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The diaphragm is the major muscle responsible for inhalation. It is a thin, dome-shaped muscle that separates the abdominal cavity from the thoracic cavity. During inhalation, the diaphragm contracts, so that its centre moves downwards and its edges move upwards, compressing the abdominal cavity and raising the ribs. This results in an expansion of the thoracic cavity, which draws air into the lungs. The external intercostal muscles are also important in inhalation, as they assist in elevating the rib cage. Accessory muscles that aid in inhalation include the sternocleidomastoid, scalenus anterior, medius, and posterior, pectoralis major and minor, serratus anterior, and latissimus dorsi.
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What You'll Learn
- The diaphragm contracts and flattens, pulling the lower surfaces of the lungs downwards
- The intercostal muscles and neck muscles help move the rib cage
- The scalene muscles are involved in breathing
- The abdominal muscles are sometimes involved in breathing out
- The serratus anterior, pectoralis major and minor, and trapezius muscles also contribute to respiration
The diaphragm contracts and flattens, pulling the lower surfaces of the lungs downwards
The diaphragm is a crucial muscle for inhalation, also known as inspiration. During inhalation, the diaphragm contracts and flattens, with its centre moving downwards and its edges moving upwards. This downward movement of the diaphragm compresses the abdominal cavity, pushing down on the lower surfaces of the lungs and causing them to expand. This expansion draws air into the lungs.
The diaphragm is a large, dome-shaped muscle located at the base of the lungs, separating the abdominal cavity from the thoracic cavity. When the diaphragm contracts, it increases the length and diameter of the chest cavity, expanding the lungs and facilitating inhalation.
In addition to the diaphragm, other muscles also play a role in inhalation. These include the intercostal muscles, which are one of the most important groups of respiratory muscles. During inhalation, the intercostal muscles help pull the ribs upward and outward, further increasing the volume of the thoracic cavity.
The scalene muscles, consisting of the scalenus anterior, scalenus medius, and scalenus posterior, are also involved in inhalation. They assist in elevating the rib cage, which contributes to the expansion of the thoracic cavity.
The contraction and flattening of the diaphragm, along with the assistance of these other muscles, work together to ensure effective inhalation and the intake of air into the lungs. This process is essential for maintaining respiration and adequate oxygen supply to the body.
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The intercostal muscles and neck muscles help move the rib cage
The diaphragm is a large, dome-shaped muscle located at the base of the lungs, above the abdominal cavity, and is the most important muscle for inhalation. During inhalation, the diaphragm contracts and moves downward, compressing the abdominal cavity and raising the ribs outward and upward, subsequently lifting and expanding the thoracic cavity. This expansion draws air into the lungs.
The scalene muscles also play a role in inspiration. They consist of scalenus anterior, scalenus medius, and scalenus posterior, and are involved in breathing. The contraction of these fibres raises each rib toward the rib above, with the overall effect of raising the rib cage, assisting in inhalation.
Other muscles that contribute to respiration include the serratus anterior, pectoralis major and pectoralis minor, trapezius, latissimus dorsi, erector spinae, iliocostalis, quadratus lumborum, serratus posterior superior, serratus posterior inferior, levatores costarum, transversus thoracis, and subclavius.
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The scalene muscles are involved in breathing
Scalenus anterior muscles extend from the anterior tubercles of the transverse processes of C3 to C6 vertebrae to the first rib, contributing to its elevation. Scalenus medius runs from the transverse processes of the axis and the transverse process of C3 to C7 until the first rib, also raising it. It is the most significant for breathing in this group. The scalenus posterior passes from the posterior tubercles of the transverse process of C4-6 to the second rib, helping to elevate the second rib.
The scalene muscles are active during the inspiratory phase of the breathing cycle, even when the increase in lung volume is small. They contract and relax, altering the volume of the thoracic cavity and the lungs, producing inspiration and expiration. During inspiration, the scalene muscles help to elevate the sternum and clavicle, subsequently lifting the ribs.
The diaphragm and external intercostals are the primary inspiratory muscles, with the diaphragm contracting during inhalation to expand the thoracic cavity and draw air into the lungs. However, the scalene muscles are important accessory muscles that support the breathing process, especially during deeper or more forceful breathing.
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The abdominal muscles are sometimes involved in breathing out
The muscles of respiration, also known as the 'breathing pump muscles', are a complex arrangement of muscles that contribute to inhalation and exhalation by aiding in the expansion and contraction of the thoracic cavity. The diaphragm and, to a lesser extent, the intercostal muscles drive respiration during quiet breathing. The diaphragm is a thin, dome-shaped muscle that separates the abdominal cavity from the thoracic cavity.
During inhalation, the diaphragm contracts, compressing the abdominal cavity and raising the ribs outward and upward, thereby expanding the thoracic cavity and drawing air into the lungs. The diaphragm is also involved in non-respiratory functions, such as preventing acid reflux and expelling vomit, faeces, and urine from the body.
The abdominal muscles contract, increasing abdominal pressure, and pushing a relaxed diaphragm against the lungs, which facilitates the expulsion of air. This active participation of the abdominal muscles in breathing out is particularly evident during periods of intense physical activity. It is important to note that the nerves connecting the breathing muscles to the brain must be intact for these muscles to contract and function effectively.
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The serratus anterior, pectoralis major and minor, and trapezius muscles also contribute to respiration
The muscles of respiration are those that contribute to inhalation and exhalation by aiding the expansion and contraction of the thoracic cavity. The diaphragm is the primary muscle involved in inhalation, with the intercostal muscles also playing a significant role.
However, several other muscles, including the serratus anterior, pectoralis major and minor, and trapezius, also contribute to respiration as accessory muscles. These muscles assist in the elevation of the rib cage, which is necessary for pulmonary ventilation.
The serratus anterior is a fan-shaped muscle that originates from the first to eighth or ninth ribs and inserts along the anterior surface of the scapula. It acts to pull the scapula forward and around the thorax, and it is a key stabiliser of the scapula, keeping the shoulder blades against the rib cage during rest and movement. This muscle is also referred to as the "big swing muscle" or "boxer's muscle" because it is responsible for the protraction of the scapula, which occurs when someone throws a punch.
The pectoralis major and minor muscles are located near the serratus anterior, with the pectoralis minor also known as the axioscapular group. These muscles work together with the serratus anterior to support the scapula and control its movements.
The trapezius muscle is involved in overhead lifting and acts in coordination with the serratus anterior to sustain the upward rotation of the scapula. This muscle evolved separately from the other axioscapular group muscles, which include the serratus anterior, rhomboid major, rhomboid minor, and levator scapulae.
These accessory muscles are important for respiration, particularly during periods of increased respiratory effort, such as during exercise or in cases of respiratory distress.
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Frequently asked questions
The diaphragm is the major muscle responsible for inhalation. It is a thin, dome-shaped muscle that separates the abdominal cavity from the thoracic cavity. During inhalation, the diaphragm contracts, so its centre moves downwards and its edges move upwards, expanding the thoracic cavity and drawing air into the lungs.
The intercostal muscles, located between the ribs, assist in inhalation by elevating the rib cage. The sternocleidomastoid and scalene muscles are also accessory muscles that aid in inhalation.
Accessory muscles are muscles that assist in breathing but do not play a primary role. Their involvement depends on the degree of respiratory effort.
The scalene muscles consist of the scalenus anterior, scalenus medius, and scalenus posterior. They are involved in breathing by contributing to the elevation of the ribs.
