| SNR | selective nerve root [block]; signal-to-noise ratio; substantia nigra zona reticulata; supernumerary... |
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| ZF | zero frequency; zinc finger [protein]; zona fasciculata |
| ZG | zona glomerulosa |
| ZP | zona pellucida |
| ZR | zona reticularis |
| PZD | Partial zona dissection |
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| SNc | Substantia Nigra zona compacta |
| ZF | Zona Fasciculata |
| ZFR | Zona fasciculata-reticularis |
| ZG | Zona glomerulosa |
| zona perforata | The perforations along the tympanic lip of the spiral lamina giving passage to the cochlear nerves. Synonym: habenulae perforata, zona perforata. (05 Mar 2000) |
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| perforata | <zoology> A division of corals including those that have a porous texture, as Porites and Madrepora; opposed to Aporosa. A division of Foraminifera, including those having perforated shells. Origin: NL. See Perforate. Source: Websters Dictionary (01 Mar 1998) |
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| habenulae perforata | The perforations along the tympanic lip of the spiral lamina giving passage to the cochlear nerves. Synonym: habenulae perforata, zona perforata. (05 Mar 2000) |
| substantia perforata anterior | A region at the base of the brain through which numerous small branches of the anterior and middle cerebral arteries (lenticulostriate arteries) enter the depth of the cerebral hemisphere; it is bordered medially by the optic chasm and anterior half of the optic tract, rostrally and laterally by the lateral olfactory stria; its anteromedial part corresponds to the olfactory tubercle. Synonym: substantia perforata anterior, locus perforatus anticus, olfactory area. (05 Mar 2000) |
| substantia perforata posterior | The bottom of the interpeduncular fossa at the base of the midbrain, extending from the anterior border of the pons forward to the mamillary bodies, and containing numerous openings for the passage of perforating branches of the posterior cerebral arteries. Synonym: substantia perforata posterior, locus perforatus posticus, Malacarne's space. (05 Mar 2000) |
| zona | Origin: L, a girdle. See Zone. A zone or band; a layer. Zona pellucida. [NL. <biology> A radiately striated membrane situated next the yolk of an ovum, or separated from it by a very delicate membrane only. Source: Websters Dictionary (01 Mar 1998) |
| zona arcuata | The inner third of the basilar membrane of the cochlear duct extending from the tympanic lip of the osseous spiral lamina to the outer pillar cell of the spiral organ (of Corti). Synonym: zona arcuata, zona tecta. (05 Mar 2000) |
| zona ciliaris | The outer, wider zone of the anterior surface of the iris, separated from the pupillary zone by the collarette. Synonym: zona ciliaris. (05 Mar 2000) |
| zona corona | An irregularly disposed collection of visible veins seen in the skin of people usually of or past middle age; it has no specific connection with any deep structure, such as the diaphragm, and no necessary connection with underlying visceral disease. Synonym: zona corona. (05 Mar 2000) |
| zona dermatica | A ridge of thickened skin surrounding the protrusion in spina bifida. (05 Mar 2000) |
| zona epithelioserosa | The membranous ring, within the zona dermatica, surrounding the protrusion in spina bifida. (05 Mar 2000) |
| zona facialis | Herpes zoster involving the face. (05 Mar 2000) |
| zona fasciculata | The wide middle zone of the adrenal cortex. This zone consists of large lipid-laden cells radially arranged in parallel cords. It converts pregnenolone to cortisol by a series of enzymatically regulated steps. A small amount of corticosterone is formed as a by-product of cortisol synthesis. (12 Dec 1998) |
| zona glomerulosa | The narrow subcapsular outer zone of the adrenal cortex. This zone consists of granular cells which stain deeply and are arranged in rounded groups. It converts pregnenolone to aldosterone by a series of enzymatically regulated steps. (12 Dec 1998) |
| zona haemorrhoidalis | The part of the anal canal that contains the rectal venous plexus. Synonym: annulus haemorrhoidalis, zona haemorrhoidalis. (05 Mar 2000) |
| zona ignea | <virology> A reactivation of the same Herpes virus that is responsible for chicken pox. This results in a painful blistery red rash that is confined to one side of the body. The zoster rash affects one nerve distribution or dermatome. Facial rash can lead to optic nerve involvement with resultant blindness. Synonym: shingles. (06 Mar 1998) |
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