Diencephalon Flashcards
What are the Anatomical Components of the Diencephalon?
Thalamus
Epithalamus
Subthalamus
Hypothalamus
Thalamus Functions (4)
- Processes sensory inputs
- Relays sensory inputs selectively to areas in the cerebral cortex
- Regulates sleep and consciousness
- Provides sensory feedback to the motor system, basal ganglia, & cerebellum
70-80% of humans have an interthalamic adhesion called?
Massa Intermedia
What divides the thalamus?
Internal Medullary Lamina
How many Major Subdivisions of the Thalamus, what are they?
- Anterior Region
- Ventro Lateral Region
- Medial Region
- Posterior Region (Pulvinar)
[Anterior Thalamic Nuclei]
How many nuclei does it have?
Function?
Where does it receive major input from?
Only One
Uncertain Role, probably with emotions and memory
Receives input from
- Mammillary Nuclei of Hypothalamus
- Presubiculum of the Hippocampal Formation
[Medial Thalamic Nuclei]
How many subdivisions
Where does it receive inputs?
Function?
3 Subdivisions, each with connections to parts of the frontal cortex
Receives inputs from:
- Portions of the Basal Ganglia
- Amygdala
- Midbrain
Memory
How many ventral nuclei are there?
Names?
3
Ventral Anterior Nucleus
Ventral Lateral Nucleus
Ventral Posterior Nucleus
Where does the Ventral Lateral Nucleus receive inputs?
Substantia Nigra
Globus Pallidus
Cerebellum
Where does the Ventral Lateral Nucleus send inputs?
Primary motor cortex and premotor cortex
Function: Ventral Lateral Nucleus
Learning of movements
Where does the Ventral Anterior Nucleus receive inputs?
Substantia Nigra
Globus Pallidus
Where does the Ventral Anterior Nucleus send inputs?
Supplementary Motor Cortex
Function: Ventral Anterior Nucleus
Planning movements
Initiates wanted movements
Inhibits unwanted movements
Where does the Ventral Postero-Medial Nucleus receive inputs?
Solitary Tract
Trigeminal nerve via Trigeminal Lemniscus and Trigeminothalamic Tract
