Maximus Gage
A muscle fold is a term that can refer to a few different things. One interpretation is the folding of the titin protein, which assists muscle contraction. Another is the FOLD and HOLD method, which is a technique for relieving muscle aches and pains. This method involves folding the body over a tender spot to relax the muscle, and then holding that position for at least 90 seconds. Additionally, muscle folds can refer to ventricular folds, which are located in the human larynx and are involved in vocal articulation. They are also known as vestibular or false vocal folds.
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What You'll Learn
Vestibular or false vocal folds
The vestibular folds, also known as the false vocal folds, are located above the true vocal folds. They are separated from the true vocal folds by the laryngeal ventricle.
Historically, the vestibular folds were thought to be unrelated to the production of a "normal" voice. However, they are involved in vocal articulation during glottal stops and pressed phonation. They are also active during Mongolian throat singing. The vestibular folds are involved in the closure of the laryngeal lumen during swallowing, coughing, gagging, and other primitive reflexes.
The vestibular folds secrete mucosa through their glands to lubricate the true vocal folds. They also provide antimicrobial defence protection. During phonation, the ventricular gap is kept large enough to prevent unwanted vibration of the vestibular folds. The microstructure of the ventricular fold contributes to its mechanical properties and behaviour during articulation and phonation.
The ventricular folds contain anteriorly coursing thyroarytenoid and ventricularis muscle fibres lying in the lower half of the VF posteriorly. Some ventricularis muscle is also evident in the upper and lateral portions of the fold more anteriorly. In an extensive morphological study of the VF musculature of 11 larynges of human foetuses and 6 adult human larynges, Motta found three groups of compact fascia in the superior-lateral portion of the false vocal folds. These muscular fibres originate from the anterior-lateral border of the arytenoid cartilage and terminate in the sub-mucosa of the ventricular fold.
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Muscle contraction and protein folding
Human muscles work by contracting and relaxing to cause movement. There are about 600 muscles in the human body, and they have a range of functions, from pumping blood to supporting movement. The brain, nerves, and skeletal muscles work together to cause movement, and this is collectively known as the neuromuscular system.
Skeletal muscles are under our conscious control and are also known as voluntary muscles. They are generally grouped into opposing pairs, such as the biceps and triceps. Smooth muscle, on the other hand, is located in various internal structures like the digestive tract, uterus, and blood vessels. Its motion occurs without our conscious awareness, and it is arranged in layered sheets that contract in waves along the length of the structure.
The ventricular folds, also known as vestibular or false vocal folds, are located above the true vocal folds. They are involved in vocal articulation during glottal stops and pressed phonation and are active during Mongolian throat singing. They also have a role in the closure of the laryngeal lumen during swallowing, coughing, and gagging.
Protein folding plays a crucial role in muscle contraction. Titin, the largest protein in the human body, determines the passive elasticity of muscles. The stepwise unfolding and folding of titin immunoglobulin (Ig) domains occur in the elastic I-band region of intact myofibrils. Experiments have shown that the unfolding and refolding of titin's Ig domains contribute significantly to muscle contraction.
During muscle contraction, a signal from the central nervous system via motor neurons initiates the process. At the neuromuscular junction, acetylcholine is released, generating an action potential. This leads to the release of calcium ions in the sarcoplasm, which then bind to troponin on actin filaments. Myosin binds to the exposed active site on actin, pulling the actin filament towards the centre, resulting in contraction.
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Muscle disorders
The ventricular folds, also known as the vestibular or false vocal folds, are located above the true vocal folds. They are involved in vocal articulation during glottal stops and pressed phonation, and they actively participate in Mongolian throat singing. Ventricular folds also play a role in swallowing and other reflexes such as coughing and gagging. They secrete mucosa to lubricate the true vocal folds and provide antimicrobial protection.
Muscular dystrophy (MD) is a group of genetic diseases that cause progressive weakness and degeneration of skeletal muscles. There are more than 30 types of MD, and they can affect various organs in addition to muscles, including the heart, lungs, gastrointestinal system, endocrine glands, spine, eyes, and brain. MD often leads to difficulties in walking and breathing, and it can cause bone thinning and scoliosis. Some individuals with MD experience cognitive and behavioural impairments.
Another muscle disorder is inflammatory myopathy, which can produce symptoms similar to MD but is caused by different genetic defects. Progressive muscle weakness and cardiomyopathy (heart muscle weakness) are also disorders that can mimic MD. These disorders can interfere with the heart's pumping ability and cause similar issues to MD.
