tapetum

[tah-pe´tum] (L.)

1. a covering structure or layer of cells.

2. a stratum in the human brain composed of fibers from the body and splenium of the corpus callosum sweeping around the lateral ventricle.

tapetum lu´cidum the iridescent epithelium of the choroid of animals that gives their eyes the property of shining in the dark.

ta·pe·tum

, pl.

ta·pe·ta

(tă-pē'tŭm, -tă), [TA]

1. In general, any membranous layer or covering.

2. neuroanatomy a thin sheet of fibers in the lateral wall of the temporal and occipital horns of the lateral ventricle, continuous with the corpus callosum. Synonym(s): Fielding membrane, membrana versicolor

3. A dense layer in the choroidea of the eye of many mammalian species, including the cat and dog but not humans, which forms a discrete or diffuse area of reflective cells, rodlets, and fibers; its strong light-reflecting properties cause the metallic hue and light-glow of such eyes in the dark.

[L. tapeta, a carpet]

Farlex Partner Medical Dictionary © Farlex 2012

tapetum

(tə-pē′təm)

n. pl. tape·ta (-tə)

Anatomy

a. A reflective membrane in the back of the eye of many animals that are active during low-light conditions.

b. A layer of fibers of the corpus callosum forming the roof of part of the lateral ventricle of the brain.

ta·pe′tal (-pēt′l) adj.

ta·pe·tum

, pl. tapeta (tă-pē'tŭm, -tă) [TA]

1. In general, any membranous layer or covering.

2. [TA] neuroanatomy A thin sheet of fibers in the lateral wall of the temporal and occipital horns of the lateral ventricle, continuous with the corpus callosum.

[L. tapeta, a carpet]

Medical Dictionary for the Health Professions and Nursing © Farlex 2012

tapetum

a nutritive layer surrounding those cells which will become MICROSPORES. The tapetum is found in a wide range of vascular plants, from FERNS to ANGIOSPERMS. In the latter, a tapetal layer is found in the pollen sacs of the ANTHER.
a layer of specialized reflective cells in the choroid of the EYE, especially noticeable in the eyes of cats.

Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

Fielding,

George H., English anatomist, 1801-1871.

Fielding membrane - in neuroanatomy, a thin sheet of fibers in the lateral wall of the temporal and occipital horns of the lateral ventricle, continuous with the corpus callosum. Synonym(s): tapetum

Medical Eponyms © Farlex 2012

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References in periodicals archive

It is interesting that abnormal phenomena in the tapetum of sterile plants were observed during metaphase period of the development of the wall of pollen sac.

However, in fertile plants, the middle layers gradually dissociated and were finally absorbed by the tapetum (Fig.6II).

Cytological Studies of Anther Development of the Double Recessive Genetic Male Sterile Line, ms5ms6, of Upland Cotton (Gossypium hirsutum)

anther wall followed the dicotyledonous type, which was composed of an epidermal layer, an endothelial layer, one middle layer and tapetum which is consistent with Davis 1966 and bagheri 2014.

A sharp correlation was observed between division in microspore mother cells (M.M.Cs) and development of anther's tapetum. That was reported for other dicotyledonous plant [6,13,10].

A study of anther development in Azalea alexander L

To date our knowledge is insufficient to provide plausible answers to why many plants produce orbicules and why they are absent in several evolutionary successful lineages, even when they are characterized by a parietal tapetum type (e.g.

The current study aims at (1) providing a summary of all data available on orbicule presence/absence in the flowering plants; (2) identifying patterns in the distribution data by mapping them on a recent angiosperm classification; (3) discussing correlations with tapetum types, pollination syndromes and other traits.

Orbicules in flowering plants: a phylogenetic perspective on their form and function

The tapetum showed visible signs of degeneration between the late microspore stage (Fig.

Initial differences noted were a greater disorganization of the cytoplasmic organelles in both the cells of the tapetum and parietal layer (Fig.

Genetics and Cytology of a New Male-Sterile, Female-Fertile Soybean Mutant

In dogs with absence of tapetum, position of OD could not be differentiated.

Ocular Funduscopy of Different Canine Breeds in India - A Clinical Study of 70 Normal Dogs

Records of tapetum type in monocotyledons and some "primitive" dicotyledons, both new and from the literature, are given in Table I.

The tapetum and systematics in monocotyledons

On maturation of the anther, the sporangial wall consists of the epidermis and the endothecium, whereas the middle layers and tapetum disintegrate.

Pollen and anther development in Ziziphus jujuba L

All papers under "Tapetum" in the subject index were checked for information about orbicules.

Orbicules in angiosperms: morphology, function, distribution, and relation with tapetum types