Infraspinatus muscle

Infraspinatus muscle

Muscle infobox
Name = PAGENAME
Latin = musculus infraspinatus
GraySubject = 123
GrayPage = 441


Caption = Muscles on the dorsum of the scapula, and the Triceps brachii muscle: #3 is Latissimus dorsi muscle
#5 is Teres major muscle
#6 is Teres minor muscle
#7 is Supraspinatus muscle
#8 is Infraspinatus muscle
#13 is long head of Triceps brachii muscle


Caption2 = Muscles connecting the upper extremity to the vertebral column.
Origin = infraspinous fossa of the scapula
Insertion = middle facet of greater tubercle of the humerus
Blood = suprascapular and circumflex scapular arteries
Nerve = suprascapular nerve
Action = Lateral rotation of arm & Abduction of arm and stabilizes humerus
MeshName =
MeshNumber =
DorlandsPre = m_22
DorlandsSuf = 12549360
The Infraspinatus muscle is a thick triangular muscle, which occupies the chief part of the infraspinatous fossa.

Origin and insertion

It attaches medially to the infraspinous fossa of the scapula and laterally to the greater tubercle of the humerus.

It arises by fleshy fibers from its medial two-thirds, and by tendinous fibers from the ridges on its surface; it also arises from the infraspinatous fascia which covers it, and separates it from the Teres major and minor.

The fibers converge to a tendon, which glides over the lateral border of the spine of the scapula, and, passing across the posterior part of the capsule of the shoulder-joint, is inserted into the middle impression on the greater tubercle of the humerus.

Relations

The tendon of this muscle is sometimes separated from the capsule of the shoulder-joint by a bursa, which may communicate with the joint cavity.

Action

It is a lateral rotator of the glenohumeral joint and adductor of the arm.

The Infraspinatus and Teres minor rotate the head of the humerus outward (external rotation); they also assist in carrying the arm backward. Studies by Lastayo, w., etc. have shown the infraspinatus to be the major external rotator of the shoulder in comparison with the teres minor.Fact|date=October 2007

ee also

* Rotator cuff

External links

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Look at other dictionaries:

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  • Teres major muscle — Muscle infobox Name = Teres major muscle Latin = musculus teres major GraySubject = 123 GrayPage = 442 Caption = Muscles on the dorsum of the scapula, and the Triceps brachii muscle: #3 is Latissimus dorsi muscle #5 is Teres major muscle #6 is… …   Wikipedia

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