Chp.14 Flashcards
Main functions of nervous system
Collect info: receptors in PNS detecting changes
Process and evaluate: CNS determines response
Initiate response: CNS initiates impulse that PNS Carries to effectors to react to changes in environment
Sensory is
Afferent
Structural class of nervous system
PNS : spinal nerves, cranial nerves and ganglia
CNS : brain spinal cord
Functional class of nervous system
Motor nervous system (efferent) : sends impulses from CNS to PNS to muscles and gland
Somatic motor (SNS): voluntary ; conducts impulses that cause contraction of skeletal muscle
Autonomic motor (ANS): involuntary; conducts impulses that regulate smooth and cardiac muscle tissues as well as gland
Functional subdivision of nervous system sensory
Sensory nervous system: receives sensory info from receptors in PNS and transmits it to CNS
Somatic: conscious; general 5 senses
Visceral sensory: not conscious; impulses from blood vessels and internal organs
All sensory neurons are
Unipolar
Inter neurons can only be found in
CNS
Another neuron stimulates what
Dendrites
Neurons are
Excitable
Highly metabolic
Amitotic
Secretory
Conductive
Long lived
Classification of neurons structural
Unipolar
Bipolar
Multipolar
Functional classification of neurons
Sensory- transmits impulses from CNS
Motor- transmits impulses from CNS to muscles or glands
Interneurons- retrieve and process store info and communicate between motor and sensory neurons
Function of glial cells
Protect and nourish neurons
Glail cells in CNS
Astrocytes- BBB
Ependymal- ciliated cuboidal produces CSF
Microglial- remove debris
Oligdendrocytes- wrap themselves around axons of CNS to produce myelin sheath
Glail cells in PNS
Satellite- regulates fluid around neuron cell bodies
Nuerolemmocyte- forms Myelin sheath around PNS axons
