first rib


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first rib

the highest rib of the thoracic cage. It moves about the axis of its neck, raising and lowering the sternum. First rib movement during quiet breathing is negligible, but under conditions of stress it can increase the anteroposterior diameter of the chest.
References in periodicals archive ?
Mr Smith added: "After those first rib fractures had been inflicted he must have been in the most terrible pain.
Mr Smith added: "After those first rib fractures had been inflicted, he must have been in the most terrible pain.
The ligaments of the pericardium are often attached to the mandibles and parotid fascia cranially, and to the first rib or manubrium caudally" Al Qasemi added.
It is congenital abnormality located above the normal first rib.
Contrast-enhanced computed tomography (CT) and magnetic resonance angiography (MRA) are also highly sensitive for detecting focal stenosis at the level of the first rib, the presence or absence of enlarged collateral veins, and the chronicity of any thrombus present.
Hyper-abduction and retroversion of the arm, especially with sudden jerky movements can cause repetitive trauma to the endothelium of subclavian-vein [sup][2] or can strain the subclavian/axillary artery and vein causing it to be crushed between the clavicle and the first rib.
It has also resulted in rejuvenation of unpopular blocks like interscalene and axillarybrachial plexus block due to ability to visualize plexus, artery, first rib and pleura.
The neurological presentation of pain, paraesthesia, weakness, wasting of the hand muscles and the segmental distribution in conjunction with the clinical investigations (including the elevated arm stress test), investigations (a chest radiograph, magnetic resonance imaging and nerve conduction studies) and the pathology (cervical rib, fused rib) have been correlated with the surgical procedures of neurolysis with cervical or first rib resection.
Thus, once the user is happy with the sequence developed for the first rib, the same machining strategies with the same tooling can be applied across the complete network of ribs so minimising programming times.
Next (shaping) row (RS): Work in patt to 2 sts before first rib marker, k2tog, sl marker, M1, work in rib patt to 2nd marker, M1, sl marker, ssk, work in patt to end.
sup][2] Catheter fracture may be preceded by constant compression of the catheter between the clavicle and first rib (the "pinch-off sign" on chest radiograph).
The insertion of the scalenus anticus muscle on the first rib was dissected and the muscle was divided.

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