The FOLD and HOLD method is a simple, drug-free solution for relieving muscle aches and pains caused by muscle spasms. It involves identifying the spastic muscle by locating a tender spot, which feels like a firm, painful knot. The affected muscle is then relaxed by folding the body over the tender spot and holding this position for at least 90 seconds, allowing the muscle to rejuvenate. Returning to the normal position should be done slowly to avoid re-provoking the muscle spasm.
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Musculoskeletal system
The musculoskeletal system refers to the combination of skeletal muscles and bones in the human body. There are around 600 muscles in the human body, which work in tandem with nerves and the brain to enable movement. This collective system is known as the neuromuscular system.
Skeletal muscles are attached to bones and allow for movement. They are also known as voluntary muscles, as they are under our conscious control. Skeletal muscles are generally grouped into opposing pairs, such as the biceps and triceps in the upper arm. The tissue of skeletal muscles appears striped under a microscope, so they are also referred to as striated muscles.
Smooth muscle, on the other hand, is located in internal structures like the digestive tract, uterus, and arteries. Smooth muscle is involuntary, meaning its motion occurs without our conscious awareness. Cardiac muscle is another type of involuntary muscle, specific to the heart.
The ventricular folds, or vestibular folds, are located above the true vocal folds. They are commonly referred to as 'false' vocal folds, as they were not thought to be directly involved in normal voice production. However, recent studies have shown that they are indeed involved in vocal articulation during glottal stops and pressed phonation. They also play a role in swallowing and other reflexes, such as coughing and gagging. The biomechanical modelling of ventricular folds is an area of ongoing research, with scientists seeking to better understand the role of these muscles during phonatory and non-phonatory tasks.
Muscle disorders, collectively known as myopathy, can cause weakness, pain, or even paralysis. A simple method to relieve muscle aches and pains is the FOLD and HOLD method, which helps to alleviate pain caused by muscle spasms. This method involves identifying a tender spot, or spastic muscle, and then folding the body over that spot to relax the muscle. Holding this position for at least 90 seconds allows the muscle to rejuvenate, and it is important to return to the normal position slowly to avoid re-provoking the muscle.
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Vocal fold movement
Vocal folds, also known as vocal cords, are a pair of pliable shelves of soft tissue that stretch across the top of the trachea (windpipe). They are enclosed within the thyroid cartilage, which forms the Adam's apple. The vocal folds, together with the muscles and cartilages that support them, make up the larynx. The larynx evolved as a valve to protect the airway and lungs and is positioned where the airway and oesophagus separate.
Voice is produced by the vibration of the vocal folds. The lungs blow air against the vocal folds, which are in a nearly closed position. As the air pushes through the small space between the vocal folds, it makes the covering of the vocal folds, known as the mucosa, vibrate. This occurs through the venturi effect, where the passing air column creates a trailing Bernoulli effect, controlling the close phase. The Bernoulli effect is caused by the low pressure created behind the fast-moving air column. This suction draws in the pliable mucosa from each vocal fold, which meet in the midline before being pushed aside by more air from the lungs. The vocal folds vibrate in excess of 100 times per second during voicing and sometimes much faster. The volume of sound is a result of the pressure of the air that is blown past the vocal folds.
The frequency of the mucosal wave, or the opening and closing of the vocal folds, determines the pitch of the voice. The vocal folds can also lengthen and shorten, which helps to increase vocal fold tension and, thus, adjust the pitch.
Paradoxical vocal fold movement, or PVFM, is a condition where the vocal folds close when they should be open, making it hard to breathe or talk. It can cause serious problems when it occurs, and those affected may need to go to the hospital. Speech-language pathologists can help teach exercises that aid in keeping the vocal folds open during breathing.
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Frequently asked questions
A muscle fold is a term that can refer to a few different things. Firstly, it can refer to the folding of the titin protein during muscle contraction, which contributes to the force generated by a contracting muscle. Secondly, it can refer to the ventricular folds or vestibular folds in the larynx, which are involved in vocal articulation and phonation. Finally, it can also refer to skin folds, which are areas of skin that are naturally folded due to the underlying muscle fibers and connective tissues.
The FOLD and HOLD method is a technique used to relieve muscle aches and pains caused by muscle spasms. It involves identifying the spastic muscle by finding a tender spot, and then folding the body over that spot to shorten and relax the muscle. This folded position is held for a minimum of 90 seconds, allowing the muscle to rejuvenate. Returning to the normal position slowly is critical to avoid re-provoking the offending muscle.
Muscle pain can be caused by various factors such as poor conditioning, stress, weak muscles, a sedentary lifestyle, repetitive or sudden movements, and muscle spasms. Muscle disorders can also lead to pain, weakness, or even paralysis.
Examples of muscle folds in the human body include the ventricular folds in the larynx, the vocal folds or vocal cords, and skin folds such as the ileocecal fold beneath the terminal ileum of the cecum.
