operculum

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operculum

 [o-per´ku-lum] (L.)
1. a lid or covering.
2. the folds of pallium from the frontal, parietal, and temporal lobes of the cerebrum overlying the insula. adj., adj oper´cular.
dental operculum the hood of gingival tissue overlying the crown of an erupting tooth.
trophoblastic operculum the plug of trophoblast that helps close the gap in the endometrium made by the implanting blastocyst.

o·per·cu·lum

, gen.

o·per·cu·li

, pl.

o·per·cu·la

(ō-per'kyū-lŭm, -lī, -lă),
1. Anything resembling a lid or cover.
2. In anatomy, the portions of the frontal (operculum frontale [TA], frontal operculum [TA]), parietal (operculum parietale [TA], parietal operculum [TA]), and temporal (operculum temporale [TA], temporal operculum [TA]) lobes bordering the lateral sulcus and covering the insula.
3. In parasitology, the lid or caplike cover of the shell opening of operculated freshwater snails in the subclass Prosobranchiata, and of the eggs of certain trematode and cestode parasites.
4. The attached flap in the tear of retinal detachment.
5. The mucosal flap partially or completely covering an unerupted tooth.
[L. cover or lid, fr. operio, pp. opertus, to cover]

operculum

/oper·cu·lum/ (o-per´ku-lum) pl. oper´cula   [L.]
1. a lid or covering.
2. the folds of pallium from the frontal, parietal, and temporal lobes of the cerebrum overlying the insula.oper´cular

dental operculum  the hood of gingival tissue overlying the crown of an erupting tooth.
trophoblastic operculum  the plug of trophoblast that helps close the gap in the endometrium made by the implanting blastocyst.

operculum

(ō-pûr′kyə-ləm)
n. pl. opercu·lums or opercu·la (-lə)
1. Something resembling a lid or cover.
2. The portions of the frontal, parietal, and temporal lobes covering the insula.
3. A bit of mucus sealing the endocervical canal of the uterus after conception.
4. The attached flap in cases of torn retinal detachment.

o·per′cu·lar (-lər) adj.

operculum

[ōpur′kyoo͡ləm] pl. opercula, operculums
Etymology: L, lid
a lid or covering, such as the mucous plug that blocks the cervix of the gravid uterus or the temporal operculum of the cerebral temporal hemisphere that overlaps the insula as an extension of the superior surface of the temporal lobe. opercular, adj.

o·per·cu·lum

, pl. opercula (ō-pĕr'kyū-lŭm, -lă) [TA]
1. Anything resembling a lid or cover.
2. [TA] anatomy The portions of the frontal, parietal, and temporal lobes bordering the lateral sulcus and covering the insula.
3. Mucus sealing the endocervical canal of the uterus after conception has taken place.
4. parasitology The lid or caplike cover of the shell opening of operculated freshwater snails in the subclass Prosobranchiata, and of the eggs of certain trematode and cestode parasites.
5. The attached flap in the tear of retinal detachment.
6. The mucosal flap partially or completely covering a partially erupted tooth.
[L. cover or lid, fr. operio, pp. opertus, to cover]

operculum

A covering membrane, flap or lid of tissue, especially in the brain, or over an erupting tooth.

operculum

  1. the lid of a MOSS capsule.
  2. a hard bony flap covering the gills of fishes.
  3. the plate of exoskeletal material on the foot of a gastropod mollusc with which it closes off the entrance to the shell.

operculum 

A flap of detached retina which projects forward, or is totally free in the vitreous. It can happen as a result of a retinal tear (break).

o·per·cu·lum

, pl. opercula (ō-pĕr'kyū-lŭm, -lă) [TA]
1. [TA] The mucosal flap partially or completely covering an unerupted tooth.
2. Anything resembling a lid or cover.
[L. cover or lid, fr. operio, pp. opertus, to cover]

operculum (ōpur´kūləm),

n a flap of tissue over a partially erupted or unerupted tooth, particularly a third molar. It may result in pericoronitis with inflammation of the flap tissue. See also pericoronitis.

operculum

pl. opercula [L.]
1. a lid or covering.
2. the folds of pallium from the frontal, parietal and temporal lobes of the cerebrum overlying the insula.
3. gill cover in a fish.

dental operculum
the hood of gingival tissue overlying the crown of an erupting tooth.
trophoblastic operculum
the plug of trophoblast that helps close the gap in the endometrium made by the implanting blastocyst.
References in periodicals archive ?
Sagittal otoliths, scales, opercula, and vertebrae were removed and stored for processing.
The opercula for this study were collected ancillary to the biological samples gathered and analyzed by Stoner et al.
Opercula from our dissected channeled whelk were removed with a scalpel, labeled, and stored in 10% formalin for 1 week, and then transferred to 70% EtOH.
Two opercula widely separated, with gap of about half to two-thirds as wide as operculum.
Arching of the abdomen produces a space between the opercula and abdomen during production of the song.
Male genital anterior operculum with long, curved setae (some reaching the genital opening); one pair of slit sensilla on anterior and posterior opercula, posterior operculum with smaller sensilla.
Two opercula apart from each other, of which gap is about 1/4-1/3 as wide as operculum.
The genital opercula are typical of the group although the anterior arms are broader than in other members of this group.
spinosa species group is characterized by the head wider than the mesonotum, the male opercula widely apart from each other, the male abdomen longer than twice as long as maximum width of the mesonotum, the sternite VII narrowed posteriorly, and the uncus with a distinct ridge from one uncal lobe to the other, encircling the area where the uncal lobes meet medially (Beuk 1999).
4) From 7 to 11 DAH: Opercula are formed, caudal fin is well-developed, the mouth opening and closing indicates formed jaws, trunk muscles can be observed in cross bands formed in sides of the body, single pore air bladder is oval and air filled, the mouth movements are slow (Figs 1F & G).
Two opercula nearly touching each other in the middle.
Knobbed whelk length at age has been recorded from captive specimens and from examination of annual growth marks identified on opercula.