explain 12 muscles of thorax?

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Expert Solution

Muscles of thorax :

Diaphram - It is the muscle of floor of the thorax, it is the main muscle of inspiration. Contration of diaphram creates negative intrathoracic pressure and hence sucks air inside the lungs.
Internal intercostal - these are located inbetween the ribs, 11 pairs on either side of the chest wall. They depress the ribs and hence help in forceful expiration
External intercostal - these are also located between ribs. They elevate the ribs and expand the chest. They are responsible for quite and forceful inspiration.
Innermost Intercostal - they are the deepest muscle of intercostal space. It is muscle of forceful expiration.
Sucalvius - Small triangular muscle between clavicle and 1st rib. It is present in the anterior chest wall.
Serratus anterior
Serratus Posterior superior - thin quadrilateral muscle in the posterior and Superior part of the thoracic wall.
Serratus Posterior Inferior - It is located in mid to lower part of Posterior wall of thorax. It is present in V shape manner
Pectoralis major - It is fan shaped muscle in the chest wall situated below the brest. It forms the main bulk of chest wall.
Pectoralis minor - It is thin triangular shaped muscle in the upper part of the chest wall, beneth the pectoralis major.
Levator scapulae - present in the posterior part of thorax. Elevates the scapula.
Rhomboidius - connect the scalula to thr vertebrae.

Sydney Mullin answered 10 months ago

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