Exam 3, Ch. VI

Question 1

What is the roof of the midbrain?

Answer 1

Tectum

Question 2

The tectum is ___ to the cerebral aqueduct

Answer 2

Posterior

Question 3

Where is the tectum located?

Answer 3

Between diencephalon and pons

Question 4

The tectum is made up of 4 ___

Answer 4

Collicular bodies

Question 5

*Channel for CSF exchange is between the ___

Answer 5

3rd and 4th ventricles

Question 6

What is included in the cerebral peduncles?

Answer 6

1. tegmentum
2. substantia nigra
3. crus cerebri

Question 7

*4 unique characteristics of the 4th CN

Answer 7

1. smallest
2. only CN with its apparent origin on the posterior brain stem
3. only CN that crosses
4. travels the furthest

Question 8

Where is the apparent origin of the 3rd CN?

Answer 8

Interpeduncular fossa

Question 9

The superior colliculi deals with ___ reflexes

Answer 9

Visual

Question 10

The inferior colliculi deals with ___ reflexes

Answer 10

Auditory

Question 11

Which tract do the colliculi use?

Answer 11

Tectospinal

Question 12

Lesions don’t impair ___ eye movements, only perception of ___ of objects in the field of vision

Answer 12

Voluntary, motion

Question 13

*Hearing reflexes deals with the ___ geniculate body

Answer 13

Medial

Question 14

*Motion reflexes deals with the ___ geniculate body

Answer 14

Lateral

Question 15

*The nuclei of origin for CN III and IV are located where?

Answer 15

Tegmentum

Question 16

The reticular formation of the midbrain is located in the ___

Answer 16

Tegmentum

Question 17

*The red nucleus is divided into a ___ and ___ area

Answer 17

Magnocellar, parvocellular

Question 18

*The ___ area is the inferior large cell area

Answer 18

Magnocellar

Question 19

*The ___ area is the highly vascular superior area

Answer 19

Parvocellular

Question 20

Input fibers come to the red nucleus from

Answer 20

1. dentate, globus, emboliform

2. cerebral cortex

Question 21

What is the function of the red nucleus?

Answer 21

Postural control and muscle tone control primarily in flexor musculature

Question 22

*The substantia nigra secretes ___

Answer 22

Dopamine

Question 23

What gives the substantia nigra its black appearance?

Answer 23

Melanin

Question 24

Afferent and efferent fibers of the SN are exchanged between the ___

Answer 24

Caudate and putamen nuclei

Question 25

Notes on Parkinson’s Disease

Answer 25

1. resting tremor
2. inability to produce dopamine
3. synthetic dopamine will not cross the BBB, L-Dopa will

Question 26

What types of fibers make up the crus cerebri?

Answer 26

Descending pyramidal axons