|
Maculation
A macula is a spot on the retina of the human eye. Macula may also refer to: Science and medicine * Macula (archaeology), a feature visible on an aerial photograph but with no identifiable function * Macula (planetary geology), a dark area on the surface of a planet or moon * Macula of saccule, in the human ear * Macula of utricle, in the human ear * Macula adhaerens, a cell structure specialized for cell-to-cell adhesion * Macula densa, a group of cells in the kidney that stain darker histologically Species * ''Astylopsis macula'', a beetle of family Cerambycidae * '' Gibberula macula'', a sea snail of family Cystiscidae * '' Goniotorna macula'', a moth of family Tortricidae * ''Ortalotrypeta macula'', a fruit fly of family Tephritidae * ''Schrankia macula ''Schrankia macula'', the black-spotted schrankia moth, is a moth of the family Erebidae. The species was first described by Herbert Druce in 1891. It is found from North America (including Alabama, Arizona, California, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Macula
The macula (/ˈmakjʊlə/) or macula lutea is an oval-shaped pigmented area in the center of the retina of the human eye and in other animals. The macula in humans has a diameter of around and is subdivided into the umbo, foveola, foveal avascular zone, fovea, parafovea, and perifovea areas. The anatomical macula at a size of is much larger than the clinical macula which, at a size of , corresponds to the anatomical fovea. The macula is responsible for the central, high-resolution, color vision that is possible in good light; and this kind of vision is impaired if the macula is damaged, for example in macular degeneration. The clinical macula is seen when viewed from the pupil, as in ophthalmoscopy or retinal photography. The term macula lutea comes from Latin ''macula'', "spot", and ''lutea'', "yellow". Structure The macula is an oval-shaped pigmented area in the center of the retina of the human eye and other animal eyes. Its center is shifted slightly away from the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Macula (archaeology)
Macula is a term used by archaeologists to describe small two-dimensional features of ancient human origin visible on an aerial photograph, such as points, spots or patches, which may represent features such as burial places, pits, Grubenhäuser (homesteads with sunken floors), constructions based on posthole In archaeology a posthole or post-hole is a cut feature used to hold a surface timber or stone. They are usually much deeper than they are wide; however, truncation may not make this apparent. Although the remains of the timber may survive, most p ... or features above ground level. Maculae are differentiated from other features visible in aerial photographs such as enclosures, linear features and linear systems, which include path, roads, boundaries or limits. Identification and interpretation of maculae in air photographs is difficult and depends upon the experience of the observer, who has to take factors such as shape, size, relative position or proximity to other macula ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Macula (planetary Geology)
Macula (pl. maculae ) is the Latin word for 'spot'. It is used in planetary nomenclature to refer to unusually dark areas on the surface of a planet or moon. They are seen on the icy surfaces of Pluto, Jupiter's moon Europa, Saturn's moon Titan, Neptune's moon Triton, and Pluto's moon Charon In Greek mythology, Charon or Kharon (; grc, Χάρων) is a psychopomp, the ferryman of Hades, the Greek underworld. He carries the souls of those who have been given funeral rites across the rivers Acheron and Styx, which separate the wo .... The term was adopted for planetary nomenclature when high resolution pictures of Europa revealed unusual new surface features. Notes Links * Lists of named maculaeon Europa [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Macula Of Saccule
The saccule is the smaller sized vestibular sac (the utricle being the other larger size vestibular sac); it is globular in form, and lies in the recessus sphæricus near the opening of the scala vestibuli of the cochlea. Its anterior part exhibits an oval thickening, the macula of saccule (or saccular macula), to which are distributed the saccular filaments of the acoustic nerve. The vestibule is a region of the inner ear which contains the saccule and the utricle, each of which contain a macula to detect linear acceleration. Its function is to detect vertical linear acceleration. The macula of saccule lies in a nearly vertical position. It is a 2mm by 3mm patch of hair cells. Each hair cell of the macula contains 40 to 70 stereocilia and one true cilia, called a kinocilium. A gelatinous cover called the otolithic membrane envelops the tips of the stereocilia and kinocilium. The otolithic membrane is weighted with small densely packed protein- calcium carbonate granules call ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Macula Of Utricle
