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BMS 337 (Neuro) > Lecture 4 > Flashcards

Lecture 4 Flashcards

1
Q
A
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2
Q

Label the structures

A
  1. caudate nucleus
  2. thalamus
  3. lateral geniculate nucleus
  4. medial geniculate nucleus
  5. mesencephalon
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3
Q

Which tract is associated with the lateral geniculate nucleus?

A

Optic Tract

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4
Q

Which tract is associated with the medial geniculate nucleus?

A

Auditory tract

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5
Q

What is the function of the rostral colliculus?

A

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

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6
Q

What is the function of the caudal colliculus?

A

Auditory reflex - startle reflex

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7
Q

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

A

Innervates the dorsal oblique m. - intorsion of the eye

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8
Q

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

A

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

Innervates contralateral dorsal oblique m.

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9
Q

Name the structures

A
  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)
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10
Q

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

A
  1. Pretectal nucleus
  2. Rostral colliculus

(number 5 in the image)

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11
Q

Label the structures

A
  1. tectum
  2. cerebral aqueduct
  3. tegmentum
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12
Q

Label the structures

A
  1. Corpus callosum
  2. Thalamus
  3. Midsaggital midbrain
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13
Q

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

A
  1. Cerebrum
  2. olfactory bulb
  3. corpus callosum
  4. thalamus
  5. hypothalamus
  6. hyophysis
  7. optic chaism
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14
Q

Label the structures

A
  1. Cerebral aqueduct (aka mesensephalic aqueduct)
  2. Tectum
  3. Tagmentum
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15
Q

Label the structures

A
  1. Optic Nerve
  2. Trochlear Nerve
  3. Crus Cerebri
  4. Pons
  5. Pyramid
  6. Trapezoid Body
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16
Q
  1. What kind of tracts make up the crus cerebri?
  2. Where do they terminate?
A

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

17
Q

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

A
18
Q

Label these structures

A
  1. Optic nerve
  2. Abducent nerve - emerges from medulla oblongata
  3. Pyramid
  4. Trochlear Nerve
19
Q

Which muscles are innervated by the oculomotor nerve?

A

Dorsal rectus, Ventral rectus, ventral oblique, medial rectus

20
Q

Which muscles are innervated by the abducent nerve?

A

Lateral rectus and retractor bulbi

21
Q
  1. What are the smooth muslces of the iris?
  2. What are they innervated by?
A
  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.
22
Q
  1. What is the role of the ciliary muscle?
  2. Which cranial nerve innervates the ciliary muscle?
A
  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.
23
Q

What kinds of fibers make up the Oculomotor nerve?

A

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

24
Q

What kind of fibers make up the trochlear nerve?

A

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

25
Q

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

A

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
Q

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

A

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

27
Q

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

A

Medial strabismus, no retraction of the eyeball

BMS 337 (Neuro) (14 decks)

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