Intercostal muscle - Citizendia

Intercostal muscle

Deep muscles of the chest and front of the arm, with the boundaries of the axilla. The axilla (or armpit, underarm, or oxter) is the area on the human body directly under the joint where the Arm connects to the Shoulder
Gray's	subject #117 403
Origin	ribs 1-11
Insertion	ribs 2-12
Artery:	intercostal arteries
Nerve:	intercostal nerves
Action:
MeSH	Intercostal+Muscles

Intercostal muscles are several groups of muscles that run between the ribs, and help form and move the chest wall. A typical Adult Human skeleton commonly consists of 206 208 or more bones depending on the method used in counting A typical Adult Human skeleton commonly consists of 206 208 or more bones depending on the method used in counting Arteries are Blood vessels that carry blood away from the Heart. The intercostal arteries are a group of arteries which supply the area between the Ribs ("costae" called the Intercostal space. Accessory nerve Accessory obturator nerve Alderman's nerve Anococcygeal nerve Ansa The intercostal nerves are the anterior divisions (rami anteriores ventral divisions of the Thoracic spinal nerves from T1 to T11 Kinesiology, also known as Human Kinetics, is the science of human movement Medical Subject Headings ( MeSH) is a huge Controlled vocabulary (or metadata system for the purpose of indexing journal articles and books Muscle (from Latin musculus, diminutive of mus "mouse" is contractile tissue of the body and is derived from the In Vertebrate Anatomy, ribs ( Latin costae) are the long curved Bones which form the ribcage. The thoracic cavity (or chest cavity) is the chamber of the human body (and other animal bodies that is protected by the Thoracic wall ( Thoracic cage

There are three principal layers;

the external intercostal muscles, which aid in quiet and forced inhalation. The Intercostales externi ( External intercostals) are eleven in number on either side Inhalation (also known as respiration) is the movement of air from the external environment through the air ways and into the Alveoli. 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. The thoracic cavity (or chest cavity) is the chamber of the human body (and other animal bodies that is protected by the Thoracic wall ( Thoracic cage

Located around the the ribs

the internal intercostal muscles, which aid in forced expiration (quiet expiration is a passive process). The Intercostales interni ( Internal intercostals) are eleven in number on either side 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. The Innermost intercostal muscle is a layer of Intercostal muscle beneath the Intercostal nerves and Internal intercostal muscles. The intercostal nerves are the anterior divisions (rami anteriores ventral divisions of the Thoracic spinal nerves from T1 to T11 The ventral ramus ( anterior ramus, anterior branch, anterior divisions of the spinal nerves) supply the antero-lateral parts of the trunk and the limbs The thoracic nerves are the Spinal nerves emerging from the Thoracic vertebrae. The intercostal arteries are a group of arteries which supply the area between the Ribs ("costae" called the Intercostal space. The intercostal veins are a group of veins which drain the area between the Ribs ("costae" called the Intercostal space. 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

The scalene muscles are a group of three pairs of Muscles in the lateral Neck, namely the Scalenus anterior, Scalenus medius, and Scalenus The Subcostales (singular subcostalis (Infracostales consist of muscular and Aponeurotic Fasciculi, which are usually well-developed only in the lower part of the The tranversus thoracis lies internal to the Thoracic cage, anteriorly GPnotebook is a British medical database for General practitioners (GPs The State University of New York Health Science Center at Brooklyn, better known as SUNY Downstate Medical Center, is an academic medical center and is the only one of its kind

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