Overview Flashcards
Define nervous system
Network of fibres permeating body, coordinating voluntary and involuntary actions.
Transmits signals
Responds quickly to changes in internal/external environment
Two parts nervous system
CNS - brain, spinal cord
PNS - peripheral nerves
Sensory function carried out by which neuroma
Afferent
(Sensory) neutrons
Integrative function
Processing sensory information, analysing storing causing perception carried out by which neurons
Interneurons
Motor response
Impulse carried out by
Motor
Efferent
Neurons
3 PNS sensory receptors internal environment
Chemoreceptors
Baroreceptors
Osmoreceptors
Autonomic
Role of brain in CNS
Receives/processes sensory info
Initiates responses
Stores memories
Generates thoughts, emotions
Role spinal cord CNS
Conducts signals to/from brain
Controls reflex activities
Role of motor neurons PNS
CNS to muscles and glands
Role of sensory NEURONS CNS
Sensory organs to CNS
Motor neurons 2 categories
Somatic NS
Autonomic NS
Autonomic NS two types
Sympathetic
Parasympathetic
Role somatic NS
Controls voluntary movements
Role autonomic NS
Controls involuntary responses
Which tissues does ANS affect
Organs
Glands
Cardiac & smooth muscles
Sympathetic innervates
Thoraco-lumbar innervation
Parasympathetic innervates
Cranio-sacral innervation
5 examples of what ANS controls
Rate/force heart beat Gland activity Vessel diameter - vasoconstriction/dilation Bronchi construction/dilation Pupillary construction/dilation
Enteric NS brain of
GIT
How enteric NS relate to autonomic NS
Functions autonomously
Regulated by ANS
interacts extensively with CNS
Enteric links with CNS sympathetic via
Pre-vertebral ganglia
Enteric links with CNS parasympathetic via
Vagus
Role of sensory neurons in enteric NS
Monitor chemical changes via chemoreceptors
Monitors stretching via stretch receptors
Of GI Tract
Motor neurons role in enteric NS
Govern motility and secretions of GI tract and ass glands
Role of interneuro a Gi Tract
Connect 2 plexus was
Enteric submucosal plexus contains
Sensory cells that communicate with myenteric plexus and motor fibres that stimulate secretion of fluids into the lumen
Enteric NS myenteric plexus contains
Neurons that regulate enzyme output of adjacent organs
What is an ion
Charged particle
Baroreceptors measure
Pressure
Osmoreceptors measure
Water
Neurons communicate with 3
Other Neurons
Muscles
Glands
3 functions CNS
Sensing
Moving
Processing
High BP sympathetic/ parasympathetic
Sympathetic
3 factors affect BP
Heart rate
Blood volume
Vasoconstriction
Two locations in body for stored glucose (glycogen)
Liver and muscles
short distance communication in sensory nerves called
graded potential
touch excites a _ in the sensory nerve in your fingers
graded potential
which nervous system can regenerate
only the peripheral nervous system - not the CNA
ability for NS to change - sprouting new dendrites, changes in synaptic contacts known as
plasticity