The utricle and saccule are the two otolith organs in the vertebrate inner ear. They are part of the balancing system (membranous labyrinth) in the vestibule of the bony labyrinth (small oval chamber). They use small stones and a viscous fluid to stimulate hair cells to detect motion and orientation. The utricle detects linear accelerations and head-tilts in the horizontal plane. The word utricle comes . Structure The utricle is larger than the saccule and is of an oblong form, compressed transversely, and occupies the upper and back part of the vestibule, lying in contact with the recessus ellipticus and the part below it. Macula The macula of utricle (macula acustica utriculi) is a small (2 by 3 mm) thickening lying horizontally on the floor of the utricle where the epithelium contains vestibular hair cells that allow a person to perceive changes in latitudinal acceleration as well as the effects of gravity; it receives the utricular filaments of the acoustic nerve. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Desmosome
A desmosome (; "binding body"), also known as a macula adherens (plural: maculae adherentes) (Latin for ''adhering spot''), is a cell structure specialized for cell-to-cell adhesion. A type of junctional complex, they are localized spot-like adhesions randomly arranged on the lateral sides of plasma membranes. Desmosomes are one of the stronger cell-to-cell adhesion types and are found in tissue that experience intense mechanical stress, such as cardiac muscle tissue, bladder tissue, gastrointestinal mucosa, and epithelia. Structure Desmosomes are composed of desmosome-intermediate filament complexes (DIFC), which is a network of cadherin proteins, linker proteins and intermediate filaments. The DIFCs can be broken into three regions: the extracellular core region, or desmoglea, the outer dense plaque, or ODP, and the inner dense plaque, or IDP. The extracellular core region, approximately 34 nm in length, contains desmoglein and desmocollin, which are in the cadherin famil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Macula Densa
In the kidney, the macula densa is an area of closely packed specialized cells lining the wall of the distal tubule, at the point where the thick ascending limb of the Loop of Henle meets the distal convoluted tubule. The macula densa is the thickening where the distal tubule touches the glomerulus. The cells of the macula densa are sensitive to the concentration of sodium chloride in the distal convoluted tubule. A decrease in sodium chloride concentration initiates a signal from the macula densa that has two effects: (1) it decreases resistance to blood flow in the afferent arterioles, which raises glomerular hydrostatic pressure and helps return the glomerular filtration rate (GFR) toward normal, and (2) it increases renin release from the juxtaglomerular cells of the afferent and efferent arterioles, which are the major storage sites for renin. As such, an increase in sodium chloride concentration would result in vasoconstriction of afferent arterioles, and reduced paracr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Astylopsis Macula
''Astylopsis macula'' is a species of longhorn beetles of the subfamily Lamiinae. It was described by Say in 1826. at ITIS. References Beetles described in 1826 Acanthocinini {{Acanthocinini-stub ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gibberula Macula
''Gibberula macula'' is a species of very small sea snail, a marine gastropod mollusk or micromollusk in the family Cystiscidae Cystiscidae is a taxonomic family of minute sea snails, marine gastropod mollusks or micromollusks. Description The shell is minute to large, either white, uniformly colored, or patterned; the surface is smooth, sculptured, or axially costate; .... Description The length of the shell attains 1.77 mm. Distribution This species occurs in the Caribbean Sea off Panama. References macula Gastropods described in 2009 {{Cystiscidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ortalotrypeta Macula
''Ortalotrypeta macula'' is a species of tephritid or fruit flies in the genus ''Ortalotrypeta'' of the family Tephritidae The Tephritidae are one of two fly families referred to as fruit flies, the other family being the Drosophilidae. The family Tephritidae does not include the biological model organisms of the genus ''Drosophila'' (in the family Drosophilidae), w .... References Tachiniscinae {{Tephritidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Schrankia Macula
''Schrankia macula'', the black-spotted schrankia moth, is a moth of the family Erebidae. The species was first described by Herbert Druce in 1891. It is found from North America (including Alabama, Arizona, California, Florida, Georgia, Indiana, Louisiana, Maryland, Massachusetts, Mississippi, Missouri, North Carolina, Oklahoma, South Carolina, Tennessee, Texas and Virginia) to Central America. The wingspan is 13–18 mm. The forewings are dark brown or gray except for a yellowish area beyond the postmedian line. The hindwings are light gray with an indistinct median line. The larvae feed on a species of bracket fungus A bracket is either of two tall fore- or back-facing punctuation marks commonly used to isolate a segment of text or data from its surroundings. Typically deployed in symmetric pairs, an individual bracket may be identified as a 'left' or 'r .... References Moths described in 1891 Hypenodinae {{Noctuoidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
