Intercostal muscle

Intercostal muscle

Infobox Muscle
Name = Intercostal muscle
Latin =
GraySubject = 117
GrayPage = 403


Caption = Deep muscles of the chest and front of the arm, with the boundaries of the axilla.


Caption2 =
Origin = ribs 1-11
Insertion = ribs 2-12 | heh Blood = intercostal arteries
Nerve = intercostal nerves
Action =
Antagonist =
MeshName = Intercostal+Muscles
MeshNumber = A02.633.567.900.500
DorlandsPre =
DorlandsSuf =

Intercostal muscles are several groups of muscles that run between the ribs, and help form and move the chest wall.

There are three principal layers;
* the external intercostal muscles, which aid in quiet and forced inhalation. They originate on ribs 1-11 and have their insertion on ribs 2-12. The external intercostals are responsible for the elevation of the ribs, and expanding the transverse dimensions of the thoracic cavity.Located around the ribs
* the internal intercostal muscles, which aid in forced expiration (quiet expiration is a passive process). They originate on ribs 1-11 and have their insertions on ribs 2-12. The internal intercostals are responsible for the depression of the ribs decreasing the transverse dimensions of the thoracic cavity.
* the innermost intercostal muscle

Both the external and internal muscles are innervated by the intercostal nerves (the ventral rami of thoracic spinal nerves), and are provided by the intercostal arteries and intercostal veins. Their fibers run in opposite directions.

Other intercostal muscles

Besides the scaleni, which also move the chest wall and have a function in inhalation, other intercostal muscles are:
* Subcostal muscles
* Transversus thoracis muscle

External links

*
*
* [http://faculty.ucc.edu/biology-potter/Musculature/sld020.htm UCC]

sexy muscel


Wikimedia Foundation. 2010.

Игры ⚽ Поможем сделать НИР

Look at other dictionaries:

  • intercostal muscle — n any of the short muscles that extend between the ribs filling in most of the intervals between them and serving to move the ribs in respiration: a) any of 11 muscles on each side between the vertebrae and the junction of the ribs and their… …   Medical dictionary

  • intercostal muscle — noun muscles between the ribs; they contract during inspiration • Syn: ↑intercostal, ↑musculus intercostalis • Derivationally related forms: ↑intercostal (for: ↑intercostal) • Hypernyms: ↑ …   Useful english dictionary

  • intercostal muscle — UK [ˌɪntə(r)kɒst(ə)l ˈmʌs(ə)l] / US [ˌɪntərkɑst(ə)l ˈmʌs(ə)l] noun [countable] Word forms intercostal muscle : singular intercostal muscle plural intercostal muscles medical one of the muscles between your ribs …   English dictionary

  • Innermost intercostal muscle — Latin musculus intercostalis intimus Origin Upper border of a rib Insertion    Inferior border of the rib above Artery …   Wikipedia

  • external intercostal muscle — n INTERCOSTAL MUSCLE (a) called also external intercostal …   Medical dictionary

  • internal intercostal muscle — n INTERCOSTAL MUSCLE (b) called also internal intercostal …   Medical dictionary

  • Intercostal — means between the ribs . It can refer to: * Intercostal muscle * Highest intercostal vein * Intercostal arteries …   Wikipedia

  • intercostal Anatomy — [ˌɪntə kɒst(ə)l] adjective situated between the ribs. noun an intercostal muscle. Derivatives intercostally adverb …   English new terms dictionary

  • intercostal — [in΄tər käs′təl, in΄tərkôs′təl] adj. between the ribs n. an intercostal muscle, etc. intercostally adv …   English World dictionary

  • Intercostal nerves — Infobox Nerve Name = PAGENAME Latin = nervi intercostales GraySubject = 211 GrayPage = 945 Caption = Diagram of the course and branches of a typical intercostal nerve. Caption2 = Intercostal nerves, the superficial muscles having been removed.… …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”