Brain Structures and Functions

Overview of the Brain

• The brain is a complex organ made up of neurons and glia, organized into distinct lobes that interact for thought and behavior.

The Spinal Cord

• Connects brain and body, acting as a relay for messages.
• Contains automatic processes (reflexes) that act without brain input.
• Organized in 30 segments corresponding to vertebrae.
• Damage can cause paralysis depending on the level of injury.

Neuroplasticity

• Refers to the nervous system's ability to adapt and change after injury.
• Involves creation and pruning of synapses, and even new neuron birth.
• Can occur throughout life, facilitating recovery from injuries.

Hemispheric Specialization

• The brain is divided into left and right hemispheres, connected by the corpus callosum.
• Left hemisphere: language, memory associations, positive emotions.
• Right hemisphere: pitch perception, emotions, spatial abilities.

Brain Functions and Damage

• Behaviors and abilities can be linked to specific brain areas through damage analysis, such as strokes.
• Example: Damage to the frontal lobe can affect motor control and impulse regulation.

Lobes of the Brain

• Frontal Lobe: Involved in reasoning, emotion, language, and motor control.
• Parietal Lobe: Processes sensory information (touch, temperature).
• Temporal Lobe: Associated with hearing, memory, emotion, and language comprehension.
• Occipital Lobe: Responsible for processing visual information.

Limbic System

• Comprises structures involved in emotion and memory (hippocampus, amygdala, hypothalamus).
• Regulates emotional responses and memory consolidation.

Brain Imaging Techniques

• CT Scan: Uses X-rays to create images of body structures.
• PET Scan: Monitors brain activity via blood flow with a radioactive tracer.
• MRI: Uses magnetic fields to create detailed brain structures without radiation.
• fMRI: Measures changes in blood flow to assess brain activity over time.
• EEG: Measures electrical activity of the brain for real-time understanding.