Logan Steele
The human brain is a complex organ that regulates and controls everything we do, from our senses, emotions, thoughts, memories, movements, and behaviours. It is one of the two main parts of the central nervous system and weighs about 3 pounds in the average adult. The brain is divided into two halves or hemispheres, with the right hemisphere controlling the left side of the body and the left hemisphere controlling the right side of the body. These two halves communicate with each other through the corpus callosum, allowing us to perform various tasks and react to external stimuli.
| Characteristics | Values |
|---|---|
| Brain weight | 3 pounds |
| Brain composition | 60% fat, 40% water, protein, carbohydrates and salts |
| Brain parts | Brainstem, cerebrum, cerebellum, cortex, hypothalamus, thalamus, pituitary gland, meninges |
| Brain functions | Controls thought, memory, emotion, touch, motor skills, vision, respiration, heart rate, body temperature, hunger, balance, hearing, taste, speech, movement, behaviour, digestion, sleep and wake cycles, swallowing |
| Brain and nervous system | Brain is part of the central nervous system, which also includes the spinal cord; the peripheral nervous system includes the nerves that go through the body |
| Brain and muscles | The brain controls muscles through electrical impulses sent between the brain, organs, and muscles; the left side of the brain controls the right side of the body, and vice versa |
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What You'll Learn
The right side of the brain controls the left side of the body
The brain is an essential organ that controls thought, memory, emotion, touch, motor skills, vision, respiration, and every process that regulates the body. The brain and spinal cord make up the central nervous system, which relays messages back and forth to different parts of the body. The cerebrum, which forms the major portion of the brain, is divided into two major parts: the right and left cerebral hemispheres.
The left hemisphere and perhaps other portions of the brain are important in language. For instance, Broca's area in the frontal lobe of the left hemisphere is next to the region that controls the movement of facial muscles, the tongue, jaw, and throat. In about one-third of left-handed individuals, speech function may be located on the right side of the brain.
The cerebellum, located at the back of the brain, fine-tunes motor activity or movement. It helps maintain posture and a sense of balance by controlling the tone of muscles and the position of limbs. The cerebellum is important for performing rapid and repetitive actions, such as playing a video game.
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The left side of the brain controls the right side of the body
The brain is a complex organ that controls thought, memory, emotion, touch, motor skills, vision, respiration, and every process that regulates the body. The brain and spinal cord make up the central nervous system, which in turn controls the peripheral nervous system—the nerves that go through the entire body. The brainstem, in the lower part of the brain, connects the brain to the spinal cord.
The brain is divided into two cerebral hemispheres—the right and left. The right side of the brain controls the left side of the body and vice versa. This phenomenon is known as contralateral control. For example, if a person's right side of the brain is stimulated, the left side of the body will be affected. This is because the messages for movement and sensation cross over to the other side of the brain, causing the opposite limb to move or feel a sensation.
This can be observed in stroke patients who have problems with movement on one side of their body due to damage in the corresponding area of the brain. For instance, a person with damage to the leg area of the motor cortex on the right side of their brain may have difficulty moving their left leg. Similarly, if a brain tumour occurs on the right side of the brain that controls the movement of the arm, the left arm may become weak or paralysed.
The cerebellum, located at the back of the brain, also plays a role in motor control. It fine-tunes movements, helps maintain posture and sense of balance, and controls the tone of muscles and the position of limbs. It is particularly important for rapid and repetitive actions, such as playing a video game.
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The cerebellum fine-tunes motor activity
The brain is a complex organ that controls thought, memory, emotion, touch, motor skills, vision, breathing, temperature, hunger, and every process that regulates our body. The brain and spinal cord make up the central nervous system, which relays messages back and forth to different parts of the body. The cerebellum is a region of the brain that plays an important role in motor control and motor learning. It does not initiate movement, but it contributes to coordination, precision, and accurate timing. The cerebellum receives input from the spinal cord and other parts of the brain, including the cerebral cortex, and integrates these inputs to fine-tune motor activity. This process is believed to occur through a trial-and-error learning mechanism.
The cerebellum contains body maps that help to give us an embodied sense of self. It is in constant communication with the body and cortex through feedforward, feedback, and efferent copy pathways, allowing it to fine-tune and sequence our action commands. This results in smooth and graceful movements. The cerebellum is also involved in certain cognitive functions, such as language, attention, and regulating fear and pleasure responses. However, its movement-related functions are the most solidly established.
The precise timing of muscle contractions and the force necessary for each contraction depend on various factors, including the load placed on the muscle and its inherent properties. The cerebellum appears necessary for coordinating the activity of muscle groups, adjusting to changes in sensorimotor relationships. For example, when reaching for an object, the extensor muscle must be activated to start the movement, while the flexor muscle needs to be activated at the end to stop the movement appropriately.
