external intercostal muscles

Information about external intercostal muscles

Intercostales externi muscle
Deep muscles of the chest and front of the arm, with the boundaries of the axilla. (Intercostalis externus labeled at bottom center.)
The Obliquus internus abdominis. (Intercostalis externus labeled at top center.)
Latinmusculi intercostales externi
subject #117 403
Origin:
Insertion:
Artery:intercostal arteries
Nerve:intercostal nerves
Action:Inhalation
Antagonist:intercostales interni muscles
Dorlands/Elsevier m_22/12549368
The Intercostales externi (External intercostals) are eleven in number on either side.

They extend from the tubercles of the ribs behind, to the cartilages of the ribs in front, where they end in thin membranes, the anterior intercostal membranes, which are continued forward to the sternum.

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 Intercostales interni, and their fibers are directed obliquely downward and lateralward on the back of the thorax, and downward, forward, and medialward on the front.

Variations

Continuation with the Obliquus externus 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


A central rib of the left side. Inferior aspect.

Diagram of the course and branches of a typical intercostal nerve.


External links

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
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Muscles of torso
BACKsplenius: (capitis - cervicis) - erector spinae (iliocostalis - longissimus - spinalis) - latissimus dorsi
transversospinales: (semispinalis dorsi - semispinalis cervicis - semispinalis capitis - multifidus - rotatores) - interspinales - intertransversarii
SUBOCCIPITALrectus capitis posterior (major, minor) - obliquus capitis (inferior, superior)
CHESTintercostales (external, internal, innermost) - subcostales - transversus thoracis - levatores costarum - serratus posterior (inferior, superior) - diaphragm
ABDOMENobliques (external, internal) - transversus abdominis - rectus abdominis - pyramidalis - cremaster - quadratus lumborum
PELVISlevator ani (iliococcygeus, pubococcygeus, puborectalis) - coccygeus
PERINEUMsphincter ani (externus, internus) - superficial perineal pouch (transversus perinei superficialis - bulbospongiosus - ischiocavernosus) - deep perineal pouch (transversus perinei profundus, sphincter urethrae membranaceae)
For the bowling style in cricket, see .


The underarm (or armpit, axilla, or oxter) is the area on the human body directly under the joint where the arm connects to the shoulder.
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Latin}}} 
Official status
Official language of: Vatican City
Used for official purposes, but not spoken in everyday speech
Regulated by: Opus Fundatum Latinitas
Roman Catholic Church
Language codes
ISO 639-1: la
ISO 639-2: lat
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bold refer to the diagram at right.)

In the skull (8):
  • 1-9. cranium
  • 7. mandible
''In the middle ears (6):
  • malleus
  • incus
  • stapes
In the throat (1):
  • hyoid
In the shoulder girdle (4):
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bold refer to the diagram at right.)

In the skull (8):
  • 1-9. cranium
  • 7. mandible
''In the middle ears (6):
  • malleus
  • incus
  • stapes
In the throat (1):
  • hyoid
In the shoulder girdle (4):
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Arteries are muscular blood vessels that carry blood away from the heart.[1] All arteries, with the exception of the pulmonary and umbilical arteries, carry oxygenated blood.

The circulatory system is extremely important for sustaining life.
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The intercostal arteries are a group of arteries which supply the area between the ribs ("costae"), called the intercostal space.
  • Highest intercostal artery - first and second intercostal spaces

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  • Accessory nerve
  • Accessory obturator nerve
  • Alderman's nerve
  • Anococcygeal nerve
  • Ansa cervicalis
  • Anterior interosseous nerve
  • Anterior superior alveolar nerve
  • Aortic plexus
  • Auerbach's plexus
  • Auriculotemporal nerve
  • Axillary nerve

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The intercostal nerves are the anterior divisions (rami anteriores; ventral divisions) of the thoracic spinal nerves from T1 to T11.

Each nerve is connected with the adjoining ganglion of the sympathetic trunk by a gray and a white ramus communicans.
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Kinesiology is the scientific study of the anatomy, physiology, and mechanics of body movement, especially in humans. [1] The word kinesiology is derived the Greek "kinesis" (motion) + the suffix -ology or -logy from the greek "logos" or "logia"(meaning a field of study).
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Inhalation (also known as inspiration) is the movement of air from the external environment, through the airways, into the alveoli during breathing.

