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Body Atlas, Muscle Reference

Muscles

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

62 muscles

62 muscles in Chest Clear ×

Muscle Bronchial Smooth Muscle musculus bronchialis Chest Bronchial smooth muscle encircles the airways from the main bronchi to the terminal bronchioles, forming the… Muscle Cardiac Conduction Muscle myocytus conducens cardiacus (fibra Purkinje) Chest Cardiac conduction cells are specialised modified cardiomyocytes with reduced contractile capacity and enhanced electrical automaticity and… Muscle Diaphragm diaphragma Chest The diaphragm is the primary muscle of breathing, a domed musculotendinous partition separating the thorax from… Muscle Esophageal Musculature tunica muscularis oesophagi Chest The esophageal musculature is unique in its transition from voluntary striated muscle in the upper esophagus… Muscle External Intercostals Detail musculi intercostales externi detail Chest The external intercostals are the inspiratory intercostal muscles, running obliquely forward and downward. Their oblique direction… Muscle Iliocostalis Thoracis musculus iliocostalis thoracis Chest The thoracic iliocostalis runs rib-to-rib in the thoracic region, extending and stabilising the thoracic spine while… Muscle Iliocostalis Thoracis Detail musculus iliocostalis thoracis detail Chest Iliocostalis thoracis is the thoracic segment of the lateral erector spinae column, bridging the lower six… Muscle Innermost Intercostal Muscles musculi intercostales intimi Chest The innermost intercostal muscles are the deepest layer of the intercostal musculature, lying deep to the… Muscle Innermost Intercostals Detail musculi intercostales intimi detail Chest The innermost intercostals are the deepest intercostal layer, separated from the internal intercostals by the intercostal… 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 Internal Intercostals Detail musculi intercostales interni detail Chest The internal intercostals run at right angles to the external intercostals. Their oblique direction depresses the… Muscle Interspinales Thoracis musculi interspinales thoracis Chest The thoracic interspinales are poorly developed and often absent, reflecting the rib cage stability at this… Muscle Interspinalis Thoracis musculus interspinalis thoracis Chest The interspinalis thoracis muscles are small, paired muscle slips connecting adjacent thoracic spinous processes. They are… Muscle Latissimus Dorsi musculus latissimus dorsi Chest The latissimus dorsi is the broadest muscle in the human body, spanning from the lower back… Muscle Latissimus Dorsi Detail musculus latissimus dorsi detail Chest The latissimus dorsi is the broadest muscle, covering most of the posterior thorax. Its thoracodorsal nerve… Muscle Levatores Costarum (Detail) musculi levatores costarum (aspectus detailiatus) Chest The levatores costarum are 12 pairs of small fan-shaped muscles in the posterior thorax, each arising… Muscle Levatores Costarum Breves musculi levatores costarum breves Chest The levatores costarum breves are 12 muscles, one per thoracic level, each elevating the immediately adjacent… Muscle Levatores Costarum Longi musculi levatores costarum longi Chest The levatores costarum longi are present at T7-T11 only, spanning two rib levels. They supplement the… Muscle Longissimus Thoracis musculus longissimus thoracis Chest The longissimus thoracis is the largest component of the erector spinae and the primary extensor of… Muscle Lower Trapezius musculus trapezius — pars inferior Chest The lower trapezius is the inferior portion of the trapezius muscle, characterised by its oblique upward… Muscle Multifidus Thoracis musculus multifidus thoracis Chest The thoracic multifidus provides segmental control of thoracic spinal motion, spanning 2-4 vertebral levels. It is…