He human brain Is the central organ of the nervous system, located in the head of the human being and protected by the skull.
It has the same general structure and anatomy as the brain of other mammals, but with a more developed cerebral cortex.
Larger animals such as whales or elephants have larger brains in absolute terms, but when measured using The encephalization coefficient , Which compensates for the size of the body, the coefficient of the human brain is almost twice as large as that of the common dolphin and three times larger than that of the chimpanzee.
The majority of the expansion is due to the Cerebral cortex , Especially of the Frontal lobes , Which are associated with executive functions such as reasoning, planning, self-control, and abstract thinking.
The visual cortex, the part of the cerebral cortex dedicated to vision, is also broader in humans.
Parts of the brain and their characteristics
Much of the physiological functions of the brain involve receiving information from the rest of the body, interpreting it, and guiding the body's response. AND S the ultimate responsible for the thought and movement that the body produces.
The types of stimuli that the brain interprets include sounds, light, smells, and pain.
The brain also intervenes in vital operations such as breathing, releasing hormones or maintaining blood pressure.
It allows humans to successfully interact with the medium by communicating with others and interacting with inanimate objects.
The brain is composed of nerve cells that interact with the rest of the body through the spinal cord And the nervous system.
In addition, in the brain are several chemical compounds that help the brain maintain its homeostasis.
Keeping nerve cells functioning properly and chemicals balanced is essential for brain health.
The main parts of the brain will be discussed below.
Cerebral cortex
It is the integrating part of afferent and efferent information.
The cortex is almost symmetrical and is divided into the right hemisphere and the left hemisphere.
Conventionally, scientists have divided it into 4 lobes: frontal, parietal , occipital Y temporary .
However, this division is not by the actual structure of the cerebral cortex, but by the bones of the skull that protects it.
The only exception is that the frontal and parietal lobe are separated by the central sulcus, a fold where the primary and motor somatosensory cortex are joined.
The different areas of the cerebral cortex are involved in different behavioral and cognitive functions.
Frontal lobe
The frontal lobe is one of the 4 lobes of the cerebral hemisphere.
This lobe controls various functions such as problem solving, creative thinking, judgment, intellect, attention, behavior, physical reactions, abstract thinking, coordinated movements, coordinated muscles, and personality.
Parietal lobe
This lobe focuses on movement, calculation, orientation and certain types of recognition.
If an injury occurs in this area, you may have disabilities to do simple daily tasks.
In the parietal lobe you can find:
- The motor cortex: allows the brain to control body movement. It is located in the upper middle part of the brain.
- The sensory cortex: it is located in the frontal part of the parietal lobe and receives information from the spinal cord on the position of several parts of the body and how they move. This region can also be used to convey sense of touch information, including pain or pressure, which affects different portions of the body.
Temporal lobe
The temporal lobe controls visual, auditory memory and speech comprehension.
It includes areas that help control speech and listening skills, behavior and language.
He Wernicke area Is a portion of the temporal lobe that surrounds the auditory cortex and formulates and understands speech.
Occipital lobe
The occipital lobe is located at the back of the head and controls vision.
An injury in this area can lead to difficulties in reading.
Striated body
It is located on the walls of brain hemispheres And in it are the centers of correlation and coordination that regulate the rhythm of movements, facial expressions during communication.
Limbic system
Limbic system
Much of the hormonal responses that the body generates begin in this area.
It is related to memory , Attention, sexual instincts, emotions (eg pleasure, fear, aggressiveness), personality And behavior.
He limbic system It includes:
- Hypothalamus : It encompasses centers that regulate the internal balance and the homeostasis of the organism. It controls mood, temperature, hunger and thirst.
- Amygdala : Allows to give an answer to the emotions, fear or memories. It is a large portion of the Telencephalon .
- Hippocampus : Its main functions are learning and memory, specifically to convert short-term memory into long-term memory.
Thalamus
The thalamus is a relay center that controls the attention through which afferent stimuli pass to consciousness.
Trunk of the brain
All functions vital to life originate in the Trunk of the brain Including blood pressure, breathing, and heartbeat.
In humans, this area contains the marrow, midbrain And protuberance.
- midbrain : Conducts motor impulses from the cerebral cortex to the trunk-bridge and conducts sensory impulses from the spinal cord to the thalamus.
- Boss
- Bulb : Its functions include the transmission of impulses from the spinal cord to the brain. They also regulate cardiac, respiratory, gastrointestinal and vasoconstrictor functions.
Cerebellum
He cerebellum Is also known as the"small brain"and is considered the oldest part of the brain on the evolutionary scale.
The cerebellum controls essential bodily functions such as posture, coordination, or balance, allowing humans to move properly.
Principal functions
The main function of the brain is to keep the organism alive so that it interacts with the environment.
Everything that the human being thinks, feels and does has to do with specific functions of the brain.
These functions can be:
Sensitive (data reception)
Information is received from the stimuli and processed.
The stimuli of external or internal origin are captured through different receptors.
These receptors transform the stimuli received by energy signals.
Motor
The brain controls voluntary and involuntary movements.
The motor cortex is located in the frontal lobe, in front of the Fissure of Roland .
Integrators
They refer to mental activities such as attention, memory, learning or language.
Most patients who suffer some type of brain damage lose some behavior or cognitive ability.
Cognition
Nervous system and brain
Understanding the body-mind relationship is both a philosophical and a scientific challenge.
It is difficult to understand how mental activities such as emotions and thoughts can be implemented by real physical structures like Neurons or Synapses .
This is what led Rene Descartes and the majority of humanity later to believe in dualism: beliefs that the mind exists independently of the body.
However, there is substantial evidence against this argument.
Injuries of the brain can affect the mind in different ways, thus being interrelated brain and mind.
For example, the cortical stimulation that occurs in epilepsy also causes the appearance of complex sensations such as flashbacks, alucionations and other cognitive phenomena.
Therefore, most neuroscientists tend to be materialistic; They believe that the mind is reducible to a physical phenomenon.
Language
The main brain areas of speech are Broca area And the Wernicke area.
Metabolism
Magnetic Resonance Imaging of the Brain
The brain consumes 10 times more energy than it should by considering its size.
According to scientist Marcus Raichie of the University of Washington, 60-80% of energy consumed by the brain is dedicated to maintaining the connection between different neurons, while the rest of energy is dedicated to respond to the demands of the environment.
These articles may also interest you:
- Curiosities about the human brain .
- How much does an adult's brain weigh?
- How many neurons does the human brain have
References
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