Damage to the cerebellum does not cause paralysis but can lead to disorders in fine movement, equilibrium, posture, and motor learning. Individuals with cerebellar dysfunction continue to generate motor activity, but it becomes erratic and loses precision, resulting in uncoordinated and incorrectly timed movements. Thus, the cerebellum plays a crucial role in fine-tuning motor activity, ensuring smooth and coordinated movements.
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The brainstem connects the brain to the spinal cord
The brain is a complex organ that regulates everything we do, from our thoughts, memories, and emotions to our movement, heart rate, and breathing. It is made up of several different parts that work closely together to make us who we are. The brainstem is a small but important structure that connects the brain to the spinal cord.
The brainstem is located near the bottom of the brain, at the back of the skull. It is made up of three parts: the midbrain, the pons, and the medulla oblongata. These parts work together to control and coordinate the messages going in and out of the brain. The brainstem sends messages back and forth between the brain and other parts of the body, regulating many involuntary actions, such as heart rate, blood pressure, eye movements, facial movements and sensations. It also controls vital body functions that we often don't think about, such as breathing, swallowing, and digestion.
The midbrain, the top part of the brainstem, is involved in motor control, particularly eye movements, and the processing of vision and hearing. The pons, the middle portion of the brainstem, coordinates face and eye movements, facial sensations, hearing, and balance. It also relays messages from the cerebrum to the cerebellum and spinal cord, helping to control movement in the face. The medulla oblongata, the bottom part of the brainstem, regulates breathing, heartbeat, blood pressure, and swallowing.
The brainstem is an essential component of the central nervous system, which includes the brain and spinal cord. The spinal cord is a thick column of nerves surrounded by vertebrae that extend from the brainstem down the back. It sends information between the brain and most of the body through spinal nerves, which control body functions like movement, bladder and bowel control, and breathing. Together, the brainstem, the brain, and the spinal cord work in harmony to regulate and control our bodies and their responses to the surrounding world.
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The brain's cortex processes sensory information
The brain is a complex organ that controls thought, memory, emotion, touch, motor skills, vision, breathing, temperature, hunger, and every process that regulates our body. The brain and spinal cord make up the central nervous system (CNS), which in turn is made up of the autonomic nervous system and the peripheral nervous system. The autonomic nervous system controls basic body functions such as breathing, digestion, and shivering, while the peripheral nervous system is made up of the nerves that go through the whole body.
The brain's cerebral cortex, also known as the "gray matter", is the outermost layer of the cerebrum. The cerebral cortex is responsible for processing sensory information and directing it to other parts of the nervous system for further processing. For example, when you touch a hot stove, the nerves in your skin shoot a message of pain to your brain, and the brain then sends a message back telling the muscles in your hand to pull away.
The thalamus, located in the center of the brain, acts as a relay station for all incoming sensory and motor information. It receives and processes sensory information from the body and then sends it to the related area within the cerebral cortex for interpretation. Each type of sensory function has a thalamic nucleus that receives, processes, and transmits information to its related area within the cerebral cortex. For example, information coming through the eye travels to the retina, then to the optic nerve, and finally to the lateral geniculate nucleus of the thalamus, which processes the information and sends it to the primary visual cortex for interpretation.
The cerebral cortex can be divided into three main types of functions: sensory, motor, and association areas. Sensory areas receive sensory information from the senses and the environment. The occipital lobe, for instance, is responsible for visual processing and interpretation, while the parietal lobe processes sensory information such as touch, temperature, and pain. The motor cortex in the frontal lobe sends messages that direct the muscles in the arm and hand. The somatosensory cortex of the parietal lobe assesses the information delivered through touch, including the judgment of temperature.
Damage to any area of the cerebral cortex can result in symptoms such as memory issues, personality changes, attention problems, and weakness or loss of muscle control on one side of the body.
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Frequently asked questions
The right side of the brain controls the muscles on the left side of the body.
The left side of the brain controls the muscles on the right side of the body.
The cerebellum is responsible for fine-tuning motor activity and maintaining posture, sense of balance, and equilibrium. It controls the tone of muscles and the position of limbs.
There are 12 pairs of cranial nerves that emerge from the brainstem and control functions such as hearing, eye movement, facial sensations, taste, swallowing, and movement of the face, neck, shoulder, tongue, and other muscles.
The left hemisphere of the brain is generally responsible for language, speech, comprehension, arithmetic, and writing. It is also dominant in hand use and language in about 92% of people.
