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In human brain anatomy, an operculum (Latin, meaning "little lid") (pl.: opercula), may refer to the frontal, temporal, or parietal operculum, which together cover the insula as the opercula of insula. [1] It can also refer to the occipital operculum, part of the occipital lobe.
Shell of marine snail Lunella torquata with the calcareous operculum in place Gastropod shell of the freshwater snail Viviparus contectus with corneous operculum in place. The operculum (Latin for 'cover, covering'; pl. opercula or operculums) is a corneous or calcareous anatomical structure like a trapdoor that exists in many (but not all) groups of sea snails and freshwater snails, and also ...
In flowering plants, the operculum, also known as a calyptra, is the cap-like covering or "lid" of the flower or fruit that detaches at maturity. The operculum is formed by the fusion of sepals and/or petals and is usually shed as a single structure as the flower or fruit matures. [1] The name is also used for the capping tissue of roots, the ...
Operculum (lid) "Finger" that turns inside out / / / Barbs Venom Victim's skin Victim's tissues. An operculum is an anatomical feature, a stiff structure resembling a lid or a small door that opens and closes, and thus controls contact between the outside world and an internal part of an animal. Examples include:
Operculum (animal), a structure resembling a lid or a small door that opens and closes; Operculum (bird), a structure which covers the nares of some birds; Operculum (bryozoa), a lid on the orifice of some bryozoans; Operculum (fish), a flap covering the gills of bony fish; Operculum (gastropod), a sort of trapdoor used to close the aperture of ...
The rock dove's operculum is a mass at the base of the bill. The nares of some birds are covered by an operculum (plural opercula), a membraneous, horny or cartilaginous flap. [5] (p117) [47] In diving birds, the operculum keeps water out of the nasal cavity; [5] (p117) when the birds dive, the impact force of the water closes the operculum. [48]
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Some species retain gill rakers. Though all but the most primitive bony fish lack a spiracle, the pseudobranch associated with it often remains, being located at the base of the operculum. This is, however, often greatly reduced, consisting of a small mass of cells without any remaining gill-like structure. [11]