infraspinatus muscle


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in·fra·spi·na·tus mus·cle

(in'fră-spī'nŭ-tŭs mŭs'ĕl)
Origin, infraspinous fossa of scapula; insertion, middle facet of greater tubercle of humerus; action, extends arm and rotates it laterally; nerve supply, suprascapular (from fifth to sixth cervical spinal nerves).
Synonym(s): musculus infraspinatus [TA] .

infraspinatus muscle

Shoulder muscle. Origin: medial two-thirds of infraspinatus fossa of scapula. Insertion: posterior side of greater tubercle of humerus. Nerve: suprascapular (C4-C6). Action: rotates arm laterally.
See also: muscle

infraspinatus muscle

A muscle that runs from the back surface of the shoulder blade (SCAPULA) to the back of the upper part of the upper arm bone (HUMERUS). Its action is to rotate the arm outwards.

infraspinatus

infraspinous.

infraspinatus muscle
see Table 13.3.
References in periodicals archive ?
The assessing clinician was responsible for performing the history and physical assessment on all prospective participants and for clinically identifying MTrP within the infraspinatus muscle.
Suprascapular neuropathy resulting in isolated weakness and atrophy of the infraspinatus muscle could be challenging at its onset and must be differentiated from servical radiculopathy, or bone and joint diseases of the shoulder.
The path lies between the infraspinatus muscle and the teres minor muscle, with the point of entry 2 cm inferior and 1 cm medial to the posterior angle of the acromion.
If stimulation of the infraspinatus muscle was observed, or the patient reported a pain-free 'knocking' sensation in the shoulder, 15 ml of 0.
This patient was diagnosed at the chiropractic college health center with post-traumatic myofascial parascapular trigger points, myofascitis, muscular adhesions and weakness in the right shoulder musculature involving principally the infraspinatus muscle.
2) Investigators assessed 8 physical exam tests--the Neer impingement sign, Hawkins-Kennedy impingement sign, painful arc sign, supraspinatus muscle strength test, Speed's test, cross-body adduction test, drop-arm sign, and infraspinatus muscle strength test--to determine their diagnostic utility.
STIR Sagittal image showing hyperintensity in supraspinatus and infraspinatus muscles indicating edema, as a sequelae to suprascapular nerve compression.
The supraspinatus and infraspinatus muscles receive innervation from the upper trunk via the suprascapular nerve.
1 The suprascapular nerve provides motor inner-vation to the supraspinatus and infraspinatus muscles in addition to branches to the coracohumeral and cora-coacromial ligaments subacromial bursa and the acromioclavicular joint.
EMG electrodes were attached unilaterally to the upper and lower trapezius, serratus anterior and infraspinatus muscles, respectively, in accordance with Surface ElectroMyoGraphy for the Non-Invasive Assessment of Muscles (SENIAM) guidelines.
The muscle groups impacted by this injury include the deltoid and infraspinatus muscles (mainly C5) and the biceps muscle (mainly C6).