Anatomy Smeester 2 Final
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24 terms
Terms | Definitions |
|---|---|
 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 |
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