Brain Analysis – Part 1

Brain

Brain Analysis

1.1 Hippocampus

The hippocampus is an S-shaped structure located in the central region of the temporal lobe, identifiable as a densely packed layer of neurons.

The hippocampus is divided into three regions: CA1, CA2, and CA3. These regions form the trilaminar loop, which is the center of long-term memory processing. Long-term potentiation (LTP), a form of neural plasticity, occurs in the hippocampus, and LTP is a vital brain mechanism involved in memory storage.

The complex processes of memory encoding in the hippocampus and the retrieval of experiences from the frontal lobe involve two prominent pathways: polysynaptic and direct pathways. The polysynaptic pathway is important for semantic memory (facts and concepts), while the direct pathway is important for episodic memory (recall of events) and spatial memory (recognition).

1.2 Amygdala

The amygdala is part of the so-called deep brain, where basic emotions such as anger and fear, as well as survival instincts, are processed.

It is responsible, for example, for making us more adaptable than any close evolutionary relative. It allows us to escape risky or dangerous situations, but it is also what makes us remember childhood traumas and everything that caused us suffering at some point.

The cerebral amygdala has a direct relationship with anxiety disorders. Neuroscientists have found that some people have a larger amygdala, which increases the risk of mood disorders.

We know that the human amygdala can extract information extremely quickly about what surrounds us, detecting risks and threats (even if they are not necessarily real).

In a short time, the feeling of fear is activated to promote escape or defense. Later, this feeling of fear and alertness also reaches the dorsal anterior cingulate cortex (located in the frontal lobe). This structure amplifies the feeling of fear and blocks more rational thoughts, because at that moment, emotion dominates the brain—specifically distress—and it pushes us to react.

1.3 Prefrontal Cortex

The prefrontal cortex is responsible for functions related to:

• Attention

• Judgment

• Perseverance

• Impulse control

• Organization

• Self-monitoring

• Problem-solving

• Critical thinking

• Anticipation

• Learning from experience

• Feeling and expressing emotions

• Interaction with the limbic system

• Empathy

  
  

When there are dysregulations in this area, patients may present various complaints affecting cognitive, emotional, and social abilities, such as:

• Difficulty maintaining attention

• Easy distraction

• Lack of perseverance

• Problems controlling impulses

• Hyperactivity

• Chronic lateness / time management difficulties

• Disorganization

• Procrastination

• Emotional difficulties

• Frequent misunderstandings

• Poor judgment

• Difficulty learning from experience

• Short-term memory problems

• Social and performance anxiety

  
  

1.4 Occipital Cortex

It analyzes distances relative to our position, movement, and size, and also processes light (color).

This is something we do unconsciously and involves highly sophisticated neurological processing with absolute precision. The occipital lobe allows us to move effectively in our daily lives. It is small but highly specialized and efficient.

Our understanding of the world is based almost entirely on vision. The occipital lobe continuously processes visual stimuli, analyzing distances, shapes, colors, and movement.

1.5 Cerebellum

Known for maintaining body balance and controlling the activities of various muscle groups.

1.6 Brainstem

Connects the brain (including the brainstem, cerebellum, and cerebrum—the upper part of the central nervous system that controls the body) to the spinal cord.

1.7 Nervous System

This system includes the distribution of nerves associated with the different parts of the nervous system.

The brain and spinal cord form a unit that constitutes the axis through which the nervous system coordinates the entire human body. This is the neuroaxis, or central nervous system.

It directs the functions of the internal organs, regulates gland activity, and, through numerous receptors, captures sensations from the external world or the body itself, preparing responses to those sensations.

While one part of the nervous structure (central and peripheral nervous systems) connects the individual to the environment, another part maintains the body's functioning, controlling vegetative or visceral life. The first is the somatic portion, and the second corresponds to the autonomic nervous system (also known as the sympathetic system), since internal organ function operates independently of conscious control.

Highly specialized cells can detect external stimuli such as heat, cold, and pain (irritability) and conduct these stimuli throughout the body as nerve impulses (conductivity). These functions are exclusive to numerous neurons.

In the structure of the nervous system, neurons are all connected, forming neural chains. Through these chains, nerve impulses travel and are transmitted. The connection between neurons, called a synapse, occurs between the axon terminal of one cell and the dendrites or cell body of another. The impulse travels from the cell body to the axon. The synapse acts as a “switch” that turns communication between nerve cells on or off.

1.8 Hypothalamus

The hypothalamus includes intracranial structures such as the mammillary bodies, tuber cinereum, infundibulum, neurohypophysis, optic tracts, optic chiasm, and terminal lamina. It is considered the highest center of vegetative functions in the brain. From it originate impulses that influence neurons of the autonomic nervous system, which regulates visceral tissues such as smooth muscle, cardiac muscle, glands, kidneys, and other organs.

As a controller of the autonomic system, the hypothalamus plays a role in numerous bodily functions, including temperature regulation, pituitary control, metabolism, blood circulation, emotional states, sleep-wake cycles, and possibly many other functions, including psychosomatic processes. It also influences heart rate and blood pressure.

In addition to physiological factors, psychological factors can also stimulate urination. Many people, when experiencing strong emotions such as anxiety or fear, may have urinary accidents.

Beyond these known disturbances, hypothalamic lesions may cause severe conditions such as epileptic seizures, feminization in men, masculinization in women, and many other disorders that are not yet fully understood.