Flashcards in Nerves 1 Deck (53):
What are the three functions of the Nervous system?
Sensory (receives stimuli)
Integrative (interprets and processes stimuli)
Effector (produces outgoing signal to initiate a response)
What is the CNS?
Central Nervous System
Brain and Spinal Cord
What is the PNS?
Peripheral Nervous System
Any neural tissue outside CNS
Describe the CNS
Contained within skull and vertebrae
Integrative in function (processes and understands sensory information to translate it into a response)
Describe the PNS
Outside of skull and vertebrae
Sensory organs of vision, hearing, etc.
What are peripheral nerves?
Cranial and Spinal nerves
What are peripheral ganglia?
Autonomic nervous system ganglia
Afferent division of Peripheral Nerves
Bring sensory information in from receptors
Efferent division of Peripheral nerves
Carries motor commands to effectors
Define Nerve cells
Electrically active cells that process and conduct information in the form of electrical signals
What neuroglia are in the PNS?
What neuroglia are in the CNS?
What do oligodendrocytes do?
What do astrocytes do?
General support cells
What do microglia do?
clean up damage
What do schwann cells?
What fibers transmit information in the PNS?
What fibers transmit information in the CNS?
White matter, fiber tract, column
What nerve cell bodies process information in PNS?
What nerve cell bodies process information in CNS?
Grey matter, nucleus, cortex
____ gray horns contain somatic and visceral sensory nuclei
____ gray horns deal with somatic motor control
____ gray horns contain visceral motor neurons
Size of grey matter (number of nerve cells) is related to
The size of body innervated
Ascending white matter tracts
relay information from spinal cord to the brain
Descending white matter tracts
carry information from brain to spinal cord
The adult spinal cord
_____ root of spinal nerve is afferent
___ root of spinal nerve is efferent
Region of the skin monitored by the sensory afferents of a single spinal segment
thalamus and hypothalamus
pons and cerebellum
Where is the highest level of processing located?
The basal nuclei of cerebral hemispheres
dictate motor control
Relays sensory information to appropriate processing center
Is involved with ANS and endocrine control
The cortex of cerebellum
Coordinates motor control
Define projection fibers
Ascending and descending tracts of the spinal cord, brainstem, and brain (connect up to down)
Define association fibers
Connect between areas on the same side of the CNS
Define commissural fibers
Connect between areas on opposite sides of CNS (connect right to left)
Brain and spinal cord tissue develop from
Cells in the walls of the developing hollow neural tube
Ventricles of brain and spinal canal of spinal cord develop from
Hollow center of neural tube
What support mechanisms are there of the CNS?
Blood Brain barrier
Specialized connective tissue layers (Dura, arachnoid, pia matter)
Provide physical stability and shock absorption
Support blood vessels entering and exiting CNS tissue
Cerebrospinal fluid is
Produced in ventricles
Fills subarachnoid space
How is CSF produced
Diffused out of capillaries into choroid plexus into ventricles
Although CSF comes from blood and returns to blood
IT IS NOT BLOOD
What does CSF do?
Transports nutrients, chemical messengers, and waste products
Provides cushioning and buoyancy