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external intercostal muscles wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 structure 2 variations 3 additional images 4 see also 5 references toggle the table of contents external intercostal muscles 18 languages العربية català dansk deutsch فارسی suomi français hrvatski magyar italiano 日本語 한국어 nederlands polski português русский slovenščina 中文 edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikimedia commons wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia redirected from external intercostal muscle rib muscle this article includes a list of references related reading or external links but its sources remain unclear because it lacks inline citations please help improve this article by introducing more precise citations may 2015 learn how and when to remove this message external intercostal muscles position of the external intercostal muscles shown in red seen from the back details origin lower border of ribs insertion upper border of rib below artery intercostal arteries nerve intercostal nerves actions inhalation antagonist intercostales interni muscles identifiers latin musculi intercostales externi ta98 a04 4 01 012 ta2 2311 fma 74084 anatomical terms of muscle edit on wikidata the external intercostal muscles or external intercostals intercostales externi are eleven in number on both sides structure edit a cutout of the thoracic wall showing the three layers of intercostal muscle from the left wall the muscles extend from the tubercles of the ribs behind to the cartilages of the ribs in front where they end in thin membranes the external intercostal membranes which are continued forward to the sternum these muscles work in unison when inhalation occurs the internal intercostal muscles relax while the external muscles contract causing the expansion of the chest cavity and an influx of air into the lungs each arises from the lower border of a rib and is inserted into the upper border of the rib below in the two lower spaces they extend to the ends of the cartilages and in the upper two or three spaces they do not quite reach the ends of the ribs they are thicker than the internal intercostals and fibers are directed obliquely downward and laterally on the back of the thorax and downward forward and medially on the front variations edit continuation with the external oblique or serratus anterior a supracostalis muscle from the anterior end of the first rib down to the second third or fourth ribs occasionally occurs additional images edit this gallery of anatomic features needs cleanup to abide by the medical manual of style galleries containing indiscriminate images of the article subject are discouraged please improve or remove the gallery accordingly may 2015 position of the external intercostal muscles shown in red animation deep muscles of the chest and front of the arm with the boundaries of the axilla intercostalis externus labeled at bottom center a central rib of the left side inferior aspect diagram of the course and branches of a typical intercostal nerve see also edit inhalation references edit wikimedia commons has media related to external intercostal muscles this article incorporates text in the public domain from page 403 of the 20th edition of gray s anatomy 1918 v t e muscles of the thorax and back back splenius capitis cervicis erector spinae iliocostalis longissimus spinalis transversospinales semispinalis multifidus rotatores interspinales intertransversarii vertebral column trapezius latissimus dorsi rhomboid major minor levator scapulae fascia thoracolumbar fascia thorax intercostal muscles external internal innermost subcostalis transversus thoracis levatores costarum serratus posterior inferior superior thoracic diaphragm thoracic cavity pectoralis major pectoralis minor subclavius serratus anterior sternalis fascia pectoral fascia clavipectoral fascia portal anatomy authority control databases terminologia anatomica this muscle article is a stub you can help wikipedia by adding missing information v t e retrieved from https en wikipedia org w index php title external_intercostal_muscles oldid 1318027493 categories muscles of the torso muscle stubs hidden categories articles with short description short description is different from wikidata articles lacking in text citations from may 2015 all articles lacking in text citations articles with gallery cleanup tags commons category link is on wikidata wikipedia articles incorporating text from the 20th edition of gray s anatomy 1918 all stub articles this page was last edited on 21 october 2025 at 13 48 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search toggle the table of contents external intercostal muscles 18 languages add topic