collarette


Also found in: Dictionary.
Related to collarette: epidermal collarette

collarette

 [kol″er-et´]
1. a narrow rim of loosened keratin overhanging the periphery of a circumscribed skin lesion, attached to the normal surrounding skin.
2. an irregular jagged line dividing the anterior surface of the iris into two regions, the pupillary zone and the ciliary zone.
From Dorland's, 2000.
Biett's collarette a type of papular syphilid in which the central papule is surrounded by a ring of scales.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

col·lar·ette

(kol'er-et'),
1. The sinuous, scalloped line in the iris that divides the central pupillary zone from the peripheral ciliary zone and marks the embryonic site of the atrophied minor vascular circle of the iris.
2. Brittle scales encircling eyelashes in staphylococcal blepharitis.
Synonym(s): iris frill
Farlex Partner Medical Dictionary © Farlex 2012
Dermatology A rim of thickened epidermis in pyogenic granuloma, which is morphologically similar to the pincer-like surrounding epidermis of lichen nitidus and keratoacanthoma
Mycology A rim of cell wall material at the tip of a phialide, resulting from the tip’s rupture during the release of the first phialoconidium
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

collarette 

Line separating the pupillary zone and the ciliary zone which can be seen on the anterior surface of the iris. In the normal iris it is an irregular circular line lying about 1.5 mm from the pupillary margin (Fig. C13). See minor arterial circle of the iris; crypts of Fuchs.
Fig. C13 Coloboma of the irisenlarge picture
Fig. C13 Coloboma of the iris
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive ?
Ulceration and lateral collarette of the epidermis are present.
A low-power view shows a polypoid mass with a collarette of epithelium, centrally ulcerated.
Another condition that accompanies PPM is the presence of sheets that move away from the iris collarette and remain freely floating in the anterior chamber without adhering to any other structure.
Inclusion criteria were adopted based on clinical diagnosis of bacterial pyoderma caused by Staphylococcus intermedius in dogs, characterized with moderate to severe lesions presented with papular eruptions, erythema, pustules, ulceration/ erosion, purulent discharge and epidermal collarette. Confirmation of pathogenic bacteria was done by culturing sample collected at infection site.
On the top of these lesions, Biett's collarette was presented typically to be a central clearing and a rim of collarette scales (Fig.
Remarks: Lateral face, hemispherical shell, domed, slightly wavy, with border at the edge of the shell and buccal tube external to the shell, with collarette at the extremity of the pseudostoma.
The features that are most useful for distinguishing among Mucorales are the presence of the rhizoids, the shape of sporangium, the length of sporangiophore, and the shape of columella, the presence or absence of apophysis and collarette, and the organization and branching of stolons (3-12).
When located on the skin they have a fine scale, like a collarette on the surface and on the mucous membranes, and they usually erode.
PG may have polypoid appearance and often develop a stalk or collarette of scale at the base.
This displacement was more marked dorsally where the iris billowed forward more prominently at the collarette region than at the iris root or pupillary margin (Figs 1 and 2).
New from Suttons is dahlia Yankee Doodle Dandy, a semi-double mixture of 'collarette' types in a good range of colours.
Parade-goers carried the orange collarette, a small V-shaped sash worn around the neck.