VI - Subcortex

13 important questions on VI - Subcortex

Where does the basal ganglia lie, and what are they involved in?

The basal ganglia are round masses that lie in each hemisphere.
They surround and overhang the thalamus.

They are involved with motor activity, programming and terminating of action. (Skill and reward learning)

What are the main structures of basal ganglia, and what are disorders of the basal ganglia characterized as?

The main structures comprising the basal gangia are:
  1. the caudate nucleus,
  2. the putamen
  3. globus pallidus.


Disorders of the basal ganglia can be characterized as:
hypokinetic (povery of movement) or
hyperkenetic movements (excess of movement)


    

How does the caudate nucleus work in the basal ganglia, and what are examples of hypo/hyperkinetic movement?

the caudate and putamin funnel cortical inputs into the globus pallidus from which the fibers reach into the thalamus. Circuits passing through these regions increase or decrease the probabilty and intensity of certain behaviours.

Examples of hypok/hyperkinetic movement is Parkinson and Huntington's disease
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What is the amygdala implicated in and where do the amygdala and hippocampus lie?

The amygdala has been implicated in the detection of fearful and threatening stimuli.

Both the amygdala and hippocampus lie buried in the temporal lobes of each hemisphere.

Where do the mammilary bodies lie and what is their function?

The mamillary bodies are two small round protusions that have traditionally been implicated in memory.

Why is the olfactory bulb connected to the limbic system, and where do the olfactory bulbs lie?

The olfactory bulbs lie on the under-surface of the frontal lobes.

Their connection to the limbic system underscore the importance of smell for detecting environmentally salient stimuli and its influence on mood and memory. 

What do tumors in the hypothalamus cause?

Tumors in the hypothalamus can lead to eating, drinking disorders, precocious puberty, dwarfism and gigantism

Which two grey matter structures belong in the midbrain and what do they provide?

The superior and inferior colliculi are grey matter structures in the midbrain.

They are older pathways different form the main cortical sensory pathways. They provide a fast route that enables rapid orienting to sensory stimuli before it is conciously processed.

  • The superior colliculli processes vision, hearing and touch.
  • The interior colliculli processes auditory processing.   

What other region does the midbrain have and what does cell loss in this region cause?

The midbrain contains a region called substantia niga which is connected to the basal ganglia.

Cell loss in this region is associated with symptoms of Parkinson.  

Where is the cerebellum attached to and what is it important for?

The cerebellum is attached to the hindbrain via cerebellar penducules. It's a highly convulated fold of gray matter organised in two interconnected lobes.

It's important for dexterity and smooth execution of movement.

How does the cerebellum create dexterity and movement and what happens when there's unilater lesions in the cerebellum?

The cerebellum achieves movement by integrating motor commands with online sensory feedback about the state of actions.

Unilateral lesions to the cerebellum result in poor coordination in the same side oof the body.

What does bilateral lesions to the cerebellum cause and what is the pons?

Bilateral lesions to the cerebellum cause gait, slurred speech and eye moving movement nystagmus.

The pons is a key link between the cerebellum and cerebrum.  

What does the pons do and what portrudes from the pons and merges with the spinal cord?

The pons is responsible for receiving information from visual areas to control eye and body movement.

The medullate oblongata protrudes from the pons and merges with the spinal cord. It regulates vital functions such as breathing, swallowing heart rate and wake-sleep cycle.

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