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CNS

TermDefinition
Dendrite Carry impulses to cell body
Axon Carry impulses away from the cell body
Synapse Communication between neurons
Myelin Sheath Speeds up the action potential
CNS Brain and Spinal cord
Sensory Neuron Carry info to the brain or spinal cord
Motor Neuron Carry info away from brain or spinal cord
Neuroglia Supporting cells of the CNS&PNS
PNS All nerve tissue outside the CNS
6 types of neuroglia Astrocytes, oligodendrocytes, satellite cells, schwann cells, macrophages
Neuroglia found in the PNS Satellite cells, schwann cells
Neuroglia that form myelin Schwann cells, oligodendrocytes
Provide nutrients to neurons and help form blood brain barrier Astrocytes
Protect because they are phagocytic macrophages
Basic difference between neurons and neuroglia Neurons are the communicators, neuroglia support and protect neurons
More neurons or more glia in CNS 50 times more Glia
Myelin Insulating sheath around an axon, made for speed and protection
How does Myelin form Myelination
Describe Meningies 3 membranes that surround the surface of the CNS
Describe Action Potential Spreading wave of depolarization
How is an Action potential formed? When Na+ diffuses into a cell and causes depolarization
Where is Ca+ important? Synapse, muscle contraction
Physiological diff between nerve and muscle action potential A nerve action potential can only travel forward whereas a muscle action potential can travel backward, also
Nodes of Ranvier are sections of axons that lack.. Myelin
Thalamus Major sensory relay station
Hypothalamus regulates endocrine system
Choroid plexus Site of CSF formation
Medulla Oblongata Respiratory and Cardiovascular centers
Diencephalon Contains 3rd ventricle
Cerebellum Coordinates balance and posture
Subarachnoid space Site of CSF circulation
Central sulcus Divides motor and sensory cortex
Pons accessory respiratory center
pineal gland secretes melatonin
level of spinal cord a spinal tap is done at between 3 and 4
Where does the spinal cord end? L2
CSF excreted from subarchnoid space
structure to avoid when inserting a needle vertebrae
conus medullaris tip of spinal cord that gives rise to the filum terminale
5 basic parts of a reflex arc sensory receptors, sensory neurons, CNA, motor neuron, effect
Effectors peripheral gland or muscle cells intervated by a motor neuron
anatomical structures that are included as effectors glands and muscles
CN I test smell something
CN II test vision test
CN III test Blink
CN IV test Follow finger with eyes
CN V test touch cotton ball to face, see if they feel it
CN VI test Follow fingers with eyes without moving head
CN VII test smiles, frown
CN VIII test whisper
CN IX test swallow
CN X test measure vitals
CN XI test shrug shoulders
CN XII test stick tongue out
3 cranial nerves that mainly sensory I II VIII
3 functions of NS movement, sensory, somatic
Role of Calcium in nerve transmission at chemical synapse Ca++ rushes into the knob and triggers exocytosis of synaptic vessicles and release of ACh into synaptic cleft
Created by: 100007976046518