Homework&worksheets

The image below shows the receptive fields for Meissner’s corpuscles and Pacinian corpuscles of the hand.  What is a receptive field? If the Pacinian corpuscle has a large receptive field does that mean it is easy or hard to localize touch with the Pacinian corpuscles on the finger?

A receptive field is a patch of skin that is innervated by a sing touch receptor neuron. If Pacinian corpuscles have large receptive fields it would be difficult to localize touch because each single neuron innervates a large parch of skin.

The following quote comes from a New York Times newspaper article. Explain what this article is talking about.

“Where does it hurt? In your right shoulder blade? Could it be bursitis or tendinitis? Should you see an orthopedist, physiatrist or physical therapist? A gastroenterologist might actually be a better bet, because the real cause of that shoulder pain could be a liver ailment or gallbladder disease or some other abdominal disorder. “

This is talking about referred pain.

* Pain fibers from internal organs travel together with fibers from skin thus it is difficult to locate the source of pain from internal organs

What type of receptor responds to tickle/itch?

Free nerve endings

What is the difference between a free nerve ending and a corpuscle?

Free nerve endings are not encaputlated and doesnt pick up vibrations like corpuscles

The trigeminal nerve is the largest and most complex of the 12 cranial nerves (CNs). It supplies sensations to the face, mucous membranes, and other structures of the head. It is the motor nerve for the muscles of mastication and contains proprioceptive fibers. 

Look up Trigeminal Neuralgia. What is it and which of the three branches are most likely to be affected?

TN involves painful sensations in the face due to irritation or damage to CN 5

* TN most often involves pain in jaw, teeth, or gums and is less commonly felt in the eye region.
* If pain involves jaw only the the mandibular and maxillary divisions of SN 5 are involved
* Pain to ete region caused by irritation of opthalmic division

Label

Review Different Pathwats

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What types of informatinare carried by free nerve endings

Pain, Temp, and Tickle/itch

Go over pathways

Go over neurons and their touches

Define Nociceptor

a __sensory__ __receptor__ for painful __stimuli__.

Force applied to one side of the PC triggers the opening of mechanically gated sodium channels and Na+ ions move into corpuscle. This depolarzation event triggers and AP down length of axon and you “know” that pressure is applied to that area

What is the name of the bony plate labeled “A” in this image?

 

 

b) What is the function of the mucus layer?

 

 

c) What is the function of the cilia on this image?

What is the ultimate destination for the sense of smell?

* THe olfactory cortex
* tyhe limbic system

What is the function of a taste pore

Tase hair sit in taste pore/ Taste porte fills with salica which helps taste receptos ind sweet sour umami and bitter and salt

Which cranial nerve is involved in emotional tear production at the movies>

7

What is the blink (or corneal) reflex? Which cranial nerve mediates the sensory component o the blink reflex

Cranial nerve 5 is the sensory for feeling someting in your eye and CN 7 closes it

In the dark, retinal, in the cis conformation, leads to a constant production of cGMP and the Na+ Ca++ channels stay open. The cells is depolarized and its RMP is approximately -40 mV. In the light, the retinal changes to the trans conformation which block the production of cGMP and the ion channels close. The cell becomes hyperpolarized as the potential drops  to -70 mV.

be photosensitive pigment derived from vitamin A is

Retinal

On a dark night, the rods have a high concentration of

A)opsin.

B) cGMP

C)cAMP.

D)kinase.

B) cGMP

Why are muscle cells multinucleated?

Bc during embyonic development individual muscle cells merge

Function of titin, M-line and Z line

Titin- secures myosin in place and prevents muscle fro over stretching

m-line - holds mhyosin in place

Z-line - helps actin slide as a single unit

What is rigor mortis and what causes this to happen?