| LUSB | left upper scapular border; left upper sternal border |
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| UA | absorption unsharpness; ultra-audible; ultrasonic arteriography; umbilical artery; unauthorized abse... |
| UE | uncertain etiology; under elbow; uninvolved epidermis; upper esophagus; upper extremity |
| URI | uniform resource identifier; upper respiratory illness; upper respiratory infection |
| US | screen unsharpness ultrasonic, ultrasound; ultrasonography; unconditioned stimulus; unique sequence;... |
| lower lip | The muscular fold bounding the opening of the mouth inferiorly. Synonym: labium inferius oris. (05 Mar 2000) |
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| low lip line | The lowest position of the lower lip during the act of smiling or voluntary retraction, the lowest position of the upper lip at rest. (05 Mar 2000) |
| arterial arch of upper eyelid | Formed by communicating branches of the medial and lateral palpebral arteries. Often two arches are present, one located near the free border of the tarsal plate, the other along the upper border of the tarsus. Synonym: arcus palpebralis superior. (05 Mar 2000) |
| bones of upper extremity | The bones of the upper and lower arm. They include the clavicle and scapula. (12 Dec 1998) |
| bones of upper limb | These include the superior limb girdle (scapula and clavicle) and the skeleton of the free superior limb (humerus, radius, ulna, wrist bones, metacarpus, and bones of the fingers). Synonym: ossa membri superioris, bones of superior limb. (05 Mar 2000) |
| regions of upper limb | The topographic divisions of the upper limb: deltoid, arm, elbow, forearm, carpal region, and hand. Synonym: regiones membri superioris, regions of superior limb. (05 Mar 2000) |
| denture, complete, upper | A complete denture replacing all the natural maxillary teeth and associated maxillary structures. It is completely supported by the oral tissue and underlying maxillary bone. (12 Dec 1998) |
| elevator muscle of upper eyelid | <anatomy, muscle> Origin, orbital surface of the lesser wing of the sphenoid, above and anterior to the optic canal; insertion, skin of eyelid, tarsal plate, and orbital walls, by medial and lateral expansions of the aponeurosis of insertion; action, raises the upper eyelid; nerve supply, oculomotor. Synonym: musculus levator palpebrae superioris, elevator muscle of upper eyelid, musculus orbitopalpebralis, palpebralis. (05 Mar 2000) |
| endoscopy, upper | A procedure that enables the examiner (usually a gastroenterologist ) to examine the oesophagus (swallowing tube ), stomach, and duodenum ( first portion of small bowel ) using a thin flexible tube (a scope ) that can be looked through or seen on a TV monitor. Also known as oesophagogastroduodenoscopy or EGD. (12 Dec 1998) |
| joints of free upper limb | The joints uniting the bones of the free superior limb girdle; they are the shoulder joint, elbow joint, radioulnar joints, and joints of the wrist and hand. Synonym: articulationes membri superioris liberi, joints of free superior limb, juncturae membri superioris liberi. (05 Mar 2000) |
| upper | Being further up, literally or figuratively; higher in place, position, rank, dignity, or the like; superior; as, the upper lip; the upper side of a thing; the upper house of a legislature. The upper hand, the superiority; the advantage. See To have the upper hand, under Hand. Upper Bench, all those parts of the hull of a vessel that are properly above water. Upper world. The atmosphere. Heaven. This world; the earth; in distinction from the underworld. Source: Websters Dictionary (01 Mar 1998) |
| upper abdominal periosteal reflex | Percussing the lower margin of the costal cartilages in the nipple line causes a contraction of the ipsilateral abdominal muscles (inconstant). (05 Mar 2000) |
| upper airway | The portion of the respiratory tract that extends from the nares or mouth to and including the larynx. (05 Mar 2000) |
| upper extremity | The shoulder, arm, forearm, wrist, and hand. Synonym: membrum superius, superior limb, thoracic limb, upper extremity. (05 Mar 2000) |
| upper extremity of fibula | The superior extremity of the fibula, which articulates by a facet with the undersurface of the lateral condyle of the tibia. Synonym: caput fibulae, upper extremity of fibula. (05 Mar 2000) |