Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

CNS > Unit 6 > Flashcards

Unit 6 Flashcards

1
Q

Areas of the midbrain

A
  • Tectum
  • Cerebral aqaeduct (of sylvius)
  • Cerebral peduncles
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

“Roof” of the midbrain; in this case a posterior roof

A
  • Tectum
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

The tectum is ____ to the cerebral aqueduct

A
  • Posterior
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is the Tectum composed of?

A
  • Quadrigeminal plate made up of 4 collicular bodies (2 superior and 2 inferior
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Channel for CSF exchange between the 3rd and 4th ventricles

A
  • Cerebral Aqueduct
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Surrounds the cerebral aqueduct

A
  • Periaqueductal gray substance
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is present in the preiaqueductal gray?

A
  • Nuclei from CNs 3 and 4
  • Endorphins
  • Enkephalins
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is ventral to the cerebral aqueduct?

A
  • Cerebral peduncles
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What do the cerebral peduncles include?

A
  • Tegmentum (ventral to the aqueduct)
  • Substantia Nigra (toward the middle)
  • Crus Cerebri (ventral and lateral aspect)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Smallest of the CNs

A
  • CN IV
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What does CN IV innervate?

A
  • Superior Oblique
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Apparent origin of CN IV

A
  • Out of the mid-dorsal aspect just inferior to the inferior colliculus
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Apparent origin of CN III

A
  • Ventral from the interpeduncular fossa

- The 6 nuclei of origin are located in the pariaqueductal gray substace area

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Fibers from which nucleus contribute preganglionic parasymapthetic fibers to CN III?

A
  • Edinger-Westphals’ nucleus (of the midbrain)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

4 bumps exist in the mamalian tectum called what?

A
  • Superior and inferior colliculi
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

The superior colliculi deals with what reflexes?

A
  • Some visual
17
Q

The inferior colliculi deals with what reflexes?

A
  • Some auditory
18
Q

Both sets of colliculi utilize which tract for proprioceptive reflexes which allows us to move our head away from loud sounds and also objects moving rapidly in our field of vision?

A
  • Tectospinal
19
Q

The tectospinal tract influences the neurons in the upper cervical through CN __, which contracts what muscles to prevent head injury?

A
  • XI

- SCM, and trapezius

20
Q

Lesions in the tectum don’t impair voluntary eye movemtns, but the do impair what?

A
  • Perception of motion of objects in the field of vision
21
Q

Area just ventral to the cerebral aqueduct

A
  • Tegmentum
22
Q

What is located in the tegementum?

A
  • Nuclei of origin for CNs III and IV
  • Reticular formation of the midbrain
  • Nucleus Ruber (Red nucleus)
23
Q

Although the nucleus ruber is primarily in the midbrain, the superior part extends where?

A
  • Diencephalon’s subthalamic region
24
Q

What is the red nucleus divided into?

A
  • Magnocellular area (Inferior large cell area)

- Parvocellular (Highly vascular superior area)

25
Q

What tract fibers originate in the megnocellular area of the midbrain?

A
  • Rubrospinal
26
Q

Input fibers that go into the red nucleus

A
  • The central cerebellar nuclei (except the fastigial)

- Cerebral cortex

27
Q

Functions of the nucleus ruber

A
  • Contralateral motor responses necessary for postural control and muscle tone control primarily in flexor musculature
28
Q

Where is the substantia nigra located?

A
  • Between the tegmentum and the crus
29
Q

Where does the substantia nigra extend into?

A
  • Subthalamus of the diencephalon
30
Q

What gives substantia nigra its black appearance?

A
  • Melanin
31
Q

What are afferent and efferent fibers of the substantia nigra exchanged between?

A
  • The telecephalon’s caudate and putamen nuclei
32
Q

What does the caudate and putamen nuclei make up most of?

A
  • Basal ganglia (corpus striatum) of the Cerebellum
33
Q

What was Parkinson’s DIsease first called?

A
  • Paralysis agitans
34
Q

Symptoms of Parkinson’s Disease

A
  • Shaking of digits, hands, and tongue at rest
  • Odd postures (flexing forward)
  • Pain
  • Shuffling gates
  • Loss of speech in later stages
35
Q

Parkinson’s Disease is associated with what?

A
  • A drop in dopamine in the Substantia Nigra
36
Q

Ventrolateral aspect of the cerebral peduncle

A
  • Crus Cerebri
37
Q

The Crus Cerebri is composed of descending tracts of fibers from the Cerebral Cortex. Some examples are:

A
  • Corticospinal fibers (to the cord)
  • Corticopontine fibers (to the pons)
  • Corticobulbar fibers (to the M.O.)
38
Q

These axons terminate on CN nuclei 3 and 4 to initiate voluntary motor movements of the eyes

A
  • Corticomesencephalic fibers

CNS (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions