Logan Steele
The brain is the command centre of the body, controlling everything we do, even when we're asleep. It is made up of many parts, each with its own function, and it works with the nervous system to send messages to the muscles. These messages are sent via neurons, which connect the brain to the muscles and tell them to contract and move. The brain stem, for example, controls involuntary muscles like those in the heart and stomach, while the cerebrum controls our voluntary muscles, which move when we want them to. The cerebellum, meanwhile, is responsible for balance, movement, and coordination. Together, the brain and nervous system form the neuromuscular system, which includes all the muscles in the body and the nerves that serve them.
| Characteristics | Values |
|---|---|
| Brain part responsible for muscle movement | The cerebrum, cerebellum, brain stem, medulla, motor cortex, basal ganglia, and neurons |
| Type of muscle movement | Voluntary and involuntary |
| Muscle movement mechanism | Messages from the brain travel through the spinal cord and nerves to activate muscles |
| Muscle memory | Procedural memory, the brain stores and accesses information to perform practiced physical actions |
| Muscle control | The brain controls muscle movement, including contraction and relaxation |
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What You'll Learn
The brain's role in muscle movement
The brain is the command centre of the body, controlling and coordinating all our movements. It achieves this through the nervous system, which transmits messages to the muscles through electrical impulses. This process is called neuromuscular interaction, and it involves two types of neurons: sensory neurons and motor neurons. Sensory neurons carry messages from the senses to the brain, while motor neurons carry messages from the brain to the muscles, activating them and causing them to contract and move.
The brain is divided into several parts, each with its own specific functions. The cerebrum, the largest part of the brain, is responsible for controlling voluntary muscles—those that move when we want them to. It is involved in a wide range of tasks, from dancing and kicking a soccer ball to solving math problems and drawing. The cerebrum also houses our memory and helps us with reasoning. Interestingly, the right half of the cerebrum controls the left side of the body, while the left half controls the right.
The cerebellum, located at the back of the brain, below the cerebrum, plays a crucial role in balance, movement, and coordination. It helps us stand upright, maintain our balance, and move with grace and fluidity. The cerebellum acts as a modulator, using sensory information to make slight adjustments to our movements, ensuring they are smooth and precise.
Another important player in the brain's control of muscle movement is the brain stem. Sitting beneath the cerebrum and in front of the cerebellum, the brain stem connects the brain to the spinal cord. It controls involuntary muscles, such as those in the heart and stomach, regulating essential functions like breathing, digestion, and blood circulation. The brain stem also acts as a secretary, sorting through the myriad messages exchanged between the brain and the body.
The process of muscle movement is complex and involves multiple pathways and interactions. Messages originate in the cortex, the outer layer of the brain, and travel through the pons, forming tracts that descend through the spine. These tracts include the corticospinal tract, which controls the muscles of the body, and the corticobulbar tract, which controls the muscles of the head and neck. Along these tracts, upper motor neurons transmit signals from the brain to lower motor neurons, which then interact directly with muscle fibres, causing them to contract and relax, resulting in movement.
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The cerebrum and its functions
The cerebrum is the largest part of the brain, located at the front and top of the skull. It is responsible for a wide range of functions, including muscle movement, language, sensory processing, and conscious thought. The cerebrum is divided into four lobes: the frontal, parietal, temporal, and occipital lobes, each of which controls specific functions.
The frontal lobe, the largest lobe of the brain, is involved in personality characteristics, decision-making, and movement. It contains the Broca's area, which is associated with speech ability. The parietal lobe, located in the middle of the brain, helps individuals identify objects and understand spatial relationships. It is also involved in interpreting pain and touch. The temporal lobe plays a crucial role in hearing, spatial and visual perception, memory, and emotion. It includes the Wernicke area, responsible for understanding spoken and written language.
The cerebrum also includes the thalamus, which acts as a relay station, directing sensory input from the thalamus to the relevant parts of the cerebrum. The hypothalamus, located beneath the thalamus, manages functions in the nervous and endocrine systems, controlling body temperature, heart rate, and blood pressure. The hippocampus, within the temporal lobe, assists in memory management and retrieval.
Additionally, the cerebrum is responsible for initiating and controlling muscle movement. Messages originate from the cortex, specifically the motor cortex, and are sent to the muscles, allowing for precise and coordinated movements. The cerebellum, a small part of the brain located below the cerebrum, plays a supporting role in movement by calculating and controlling the fine adjustments required for smooth and accurate actions.
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The cerebellum and its functions
The cerebellum, the largest part of the hindbrain, is located in the posterior cranial fossa, behind the fourth ventricle, the pons, and the medulla oblongata. It is composed of two hemispheres joined by the vermis and is sub-divided into three lobes – anterior, posterior, and flocculonodular. The cerebellum is a neuron-rich structure, containing 80% of the brain's neurons.
The cerebellum is a vital component of the human brain as it plays a role in motor movement regulation and balance control. It coordinates gait and maintains posture, controls muscle tone and voluntary muscle activity but cannot initiate muscle contraction. It has special sensors that detect shifts in balance and movement, sending signals for the body to adjust and move. The cerebellum times muscle actions so that the body can move smoothly.
