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Organization of the Peripheral Nervous System
PNS
13
Health Care
Graduate
10/17/2015

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Cards

Term
What are the four functional regions on a neuron?
Definition
Input
Integrative
Conductive
Output
Term
What are the three plexuses and what segments make up each?
Definition
Brachial (C5-T1), lumbar (L1-L4), sacral (L5-S4
Term
What are the three connective tissue layers of a spinal nerve and what levels are each located?
Definition
Endoneurium (smallest layer), perineurium (middle layer), epineurium (outside layer)
Term
What is stimulus transduction?
Definition
Process by which stimulus energy is converted into an electrical signal
Term
Exteroreceptors
Definition
Sensitive to stimulus arising from outside the body
Term
Interoreceptors (visceroreceptor)
Definition
Responsive to stimulus arising from the viscera
Term
Where do free nerve endings end?
Definition
stratum granulosum
Term
What kink of receptor is a Meissner's corpuscle, what are they sensitive to, and where do they live?
Definition
It is a mechanoreceptor sensitive to light touch and it hangs out in the superficial dermis. They are also rapid adapting.
Term
What are pacinian corpuscles sensitive to?
Definition
Deep pressure
Term
Ruffini's corpuscles are sensitive to...
Definition
Pressure
Term
Where are Merkel discs located and what are they sensitive to?
Definition
Epidermis and are sensitive to light touch
Term
What do intrafusal fibers do?
Definition
respond to degree and rate of stretch
Term
What is the difference in feedforward and feedback mechanisms in the peripheral nervous system.
Definition
Feedback can only respond to the present stimulus. For instance, it is used to maintain position of limbs to hold an object.
Feedforward uses anticipatory control, and is used in rapid movment. The CNS uses feedforward in order to predict consequences. Feed-forward can modify spinal response.
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