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.
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. The assessing clinician was blinded to participants' group allocation while the treating clinician was not.
Following this, representative sagittal T1-weighted and coronal proton density images of the supraspinatus and infraspinatus muscles from each study and control group subject were selected, separated, and placed in random order.
The nerve then passes deep to this muscle in the supraspinatus fossa continuing into the spinoglenoid notch and terminates in the infraspinatus muscle. Cases of suprascapular entrapment neuropathy lead to two different clinical pictures (15).
If stimulation of the infraspinatus muscle was observed, or the patient reported a pain-free 'knocking' sensation in the shoulder, 15 ml of 0.75% ropivacaine was injected (19,20).
Safran, "High incidence of infraspinatus muscle atrophy in elite professional female tennis players," American Journal of Sports Medicine, vol.
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. He was seen seven times over a 2 month period.
They are usually identified by the distinct combination of muscle bellies involved: Suprascapular nerve entrapment at the suprascapular notch affects the supraspinatus and infraspinatus muscles; suprascapular nerve entrapment at the level of the spinoglenoid notch (distal to supraspinatus motor innervation) affects only the infraspinatus muscle; quadrilateral space syndrome (compression of the axillary nerve in the quadrilateral space) usually affects just the teres minor muscle; and ParsonageTurner Syndrome, an acute brachial neuritis, can involve single or multiple nerve distributions (Figure 10).
(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.
The path lies between the infraspinatus muscle and the teres minor muscle, with the point of entry 1 cm inferior and 2 cm medial to the posterior angle of the acromion.
found that the infraspinatus muscle is irrigated 81% of the time by the circumflex scapular artery and 94% of the time by the suprascapular artery, forming an anastomotic network between the two arteries.
His pain disappeared over a week and at 6 month follow-up there was gradual improvement in the power of supra and infraspinatus muscle.
Four patients in our study, all within the 15-30 year age group, presented with a clinical suspicion of cuff pathology, however had imaging findings consistent with edema in the supraspinatus and infraspinatus muscle bellies, with no evidence of tear / tendinitis, indicating likely suprascapular nerve denervation, which can be labeled a 'clinical mimic' of cuff tears.