The cerebellum is also involved in cognitive functions such as language processing, memory, and learning. It is thought to generate predictions of the future values or trajectories of sensorimotor variables. It also plays a role in regulating emotion and making decisions.
The cerebellum receives vascular supply from three main arteries that originate from the vertebrobasilar anterior system: the superior cerebellar artery (SCA), the anterior inferior cerebellar artery (AICA), and the posterior inferior cerebellar artery (PICA).
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The brain stem and its functions
The brain stem is the region of the brain located inferior to the thalamus, superior to the spinal cord, and anterior to the cerebellum. It is a stalk-like projection that extends caudally from the diencephalon into the cranial fossa, connecting distally with the spinal cord and posteriorly with the cerebellum. The brain stem is composed of both white and grey matter. Grey matter contains nerve cell bodies, while white matter contains the axons of nerves that connect different bodily structures.
The brainstem has three parts: the midbrain, pons, and medulla oblongata. Each part has a unique structure and function. The midbrain, or the superior segment of the brainstem, extends caudally from the base of the thalamus to the superior roof of the fourth ventricle. It is involved in reward pathways, pain suppression, and coordinating eye movements. The midbrain contains the crus cerebri, which includes motor fibres of the corticospinal, corticonuclear, and corticopontine tracts. It also contains the tegmentum, which includes the nuclei of the oculomotor nerve (CN III) and the trochlear nerve (CN IV), the red nucleus, the substantia nigra, and ascending pathways. The tectum, another part of the midbrain, contains two pairs of relay nuclei, the superior colliculi and the inferior colliculi, which are involved in visual and auditory pathways.
The pons is the middle portion of the brainstem, connecting the midbrain and the medulla oblongata. It contains neurons that produce the neurotransmitter norepinephrine, as well as motor nuclei that help control movements and breathing. The pons includes the fifth, sixth, seventh, and eighth cranial nerves, which are involved in controlling eye movements and facial expressions.
The medulla oblongata, or medulla, is the last and most distal section of the brainstem. It is continuous with the spinal cord and contains mostly motor fibres that assist with movements of various body parts, such as the tongue. The medulla carries motor fibres from the motor cortex of the cerebrum to the spinal cord, with the majority of these fibres crossing to the opposite side.
The brainstem plays a critical role in maintaining functions necessary for life, including breathing, consciousness, heart rate, blood pressure, and sleep regulation. It houses most cranial nerve nuclei and is a passageway for ascending and descending neural pathways. The reticular formation, a network of brainstem nuclei and neurons, is involved in vital functions such as consciousness, heart rate, respiratory rate, blood pressure regulation, movement coordination, and sleep. The brainstem also includes the substantia nigra, which is rich in dopamine neurons and plays a key role in modulating motor movement and reward functions.
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The nervous system and its functions
The nervous system is divided into the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS includes the brain and spinal cord, while the PNS consists of everything else, including the nerves of the face, arms, legs, and torso. The nervous system plays a role in almost every aspect of our health and well-being, controlling basic body functions such as the beating of the heart, breathing, digestion, sweating, and shivering. It also controls the senses: sight, hearing, taste, touch, and smell.
The brain is an organ of nervous tissue responsible for responses, sensation, movement, emotions, communication, thought processing, and memory. It has around 100 billion neurons, which carry messages to and from different parts of the body. Messages originate from the cortex, the outer layer of the brain, and travel to the muscles, but they make a stop first at the spinal cord, which carries motor and sensory signals between the brain and nerves. The spinal cord also contains separate circuits for many reflexes. The nervous system also includes the autonomic nervous system, which controls many of the body's automatic processes, such as breathing and sweating. The autonomic nervous system is further divided into the sympathetic nervous system, which controls how you respond in an emergency or when stressed, and the parasympathetic nervous system, which prepares the body for rest.
The brain controls movement through the spinal cord, which sends motor commands from the brain to the peripheral body and relays sensory information from the sensory organs back to the brain. The cortex, or outermost layer of the brain, is divided into two hemispheres, the left and right, which have different functions but work together seamlessly. Each hemisphere has four lobes: the frontal, parietal, temporal, and occipital lobes, which each carry out different functions. The primary motor cortex is involved in so-called "muscle memory", which is actually procedural memory, or "unconscious" information that the brain stores and accesses.
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Frequently asked questions
Muscles contract and move when they receive messages from the brain via nerves called motor neurons. These neurons carry messages to and from the brain through the spinal cord to muscles in the body.
The cerebrum is the largest part of the brain and controls voluntary muscles—the ones that move when you want them to. The cerebrum has two halves, with one on either side of the head. The right half controls the left side of the body, and the left half controls the right side.
The brain stem sits beneath the cerebrum and connects the brain to the spinal cord. It controls involuntary muscles—those that work automatically without conscious thought, such as the heart and stomach.
Muscle memory is a form of procedural memory, an "unconscious" type of information that the brain stores and accesses. It involves the primary motor cortex, basal ganglia, and cerebellum. Muscles that have previously been trained can more easily regain strength and volume after prolonged inactivity.
Damage to upper motor neurons can result in hyperactive reflexes and continuous muscle contraction, while damage to lower motor neurons can lead to hypo-active reflexes, loss of muscle tone, and even paralysis.
