3.3

3.3 a: Know the key terminology associated with the structure and organization of the nervous system.
3.3 b: Understand how studies of split brain patients reveal the workings of the brain.
3.3 c: Apply knowledge of brain regions to predict which abilities might be affected when a specific area is injured or diseased.
3.3 d: Analyze whether neuroplasticity will help people with brain damage.

The narrative starts with the story of Dr. Wilder Penfield at the Montreal Neurological Institute, who used electrical stimulation of the brain prior to surgery to treat seizures.
- Purpose: This mapping provided insight into the location of important brain areas, particularly those associated with language and sensation.
- Example Patient Experience: The patient described various sensations, notably the smell of burnt toast, during stimulation of different brain areas, highlighting the organization of brain functions.

Perspective: Billions of neurons work together, allowing for the complexity of personality, movement, sensations, and various involuntary processes (e.g., heartbeat, breathing).
Divisions of the Nervous System: The nervous system is differentiated into Central Nervous System (CNS) and Peripheral Nervous System (PNS).

Components:
- Brain: The complex organ containing approximately 100,000,000,000 neurons, responsible for personality, memory, and conscious awareness.
- Spinal Cord: Extends from the neck to the base of the spine, facilitating communication between the body and brain, controlling movement and relaying sensory information.

Function: Transmits signals between the CNS and the rest of the body.
Subcomponents:
- Somatic System: Controls voluntary movements and sensory input.
- Autonomic System: Governs involuntary processes, further divided into:
  - Sympathetic Nervous System: Increases arousal, responsible for the fight-or-flight response.
  - Parasympathetic Nervous System: Regulates rest and digestion, restoring the body to a calm state after stress responses.

Divisions of the Brain: The brain can be divided into three main regions: Hindbrain, Midbrain, and Forebrain.

Brain Stem: Comprising the medulla (regulates vital functions like breathing and heart rate) and the pons (involvement in wakefulness and dreaming).
Cerebellum: Coordinates movement, balance, and attention; damage leads to uncoordinated movements and emotional control issues.

Function: Acts as a relay station for sensory and motor pathways.
Key Structures:
- Superior Colliculus: Involved in visual attention.
- Inferior Colliculus: Involved in auditory attention.
- Substantia Nigra: Critical for movement control and implicated in Parkinson’s disease due to the loss of dopamine-producing cells.

Components: Structures above the midbrain critical for complex processes.
- Ventricles: Contain cerebrospinal fluid for cushioning and nutrient supply.
- Basal Ganglia: Facilitates planned movement and skill learning; dysfunctions lead to disorders like Parkinson's and Huntington's disease.
- Limbic System: Involved in emotion and memory, including structures like the amygdala (fear memory) and hippocampus (formation of new memories).
- Hypothalamus: Regulates homeostasis, interactions with the endocrine system, and triggers physiological states related to various drives (e.g., hunger, aggression).
- Thalamus: Sensory relay center directing information to appropriate brain regions.
- Cerebral Cortex: Involved in higher functions including thought, language, and personality. Its convoluted structure increases surface area for more neural connections.

Occipital Lobes: Involved in visual processing; connects with parietal and temporal lobes for object recognition and movement guidance.
Parietal Lobes: Manage touch and bodily awareness; damage can result in conditions like neglect.
Temporal Lobes: Control hearing, language comprehension, and memory; includes Wernicke’s area for language understanding.
Frontal Lobes: Responsible for higher cognitive functions, motor control, and decision-making; the primary motor cortex and prefrontal cortex contribute to voluntary movement and executive functions, respectively.

Corpus Callosum: Connects the two hemispheres, facilitating communication and functional integration.
Left Hemisphere: Specialized for language and logical tasks.
Right Hemisphere: Associated with spatial abilities and creative tasks.
Split Brain Patients: Offer insights into the distinct functions of each hemisphere; for instance, processing visual information differently based on where it appears on the visual field.
- Example: An object shown to the right can be verbalized, but shown to the left can only be identified by touch.

Definition: Neuroplasticity is the brain's ability to reorganize and adapt in response to experience and injury.
Examples in Action: Brain areas, particularly the occipital lobes, can process non-visual stimuli when visual functions are not needed, as seen in blind individuals, who utilize these areas for touch and hearing.
Implications for Recovery:
- After brain damage, recovery is possible as undamaged areas can take over functions; rehabilitation emphasizes neural reorganization.
- Melodic Intonation Therapy can rehabilitate speech areas affected by strokes, allowing the right hemisphere to compensate for lost functions.

The understanding of the brain's architecture and capabilities, especially regarding neuroplasticity, sheds light on recovery options for brain injuries. It opens avenues for innovative approaches to treatment, underlining the significant potential for rehabilitation in affected individuals.

Knowledge of terminology related to the structure and organization of the nervous system.
Understanding insights from split brain studies regarding hemispheric specialization.
Application of knowledge to predict outcomes from brain area damage.
Analysis of neuroplasticity's role in recovery from brain damage and implications for future treatment strategies.