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PART ONE
220
24
Anatomy
Undergraduate 2
10/19/2014

Additional Anatomy Flashcards

 


 

Cards

Term
Dual Innervation
Definition
organs are innervated by both sympathetic and parasympathetic neurons
Term
What is a vagus nerve?
Definition
many parasympathetic neurons travel together in the vagus nerve
Term
What are the three types of sensory receptors?
Definition
1. Free Nerve Endings (dendrites)
2. Spinal structure at the end of afferent neuron
3. Seperate specialized cell that synapses with an afferent neuron
Term
What is receptor potential?
Definition
graded potential that occurs in sensory receptors
Term
what is a sensory unit?
Definition
the afferent neuron and all of the sensory receptors attached to it
Term
where are sensory units located?
Definition
the receptive field
Term
What happens after stimulating a sensory receptor?
Definition
1. AP increase along the afferent neuron
2. Enter the spinal cord on dorsal side
-contralateral or ipsilateral
4. goes to thalamus
4. goes to cerebral cortex
Term
Where are the spinothalamic tracts?
Definition
up the spinal cord and to the brain
Term
Define contralateral
Definition
when the AP cross over at the point of entry then go to the thalamus
Term
define ipsilateral
Definition
when AP travel up the spinal cord on the same side and cross over later in the medulla then goto the thalamus
Term
What is the effect of the parasympathetic nervous system on the heart rate?
Definition
SLOWS it
Term
Sympathetic nervous system on pupil size?
Definition
Dilates pupils
Term
Where does the sensory input enter?
Definition
Dorsal side
Term
What do contralateral convey?
Definition
Temperature and pain
Term
What does Ipsilater convey?
Definition
Deep touch
Term
Where is the most sensative part of the receptive field?
Definition
center because it has more receptors than the edges
Term
What is the Law of Projection?
Definition
If sensory pathway is stimulated anywhere along its course, the experienced sensation will be that of the original sensory receptor
Term
What is the thalamus reffered to as?
Definition
Sensory relat station
Term
What three types of info are related by sensory neurons?
Definition
1. Types of stimuli - due to a variety of types of specialized receptors
2. Intensity
A.) # of Sensory units activated (more hurts worse)
B.) By frequency of action potentials (!!!!!!LOUD….! !! ! ! SOFT

3. Localize
Term
What is lateral inhibition?
Definition
When one ascending sensory path inhibits actoin potential frequency in an adjacent path

ex. pressing on thumb when it hurts
Term
Define Facilliation
Definition
One path enhances another
Term
What are the two types of sensory receptors based on prolonged stimuli?
Definition
Phasic and Tonic
Term
What is phasic?
Definition
A type of sensory receptor that decreases action potential frequencies despite constant stimulus?
TOUCH AND ADAPTATION
Term
What is tonic?
Definition
A sensory recepter that has constant action potentials as long as the stimulous is present?
PAIN
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