| ECP | ectrodactyly-cleft palate [syndrome]; effector cell precursor; endocardial potential; eosinophil cat... |
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| ER | efficiency ratio; epigastric region; ejection rate; electroresection; emergency room; endoplasmic re... |
| BAER | Brainstem Auditory Evoked Response(Potential) |
| AAT | Aachen Aphasia Test; academic aptitude test; alanine aminotransferase; alkylating agent therapy; alp... |
| ABER | auditory brainstem evoked response |
| meatus | <anatomy> A natural passage or canal; as, the external auditory meatus. Origin: L, a going, passage, fr. Meare to go. (11 Mar 1998) |
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| meatus acusticus externus | The passage leading inward through the tympanic portion of the temporal bone, from the auricle to the tympanic membrane; it consists of a bony (inner) portion and a fibrocartilaginous (outer) portion, the cartilaginous external acoustic meatus. Synonym: meatus acusticus externus, acoustic meatus, antrum auris, auditory canal, external auditory meatus. (05 Mar 2000) |
| meatus acusticus internus | internal acoustic meatus |
| meatus nasi | Any of three passages in the nasal cavity formed by the projection of the conchae: middle nasal meatus, lies below the inferior concha; middle nasal meatus, lies between the middle and inferior conchae; superior nasal meatus, lies between the superior and middle conchae. Synonym: meatus nasi. (05 Mar 2000) |
| meatus nasopharyngeus | The posterior part of the nasal cavity from the posterior limits of the conchae to the choanae. Synonym: meatus nasopharyngeus. (05 Mar 2000) |
| meatus urinarius | The slitlike opening of the urethra in the glans penis, the external orifice of the urethra (in the female) in the vestibule, usually upon a slight elevation, the papilla urethrae. Synonym: ostium urethrae externum, external opening of urethra, meatus urinarius, orificium urethrae externum. (05 Mar 2000) |
| spina meatus | Small bony prominence anterior to the supramastoid pit at the posterosuperior margin of the bony external acoustic meatus. Synonym: spina suprameatica, Henle's spine, meatal spine, spina meatus. (05 Mar 2000) |
| nasal meatus | Any of three passages in the nasal cavity formed by the projection of the conchae: middle nasal meatus, lies below the inferior concha; middle nasal meatus, lies between the middle and inferior conchae; superior nasal meatus, lies between the superior and middle conchae. Synonym: meatus nasi. (05 Mar 2000) |
| nervus meatus acustici externi | A branch of the auriculotemporal nerve supplying the lining of the external acoustic meatus. Synonym: nervus meatus acustici externi. (05 Mar 2000) |
| incisurae cartilaginis meatus acustici externi | (usually) two vertical fissures in the anterior portion of the cartilage of the external auditory meatus, filled by fibrous tissue. Synonym: incisurae cartilaginis meatus acustici externi, Duverney's fissures, incisurae santorini, Santorini's fissures, Santorini's incisures. (05 Mar 2000) |
| isthmus meatus acustici externi | The narrowest portion of this canal in the bony part near its deep termination. Synonym: isthmus meatus acustici externi. (05 Mar 2000) |
| opening of internal acoustic meatus | The inner opening of the internal acoustic meatus on the posterior surface of the petrous part of the temporal bone. Synonym: porus acusticus internus, internal acoustic foramen, internal acoustic pore, auditory pore, internal auditory foramen, orifice of internal acoustic meatus. (05 Mar 2000) |
| orifice of internal acoustic meatus | The inner opening of the internal acoustic meatus on the posterior surface of the petrous part of the temporal bone. Synonym: porus acusticus internus, internal acoustic foramen, internal acoustic pore, auditory pore, internal auditory foramen, orifice of internal acoustic meatus. (05 Mar 2000) |
| transverse crest of internal acoustic meatus | A horizontal ridge that divides the fundus of the internal acoustic meatus into a superior and an inferior area. In the former are the introitus of the facial canal and openings for the branches of the vestibular nerve to the utricle and to the ampullae of the anterior and lateral saemicircular canals. In the latter are openings for the cochlear nerve, and for branches of the vestibular nerve to the saccule and to the ampulla of the posterior saemicircular canal. Synonym: crista transversa, falciform crest, transverse crest. (05 Mar 2000) |
| ureteral meatus | The opening of the ureter in the bladder, situated one at each lateral angle of the trigone; wide gaping of the ostium usually indicates vesicoureteral reflux. Synonym: ostium ureteris, orificium ureteris, ureteral meatus, ureteral opening. (05 Mar 2000) |