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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.
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relax while the external muscles contract causing the expansion of the chest cavity and an influx of air into the lungs.
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muscle, from the anterior end of the first rib down to the second, third or fourth ribs occasionally occurs.
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A cutout of the thoracic wall showing the three layers of intercostal muscle - from the left wall.
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behind, to the cartilages of the ribs in front, where they end in thin membranes, the
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Knowledge articles incorporating text from the 20th edition of Gray's
Anatomy (1918)
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Galleries containing indiscriminate images of the article subject are discouraged
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They are thicker than the internal intercostals, and their fibers are directed
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Position of the external intercostal muscles (shown in red) seen from the back.
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Deep muscles of the chest and front of the arm, with the boundaries of the
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Position of the external intercostal muscles (shown in red). Animation.
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Diagram of the course and branches of a typical intercostal nerve.
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This gallery of anatomic features needs cleanup to abide by the
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417:. (Intercostalis externus labeled at bottom center.)
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57:but its sources remain unclear because it lacks
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325:downward and laterally on the back of the
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278:) are eleven in number on both sides.
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306:. These muscles work in unison when
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300:external intercostal membranes
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207:musculi intercostales externi
190:Intercostales interni muscles
884:. You can help Knowledge by
312:internal intercostal muscles
268:external intercostal muscles
103:External intercostal muscles
477:of the 20th edition of
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250:Anatomical terms of muscle
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143:Upper border of rib below
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43:This article includes a
372:medical manual of style
72:more precise citations.
337:Continuation with the
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276:intercostales externi
272:external intercostals
18:External intercostals
936:Muscles of the torso
824:clavipectoral fascia
738:transversus thoracis
685:thoracolumbar fascia
154:Intercostal arteries
747:serratus posterior
711:Intercostal muscles
763:thoracic diaphragm
743:levatores costarum
622:intertransversarii
594:Transversospinales
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166:Intercostal nerves
45:list of references
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796:serratus anterior
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64:Please help
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733:subcostalis
579:longissimus
196:Identifiers
70:introducing
925:Categories
791:subclavius
607:multifidus
459:References
453:Inhalation
382:(May 2015)
333:Variations
308:inhalation
185:Antagonist
178:Inhalation
27:Rib muscle
801:sternalis
726:innermost
640:trapezius
612:rotatores
323:obliquely
282:Structure
139:Insertion
756:superior
751:inferior
721:internal
716:external
650:rhomboid
584:spinalis
556:cervicis
543:splenius
475:page 403
447:See also
78:May 2015
855:Anatomy
551:capitis
520:of the
518:Muscles
304:sternum
173:Actions
120:Details
66:improve
878:muscle
841:Portal
811:Fascia
699:Thorax
677:Fascia
522:thorax
483:(1918)
415:axilla
327:thorax
149:Artery
126:Origin
876:This
660:minor
655:major
473:from
254:[
243:74084
202:Latin
161:Nerve
51:, or
882:stub
534:Back
526:back
524:and
345:: A
296:ribs
266:The
231:2311
214:TA98
132:ribs
341:or
270:or
238:FMA
226:TA2
927::
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