glands)
Viscerosensory (visceral sensory nerve fibers)
"viscus"= organ; sensation from internal organs; part of the sensory division
Somatosensory (somatic sensory nerve fibers)
"soma"=body; sensation from skin sent down; part of the sensory division
Somatic Nervous System
Somatic motor=voluntary; conducts impulses from the CNS to the skeletal muscles; part of the motor (efferent) division
Autonomic Nervous System
Visceral motor (involuntary); conducts impulses from the CNS to cardiac muscles, smooth muscles, and glands.
Part of the Autonomic Nervous System; mobilizes body systems during activity; "fight or flight"; innervates skeletal muscle
Part of the Autonomic Nervous System; conserves energy; promotes house functions during rest; "rest and relax"
Sensation, Integration, and Reaction
Each neuron is capable of performing theses basic functions of the nervous system.
Concentrations of rough ER (needed for protein synthesis); responsible for making proteins needed by the cell.
Where other cells' axons usually make contact; mostly sensory neurons come into the dendrite and sent to the cell body; "processes"
One axon/neuron coming from the cell body, but then has multiple shooting off; carries info AWAY from the cell body; a SINGLE process that transmits an action potential.
Most sensitive to electrical charges in membrane potential; first part of the cell to depolarize; first part of an axon.