Test 2 Review (Part 1)

Question 1

Which tract is responsible for unconscious proprioception? Which part of the brain receives this information?

Answer 1

Spinocerebellar –> cerebellum

Question 2

What type of cutaneous mechanoreceptor is responsible for fine touch (eg. reading braille)?

Answer 2

Merkel cells

see photo - Chancellor Merkel is finely touching her fingertips together

Question 3

What type of cutaneous mechanoreceptor is responsible for grip control?

Answer 3

Meissner corpuscles

Question 4

What type of cutaneous mechanoreceptor is responsible for vibration sensation?

Answer 4

Pacinian corpuscles

Question 5

What neuronal fiber types are responsible for pain and temperature sensation?

Answer 5

A-delta and C fibers

Question 6

What are the indications for tPA use?

Answer 6

Person over 18 w/ stroke symptoms with no hemorrhage on CT, less than 4.5 since the patient was last seen doing well

-there are a bunch of exclusion criteria

Question 7

What are the contraindications/exclusion criteria for giving tPA to someone?

Answer 7

1. Head trauma
2. Stroke within the last 3 months
3. Arterial punture within the last week
4. Surgery within last 2 weeks
5. Low platelets or prolonged INR
6. Blood glucose <50mg/dL

Question 8

Which cranial nerve is responsible for the constrictor pupillae muscle and which brainstem nuclei contains cell bodies for the presynaptic parasympathetic fibers? Where is this nuclei located in the brainstem?

Answer 8

CN III

Edinger-Westphal nucleus located in the midbrain

Question 9

Which cranial nerves are involved in the corneal blink reflex?

Answer 9

Afferent - V1 (ophthalmic nerve)

Efferent - VII

Question 10

Which nucleus in the brainstem receives taste fibers from the anterior 2/3 of the tongue? Which cranial nerve are these fibers associated with?

Answer 10

Fibers for taste from anterior 2/3 of tongue hitch rides on the lingual nerve (V3), then chorda tympani (VII) to eventually project onto the nucleus solitarius in the medulla.

Question 11

Which cranial nerves innervate the three major salivary glands? What are the associated brainstem nuclei for these?

Answer 11

CN VII does submandibular and sublingual; superior salivatory nucleus

CN IX does parotid; inferior salivatory nucleus

Question 12

Which cranial nerve innervates the lacrimal gland?

Answer 12

VII

Question 13

What does nucleus ambiguus do? Where it is?

Answer 13

Motor for IX and X

In the medulla

Question 14

What are the vermis and interhemispheric region of the cerebellum mostly responsible for?

Answer 14

Unconscious proprioception and smooth pursuit eye movements.

Question 15

Are the cerebellar tracts for input from the spinal cord ipsilateral, or contralateral?

Answer 15

Ipsilateral!

Question 16

What are the functions of the utricle, saccule, and semicircular canals, respectively?

Answer 16

Utricle and saccule are involved in detecting linear acceleration.

Semicircular canals are involved in detecting rotational acceleration.

Question 17

What clinical exam maneuver tests for benign paroxysmal positional vertigo?

Answer 17

Dix-Halllpyke maneuver