Midbrain Flashcards
What is the primary function of the midbrain?
The midbrain connects the hindbrain to the forebrain.
What structures are included in the midbrain?
Reticular formation and substantia nigra.
What is the reticular formation?
A network of neurons extending from the medulla into the midbrain involved in various functions.
List three functions of the reticular formation.
- Muscle tone
- Eye movements
- Control of pain
What is the reticular activating system (RAS)?
A portion of the reticular formation that plays a role in mediating consciousness and arousal.
What does the RAS control?
What can lesions in the RAS cause?
A comatose state.
How can a sleeping person be awakened?
Through direct electrical stimulation or stimulation by sensory input.
What role does the substantia nigra play?
reward-seeking, drug addiction, and motor control.
What causes the motor symptoms associated with Parkinson’s disease?
Degeneration of dopamine-producing cells in the substantia nigra.
True or False: The substantia nigra is sometimes considered part of the basal ganglia.
True.
