Exam 3, Ch. VI Flashcards
What is the roof of the midbrain?
Tectum
The tectum is ___ to the cerebral aqueduct
Posterior
Where is the tectum located?
Between diencephalon and pons
The tectum is made up of 4 ___
Collicular bodies
*Channel for CSF exchange is between the ___
3rd and 4th ventricles
What is included in the cerebral peduncles?
- tegmentum
- substantia nigra
- crus cerebri
*4 unique characteristics of the 4th CN
- smallest
- only CN with its apparent origin on the posterior brain stem
- only CN that crosses
- travels the furthest
Where is the apparent origin of the 3rd CN?
Interpeduncular fossa
The superior colliculi deals with ___ reflexes
Visual
The inferior colliculi deals with ___ reflexes
Auditory
Which tract do the colliculi use?
Tectospinal
Lesions don’t impair ___ eye movements, only perception of ___ of objects in the field of vision
Voluntary, motion
*Hearing reflexes deals with the ___ geniculate body
Medial
*Motion reflexes deals with the ___ geniculate body
Lateral
*The nuclei of origin for CN III and IV are located where?
Tegmentum
The reticular formation of the midbrain is located in the ___
Tegmentum
*The red nucleus is divided into a ___ and ___ area
Magnocellar, parvocellular
*The ___ area is the inferior large cell area
Magnocellar
*The ___ area is the highly vascular superior area
Parvocellular
Input fibers come to the red nucleus from
- dentate, globus, emboliform
2. cerebral cortex
What is the function of the red nucleus?
Postural control and muscle tone control primarily in flexor musculature
*The substantia nigra secretes ___
Dopamine
What gives the substantia nigra its black appearance?
Melanin
Afferent and efferent fibers of the SN are exchanged between the ___
Caudate and putamen nuclei
Notes on Parkinson’s Disease
- resting tremor
- inability to produce dopamine
- synthetic dopamine will not cross the BBB, L-Dopa will
What types of fibers make up the crus cerebri?
Descending pyramidal axons
