Chapter 11 Intro. Nervous System Flashcards
Nervous system
°Controls our perception and experience of the world.
° Directs voluntary movement.
° Seat of consciousness, personality learning, and memory.
° Regulate homeostasis.
2 divisions of the Nervous system
What are they?
°CNS - central nervous system
°PNS - peripheral nervous system
CNS are what parts of the body?
The brain and spinal cord
PNS are what parts of the body?
Consist of all nerves in the body
Cranial nerves and spinal nerves
Functions of the nervous system
(3 functions)
°Sensory function (PNS)
°Integrative functions (CNS)
°Motor functions
Sensory function (PNS)
°Sensory receptors gather info. about internal & external environment
°Afferent division carries info to CNS
Integrative functions (CNS)
Analyze and interpret incoming sensory info. and determines response
Motor functions
°action performed in response to integration
°efferent division carries info away from CNS
efferent division
(2 types of nervous systems)
carries info away from CNS
°Somatic nervous system
°Autonomic nervous system
Somatic nervous system
Carries info. to skeletal muscles
Autonomic nervous system (ANS)
Carries info. to smooth muscle, cardiac muscle, and glands
Afferent division
Carries info to CNS
Neurons
Excitable cells that are responsible for receiving and sending signals in the form of action potentials
Structure of neurons
°cell body
°dendrites
°axon
Structure of neurons
Cell body (soma) :
°nucleus
°cytoplasm with organelles
Structure of neurons
Dendrites:
Processes that receive info from other neurons, conduct impulse towards soma
Structure of neurons
Axon:
A processes that is a nerve fiber that conducts impulse away from soma
Processes
Cytoplasic extensions
Dendrites and axon
Structural neurons
(3 of them)
°Multipolar neurons
°Bipolar neurons
°Unipolar neurons
Structural neurons
Multipolar neurons:
(motor)
Single axon with multiple dendrites
Structural neurons
Bipolar neurons:
(Sensory)
One axon and one dendrite with the cell body between them.
Structural neurons
Unipolar neurons:
(Sensory)
Has only one fused axon that extends from the cell body and divides into 2 processes.
Functional neurons
(3 of them)
°Sensory
°Interneurons
°Motor
Functional neurons
Sensory neurons
(Afferent neurons)
Carries info towards CNS, they are Unipolar neurons and Bipolar neurons
Functional neurons
Interneurons
(Association neurons)
Relay info within CNS between sensory neurons and motor neurons, makes up most of the neurons in the body are Multipolar neurons
Functional neurons
Motor neurons
(Efferent neurons)
Carries info away from cell body in CNS to muscles and glands they are Multipolar neurons
CNS
Central nervous system
°Nuclei- cluster of neuron cell bodies
°tracts- bundle of axons
PNS
Peripheral nervous system
°ganglia- cluster of neuron cell bodies
°nerves- bundle of axons