Zona

(zo/- nah). I. A zone; a belt or girdle. A name given to certain spaces traversing the cortical envelop of the kidney, as Z. glomerasa, Z. faseiculata, Z. reticular is, etc. 2. II erpea roster. Z. alba, the white zone of the eyeball. ZSl.LNER'S Z. arcuata, the inner zone of the basilar brane extending from the lower edge of the spiral ve of the cochlea to the external edge of the base of The outer rods of Corti. Z. cartilaginea, the limbus of the spiral lamina. Z. choriacea. Same as Z. ciliaris, the ciliary zone, or ciliary proce es collectively:the zone of Zinn, or the suspensory ligament of die crystalline lens; a radially plicated modified anterior continuation of the hyaloid membrane of the vitreous body (Piersol). Z. denticulata, the inner zone of the basilar membrane, together with the limbus of the spiral lamina. Z. fasciculata, the central portion of the cortex of the suprarenal capsule, composed of tube-like transverse bands. Z. ganglion aris, a collection of gray matter on the filaments of the cochlear branch of the auditory nerve. Z. glomerulosa, a zone of the cortical portion of the suprarenal capsule, which has a net-like appearance on section, situated near the surface of the organ. Z. ignea. Synonym of Herpes zoster. Z. incerta. See Regio sub thalamic a. Z. laevis. Same as Z. arcuata. Z. median a. Same as Z. cartilaginea. Z. nerve a. Same as Z. arcuata. Z. orbicularis, a thickening of the capsular ligament around the acetabulum. Z. pectin at a, the outer zone of the basilar membrane, extending from the rods of Corti to the spiral ligament. Z. pellucid a, the thick, solid, elastic envelop of the ovum, to the cell-wall of a cell. It is also called the vitelline membrane. It contains the us or yolk, corresponding to the cell-contents of the cell; the Germinal Vesicle (corresponding to the nucleus of the cell), which last contains the Germinal Spot, corresponding to the cell-nucleolus. Z. per for at a, the lower edge of the spiral groove of the cochlea. Z. per for at a of the Cochlea, the inner and perforated division of the lamina spiral is membranacea. Z. radiata, the zona pellucid a when the radiating pore-canals are very distinct. Z. repens. Same as Herpes zoster. Z., reticular is: I. The portion of the cortex of the suprarenal capsule next to the medullary portion. Here the spaces formed by the transverse bands are of small extent. 2. The inner layer of the cortical portion of the suprarenal body. Z.