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Flashcards in Lecture 4 Deck (27):
1

2

Label the structures

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1. caudate nucleus

2. thalamus

3. lateral geniculate nucleus

4. medial geniculate nucleus

5. mesencephalon

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3

 

 

Which tract is associated with the lateral geniculate nucleus?

 

 

Optic Tract

4

 

 

Which tract is associated with the medial geniculate nucleus?

 

 

Auditory tract

5

 

 

What is the function of the rostral colliculus?

 

 

Visual Reflexes - pupillary dilation, turning the head and blinking the eyes in response to visual stimulation

6

 

 

What is the function of the caudal colliculus?

 

 

Auditory reflex - startle reflex

7

 

What is the function of the trochlear nerve? (IV)

 

 

Innervates the dorsal oblique m. - intorsion of the eye

8

 

 

Where does the trochlear nerve emerge?  Which side of the body does it innervate?

 

 

Emerges from the dorsal midbrain at the caudal surfcace of the caudal colliculi.

 

Innervates contralateral dorsal oblique m.

9

Name the structures

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1. Rostral colliculus

2. Caudal colliculus 

3. Trochlear Neve (IV)

4. origin of CN IV

5. Pretectal nucleus (I don't think we have to be able to ID that one but I put it on just in case)

10

 

 

Which nucleus is responsible for pupillary constriction?  On which structure is it found?

1. Pretectal nucleus

2. Rostral colliculus

(number 5 in the image)

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11

Label the structures

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1. tectum 

2. cerebral aqueduct 

3. tegmentum

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12

Label the structures

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1. Corpus callosum

2. Thalamus

3. Midsaggital midbrain

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13

Label the structures (sorry to put so many on 1)

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1. Cerebrum

2. olfactory bulb

3. corpus callosum

4. thalamus

5. hypothalamus

6. hyophysis

7. optic chaism

14

Label the structures

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1. Cerebral aqueduct (aka mesensephalic aqueduct)

2. Tectum

3. Tagmentum

 

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15

Label the structures 

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1. Optic Nerve

2. Trochlear Nerve

3. Crus Cerebri

4. Pons

5. Pyramid

6. Trapezoid Body

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16

1. What kind of tracts make up the crus cerebri?

2. Where do they terminate?

 

 

The crus cerebri is made of the descending motor tracts of the cerebral cortex that terminate in the brainstem or spinal cord.

17

Trace a sensory signal through the midbrain and fill in the blank.

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18

Label these structures

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1. Optic nerve

2. Abducent nerve - emerges from medulla oblongata

3. Pyramid

4. Trochlear Nerve

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19

 

 

Which muscles are innervated by the oculomotor nerve?

 

 

Dorsal rectus, Ventral rectus, ventral oblique, medial rectus

20

 

 

Which muscles are innervated by the abducent nerve?

 

 

Lateral rectus and retractor bulbi

21

 

1. What are the smooth muslces of the iris? 

2. What are they innervated by?

1. Pupillary spincter muscle and pupillary dilator muscle

2. The pupillary sphincter m. is innervated by the oculomotor nerve.  The pupillary dilator m. is innervated by sympathetic fibers.

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22

1. What is the role of the ciliary muscle?

2. Which cranial nerve innervates the ciliary muscle?

1. Contraction fo the ciliary muscle allows the lens to change in response to visual stimuli in order to focus

2. It is innervated by the oculomotor nerve.

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23

 

 

What kinds of fibers make up the Oculomotor nerve?

 

 

Somatic and visceral fibers - this means that 2 SEPARATE nuclei give rise to CN III

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24

 

 

What kind of fibers make up the trochlear nerve?

 

 

CN IV is made up of ONLY somatic fibers (inn. skeletal muscle)

25

 

 

What clinical signs would you see with damage of the oculomotor nerve?

Ventrolateral strabismus 

Pupillary Dilation

Drooped eyelid

The neuro program is really good practice for this stuff, I think he'll probably ask a lot of questions like this.

26

 

 

What would you expect to see with a lesion of the trochlear nerve?

 

 

Extorsion of the eyeball - very difficult to tell with dogs since they have a round pupil, easier to tell on cats.

27

 

 

What clinical signs would you expect to see from a lesion of the abducent nerve?

 

 

Medial strabismus, no retraction of the eyeball