Akademik

1. SYN: zone. 2. SYN: herpes zoster. [L. fr. G. zone, a girdle, one of the zones of the sphere]

- z. arcuata SYN: arcuate zone.

- z. ciliaris SYN: ciliary zone.

- z. corona SYN: costal fringe.

- z. dermatica a ridge of thickened skin surrounding the protrusion in spina bifida.

- z. epithelioserosa the membranous ring, within the z. dermatica, surrounding the protrusion in spina bifida.

- z. externa medullae renalis [TA] SYN: outer zone of renal medulla.

- z. fasciculata the layer of radially arranged cell cords in the cortical portion of the suprarenal gland, between the z. glomerulosa and z. reticularis; secretes cortisol and dehydroepiandrosterone.

- z. glomerulosa the outer layer of the cortex of the suprarenal gland just beneath the capsule; secretes aldosterone.

- z. hemorrhoidalis SYN: hemorrhoidal zone.

- zonae hypothalamicae [TA] SYN: zones of hypothalamus, under zone.

- z. incerta [TA] a flat, obliquely disposed plate of gray matter in the subthalamic region situated between the thalamic fasciculus (tegmental field H₁ of Forel) and the lenticular fasciculus (tegmental field H₂). Medially, cells of this nucleus are adjacent to the prerubral area (tegmental field H) and, laterally, they are continuous with the reticular nucleus of the thalamus. Z. i. is a derivative of the ventral thalamus; it receives afferents from the precentral motor cortex and the cerebellum.

- z. interna medullae renalis [TA] SYN: inner zone of renal medulla.

- z. lateralis [TA] SYN: lateral zone. See zones of hypothalamus, under zone.

- z. medialis [TA] SYN: medial zone. See zones of hypothalamus, under zone.

- z. medullovasculosa the fissured segment of the spinal cord that dorsally closes the sac in meningomyelocele.

- z. ophthalmica herpes zoster in the distribution of the ophthalmic nerve.

- z. orbicularis (articulationis coxae) [TA] fibers of the articular capsule of the hip joint encircling the neck of the femur. SYN: orbicular zone of hip joint, ring ligament, zonular band.

- z. pectinata SYN: pectinate zone.

- z. pellucida an extracellular coat, rich in glycoprotein, surrounding the oocyte; it contains microvilli of the oocyte and cellular processes of follicular cells and appears homogeneous and translucent under the light microscope. SYN: pellucid zone.

- z. perforata SYN: foramina nervosa, under foramen.

- z. periventricularis [TA] SYN: periventricular zone. See zones of hypothalamus, under zone.

- z. pupillaris SYN: pupillary zone.

- z. radiata SYN: z. striata.

- z. reticularis the inner layer of the cortex of the adrenal gland, where the cell cords anastomose in a netlike fashion.

- z. striata the thickened cell membrane of the ovum in forms, such as certain amphibia, in which it appears radially striated under the light microscope; with the electron microscope the striations can be seen to be microvilli. SYN: membrana striata, striated membrane, z. radiata.

- z. tecta SYN: arcuate zone.

- z. transitionalis analis [TA] SYN: anal transitional zone.

- z. vasculosa SYN: vascular zone.

zo·na 'zō-nə n, pl zo·nae -.nēalso -.nī or zonas

1) an anatomical zone or layer esp ZONA PELLUCIDA

2) SHINGLES