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24 terms

Anatomy Smeester 2 Final

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Afferent
Carrying to or toward a center
Efferent
Carrying away or away from
Somatic
Carries feedback information to somatic intergration centers in the cns
Autonomic
Efferent division of the peripheal nervous system that innervates cardiac, smooth muscles & glands also called the involuntary or visceral motor system
Oligodendrocytes
Cells that form from the myelin sheath in the central nervous system
Schwaan cells
Cells formed from the myelin sheath in the peripheal nerous system
Function of Myelin Sheath
Protects & electrically insulates fibers from one another & increases the speed of transmission of nerve impulses
How does the myelin sheath speed up transmission impulses in the nervous system
Myelinated Fibers conduct nerve impulses, rapidly, whereareas unmyelinated fibers tend to conduct impulses slowly
Nodes Or Ranvier
Small Spaces between the myelin sheath covering the axons of neurons
Difference between gray and white matter in the brain. How does it relate to myelin sheaths?
Regions of the brain and spinal cord containg dense collections of myelinated fibers reffered to as white matter primarily fiber tracts. Gray matter contains mostly nerve cellbodies & unmyelinated fibers.
Direction of impulse conduction in a neuron
Dendrite>Cell Body>Axon
What structures make up the central nervous system
Brain & Spinal Cord
What structures make up the peripheal nervous system
Nerves & Ganglia that lie outside of the brain & spinal cord
Function of neurotransmitters
Open & Close ion channels that influence membrane permeability & consequently membrane potential
Difference between chemical synapse and electrical synapse
Electrical synapses specialized to allow the flow of ions between neurons. While chemical synapses are specialized to release reception of chemical neurotransmitters.
Layers of connective tissue
Perineurium>Endoneurium>Epineurium
Action Potential
A large transient deplorazation event, including ploarity reversal thatis conducted along the membrane of a muscle cell or nerve fiber
Which ions move through stimulus gated channels?
Sodium and pottasium
What is the resting membrane potential of a neuron
-70mV
What are the effectors of the somatic nervous system?
Voluntary
What are the effectors of the autonomic nervous system?
Involuntary
Mixed nerve
Nerves containg the process of motor and sensory neurons
Microglia
Protect CNS
Ependymal cells
Form Cerebrospinal fluid which fill cavaties and surrounds cushions