Inhalation begins with the onset of contraction of the diaphragm, which results in expansion of the intrapleural space
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An antagonist is a kind of muscle that acts in opposition to the movement generated by the agonist and is responsible for returning a limb to its initial position.

Antagonistic pairs in houses

These antagonistic muscles are found in pairs called antagonistic pairs.
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The Intercostales interni (Internal intercostals) are eleven in number on either side. They commence anteriorly at the sternum, in the interspaces between the cartilages of the true ribs, and at the anterior extremities of the cartilages of the false ribs, and extend
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Elsevier, the world's largest publisher of medical and scientific literature, forms part of the Reed Elsevier group. Based in Amsterdam, the company has substantial operations in the UK, USA and elsewhere.
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RIB can mean:
  • Rigid-hulled inflatable boat
  • Romanian International Bank
  • Routing Information Base
This article is about the bones called ribs. For other meanings, see rib (disambiguation).

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sternum (from Greek στέρνον, sternon, "chest" and hebrew pronounced "Shamokin" also meaning chest) or breastbone is a long, flat bone located in the center of the thorax (chest).
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The Intercostales interni (Internal intercostals) are eleven in number on either side. They commence anteriorly at the sternum, in the interspaces between the cartilages of the true ribs, and at the anterior extremities of the cartilages of the false ribs, and extend
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thorax is a division of an animal's body that lies between the head and the abdomen.

In mammals, the thorax is the region of the body formed by the sternum, the thoracic vertebrae and the ribs. It extends from the neck to the diaphragm, not including the upper limbs.
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The external oblique muscle (of the abdomen) (also external abdominal oblique muscle) is the largest and the most superficial (outermost) of the three flat muscles of the lateral anterior abdomen.
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The serratus anterior is a muscle that originates on the surface of the upper eight ribs at the side of the chest and inserts along the entire anterior length of the medial border of the scapula.
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Loyola University Chicago is a private co-educational religious-affiliated university established in Chicago in 1870 as Saint Ignatius College. It was founded by the Roman Catholic religious order of the Society of Jesus and bears the name of the Jesuit patron, Saint Ignatius of
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GPnotebook is a British medical database for general practitioners (GPs).[1] It is an online encyclopaedia of medicine that provides an immediate reference resource for clinicians worldwide. The database consists of over 30,000 pages of information.
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eMedicine is an online clinical medical knowledge base that was founded in 1996 by Scott Plantz and Richard Lavely, two medical doctors. It was sold to WebMD in January 2006.
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Public domain comprises the body of knowledge and innovation (especially creative works such as writing, art, music, and inventions) in relation to which no person or other legal entity can establish or maintain proprietary interests within a particular legal jurisdiction.
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Henry Gray's Anatomy of the Human Body (or Gray's Anatomy as it has commonly been shortened) is an English-language human anatomy textbook widely regarded as a classic work on the subject.
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MUSCLE (multiple sequence comparison by log-expectation) is public domain, multiple sequence alignment software for protein and nucleotide sequences.
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Torso is an anatomical term for the central part of the many animal bodies (including that of the human) from which extend the neck and limbs. It is sometimes referred to as the trunk. The torso includes the thorax and abdomen.
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human back is the large posterior area of the human body, rising from the top of the buttocks to the back of the neck and the shoulders. It is the surface opposite to the chest, its height being defined by the vertebral column (commonly referred to as the spine or
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The splenius capitis arises from the lower half of the ligamentum nuchæ, from the spinousial process of the seventh cervical vertebra, and from the spinous processes of the upper three or four thoracic vertebræ.
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The splenius cervicis (splenius colli) arises by a narrow tendinous band from the spinous processes of the third to the sixth thoracic vertebrae; it is inserted, by tendinous fasciculi, into the posterior tubercles of the transverse processes of the upper two or three
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The Erector spinæ (or Sacrospinalis in older texts), a bundle of muscles and tendons, and its prolongations in the thoracic and cervical regions, lie in the groove on the side of the vertebral column.
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