| AAM | acute aseptic meningitis; American Academy of Microbiology; amino acid mixture; African American Mal... |
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| AAMS | acute aseptic meningitis syndrome |
| ACM | acetaminophen; acute cerebrospinal meningitis; Adriamycin, cyclophosphamide, methotrexate; albumin- ... |
| AMS | ablepharon-microstomia syndrome; acute mountain sickness; adenosylmethionine synthetase; aggravated ... |
| AS | acetylstrophanthidin; acidified serum; acoustic schwannoma; acoustic stimulation; active sarcoidosis... |
| basilar apophysis | The part of the occipital bone that lies anterior to the foramen magnum and joins with the body of the sphenoid bone. Synonym: pars basilaris ossis occipitalis, basal part of occipital bone, basilar apophysis, basilar process of occipital bone, basilar process, basiocciput. (05 Mar 2000) |
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| basilar artery | <anatomy, artery> Supplies the pons and gives rise to the vertebral arteries, Provides branches to the cerebrum and cerebellum. (27 Sep 1997) |
| basilar bone | The developmental basilar process of the occipital bone which unites with the condylar portions in about the fourth or fifth year, becoming the basilar part of the occipital bone. Synonym: basioccipital bone, os basilare. (05 Mar 2000) |
| basilar cartilage | The cartilage filling the foramen lacerum. Synonym: basilar fibrocartilage, fibrocartilago basalis. (05 Mar 2000) |
| basilar cell | <pathology> General term for relatively undifferentiated cells in an epithelial sheet that give rise to more specialised cells act as stem cells). In the stratified squamous epithelium of mammalian skin the basal cells of the epidermis (stratum basale) give rise by an unequal division to another basal cell and to cells that progress through the spinous, granular and horny layers, becoming progressively more keratinised, the outermost being shed as squames. In olfactory mucosa the basal cells give rise to olfactory and sustentacular cells. In the epithelium of epididymis their function is unclear, but they probably serve as stem cells. (13 Nov 1997) |
| basilar crest of cochlear duct | An inward projection of the spiral ligament of the cochlea to which is attached the basilar membrane forming the floor of the cochlear duct. Synonym: crista basilaris ductus cochlearis. (05 Mar 2000) |
| basilar fibrocartilage | The cartilage filling the foramen lacerum. Synonym: basilar fibrocartilage, fibrocartilago basalis. (05 Mar 2000) |
| basilar impression | An invagination of the base of the skull into the posterior fossa with compression of the brainstem and cerebellar structures into the foramen magnum. Compare: platybasia. (05 Mar 2000) |
| basilar index | Ratio between the basialveolar line and the maximum length of the cranium, according to the formula: (basialveolar line × 100)/length of cranium. Synonym: alveolar index. (05 Mar 2000) |
| basilar interstitial lung disease | <radiology> B bronchiectasis, A asbestosis, D drugs / DIP, L lymphangitic metastasis / LAM, A aspiration, S sarcoidosis, S scleroderma (12 Dec 1998) |
| basilar invagination | <radiology> Dens projects into base of skull, McGregor's line greater than 4.5 mm, Chamberlain's line greater than 3 mm, may lead to obstructive hydrocephalus aetiology: primary anomalies of occiput, atlas, axis, softened bone: rickets / osteomalacia, Paget's disease, fibrous dysplasia, dysostoses: OI, achondroplasia, cleidocranial dysostosis Cf: platybasia (12 Dec 1998) |
| basilar lamina | A thin layer of tissue covered with mesothelial cells that separates the cochlea from the scala tympani in the ear. (18 Nov 1997) |
| basilar membrane | A thin layer of tissue covered with mesothelial cells that separates the cochlea from the scala tympani in the ear. (18 Nov 1997) |
| basilar migraine | A migraine accompanied by transient brainstem signs (vertigo, tinnitus, perioral numbness, diplopia, etc.) thought to be due to vasospastic narrowing of the basilar artery. (05 Mar 2000) |
| basilar part of pons | The large ventral part of the pons occupied by the nuclei pontis, traversed longitudinally by corticopontine, corticobulbar, and corticospinal fibres, and transversely by pontocerebellar fibres. Pontocerebellar fibres converging laterally form the middle cerebellar peduncle or brachium pontis. Synonym: pars ventralis pontis, anterior part of pons, basilar part of pons, pars basilaris pontis. (05 Mar 2000) |