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Body Atlas, Muscle Reference

Muscles

Complete muscle reference, origins, insertions, nerve supply, actions, clinical notes, and common injuries.

18 muscles

18 muscles in Chest Clear ×

Muscle Diaphragm diaphragma Chest The diaphragm is the primary muscle of breathing, a domed musculotendinous partition separating the thorax from… Muscle Intercostal Muscles (External) musculi intercostales externi Chest The external intercostal muscles occupy the posterior and lateral intercostal spaces, with fibres running inferomedially analogous… Muscle Intercostales Externi musculi intercostales externi Chest The external intercostal muscles fill the intercostal spaces from the vertebral column to the costochondral junctions… Muscle Intercostales Interni musculi intercostales interni Chest The internal intercostal muscles run opposite to the external intercostals, with fibres directed downward and backward… Muscle Internal Intercostals musculi intercostales interni Chest The internal intercostal muscles run perpendicular to the external intercostals (superoanteriorly rather than inferoanteriorly), depressing the… Muscle Pectoralis Major musculus pectoralis major Chest The pectoralis major is a large, fan-shaped muscle that spans the front of the upper chest,… Muscle Pectoralis Major (Clavicular Head) musculus pectoralis major pars clavicularis Chest The clavicular head of the pectoralis major is the upper portion of the fan-shaped pectoral muscle,… Muscle Pectoralis Major (Sternocostal Head) musculus pectoralis major pars sternocostalis Chest The sternocostal head is the larger and more powerful component of the pectoralis major, providing the… Muscle Pectoralis Minor musculus pectoralis minor Chest The pectoralis minor is a thin, triangular muscle that lies completely underneath the pectoralis major, connecting… Muscle Pectoralis Minor (Full) musculus pectoralis minor Chest Pectoralis minor is the key muscle producing anterior scapular tilt (inferior angle lifted away from the… Muscle Rhomboid Major (Full) musculus rhomboideus major Chest The rhomboid major is the larger of the two rhomboids, retracting the scapula and rotating the… Muscle Rhomboid Minor (Full) musculus rhomboideus minor Chest The rhomboid minor is the smaller, more superior rhomboid, inserting at the root of the scapular… Muscle Rotatores (Thoracic) musculi rotatores thoracis Chest The rotatores are the deepest of the transversospinalis group, spanning one or two vertebral levels in… Muscle Serratus Anterior musculus serratus anterior Chest The serratus anterior is a broad, saw-toothed muscle wrapping around the lateral chest wall and connecting… Muscle Serratus Anterior (Full) musculus serratus anterior Chest Serratus anterior is the key muscle holding the scapula against the thorax and rotating it upward… Muscle Subclavius musculus subclavius Chest The subclavius is a small muscle running parallel to the clavicle from the first costochondral junction… Muscle Subclavius (Full) musculus subclavius Chest The subclavius is a small muscle tucked between the first rib and the clavicle, depressing the… Muscle Transversus Thoracis musculus transversus thoracis Chest The transversus thoracis (sternocostalis) is a thin muscle on the inner surface of the anterior thoracic…