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Lecture 8 APP
Neurology
| Question | Answer |
|---|---|
| What organs are catergorized in the CNS? | Brain and Spinal Cord |
| The grey matter contains... | site of neuron cell bodies & synapses |
| The white matter contains... | nerve tract |
| What are the parts of the brain? | cerebrum, cerebellum, pons& medulla, midbrain, and diencephalon |
| How many cranial nerves are in the brain? | 12 |
| Where does the spinal cord extend through? | cranial, thorasic, lumbar, and saccral region |
| How many spinal nerves are there? | 31 |
| What organs in the PNS? | spinal, cranial nerves and ganglia |
| Sensory fibers of the PNS travel in what direction? | afferent |
| Motor fibers of the PNS travel in what direction? | efferent |
| What components are composed of the neuron? | cell body, dentrite, and axon |
| What is the cell body of a neuron called and what is its function? | it is called a soma and is responsible for metabolic functions |
| What are dendrites? | receptors of synaptic connections- from hundreds to hundreds of other neurons |
| What is an axon? | transmitting process that may have few to many processes |
| What causes the transmission to be one way from axon of inpt cell to dentrite of output cell | because of the properties of synaptic connection |
| What do somatosensory receptors respond to? | sensory receptors respond to stimuli |
| what is the pathway of somatosensory receptors? | pass through spinal cord nerves or brain nerves |
| somatosensory axis | sensory receptors respond to stimuli |
| what is the path of somatosensory axis | pass signals to spinal cord (spinal nn.) or brain (cranial nn.) where is the sensory info from somatosensory axis |
| what is the direction of the sensory info in somatosensory | nerve tracts in cord are ascending |
| what is the motor axis | skeletal muscle responds to output from a- motor neurons of anterior horn of cord grey matter |
| where does motor axis signals originate | output signals originate from cord, from reticular substance of medulla, pons & midbrain, from basal ganglia, from cerebellum, & from cerebral cortex |
| what is the direction of the sensory info for motor | nerve tracts in cord are descending |
| what is integrative component | involves screening out majority of sensory signals (thalamus) |
| what plays a major role in integtative components | synapses play major role in controlling input signals screening many & amplifying others through mechanisms of facilitation & inhibition |
| stored sensory inputs (memory) reside mainly in the cerebral cortex | also a function of synapses |
| what repeated sensory inputs | may facilitate a certain sequence of synapses to such a level of sensitivity that other signals in the brain my excite the same sequence of synapses, independent of any sensory input |
Created by:
lisamarie9
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