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MS206 > Lab1: Rat Brain > Flashcards

Lab1: Rat Brain Flashcards

1
Q

Is the spinal cord located cordal or rostral to the brain?

A

Spinal cord is cordal to the brain.

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2
Q

A cross-section through the spinal cord is cut in which plane?

A

Coronal.

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3
Q

What is the approximate volume of the rat CNS?

A

3.5mL

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4
Q

State the 3 main differences of the rat brain compared to the human brain.

A
  1. Larger olfactory lobe relative to entire brain
  2. Smaller forebrain relative to whole brain
  3. Less folding
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5
Q

What is the largest crainial nerve visible on the rat?

A

Olfactory nerve.

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6
Q

Why is the olfactory nerve so large in the rat?

A

Connected to whiskers. Helps position the rat in space.

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7
Q

What is the 4th ventricle?

A

CSF-filled cavity from cerebral aqueduct to obex.

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8
Q

What info do each of the Ventral and Dorsal nerve roots carry?

A 
Ventral = motor
Dorsal = sensory
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9
Q

What is the thalamus’ function?

A

Relay system between brain and target organs.

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10
Q

What is the hypothalamus’ function?

A

Maintain homeostasis.

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11
Q

What is the function of the Periaqueductal grey region?

A

Process pain.

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12
Q

What is the functional role of the pons?

A

Contains many important nerves innervating head and face.

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13
Q

What is the corpus callosum?

A

Commisural fibres. Nerve tract connecting brain hemispheres.

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14
Q

What is the corona radiata?

A

Projection fibres (connects cortex with lower parts of brain).

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15
Q

What volume is the rat cerebellum, and so what proportion of the rat CNS does it comprise?

A

1mL. So ~33%.

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16
Q

Compare the density of neurons in the cerebellum compared to the rest of the brain.

A

Cerebellum is more densely packed with neurons.

17
Q

What are the two functions of the flocculus?

A
  1. Input from inner ears to help with balance

2. Keeps eyes centrally positioned

18
Q

Compare white and grey matter.

A
  1. Grey matter = cell bodies + dendrites for proccessing info
    White matter = axons. Allows communication between grey matter and rest of body.
19
Q

Compare the functional difference of the ventral horn and dorsal horn.

A 
Ventral = carries motor info TO body parts
Dorsal = carries sensory info FROM body parts
20
Q

What is the difference between fasciculus cunneatus and fasciculus gracilus?

A 
FC = sensory info from hands
FG = sensory info from feet
21
Q

How does proportion of white to grey matter vary between caudal and rostral regions of spinal cord?

A

More white matter from caudal to rostral (because receiving axons from more body parts as one moves up the body).

22
Q

What is the function of Area Postrema?

A

Controls vomiting.

23
Q

What is the function of the Vermis?

A

Controls body posture and locomotion.

MS206 (10 decks)

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