Lamellae (zoology)

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A lamella is a thin plate-like structure, often one amongst many lamellae very close to one another, with open space between. Aside from respiratory organs, they appear in other biological roles including filter feeding, the traction surfaces of geckos, and chloroplast membranes where high permeability is important.

In humans, the precursors of the prepuce during the development of the urinary and reproductive organs are called lamellae.

The microscopic lamellae in bone and nacre are lamellar structures in the materials science sense of the word.

In fish gills there are two types of lamellae, primary and secondary. The primary gill lamellae come out of the interbranchial septum to increase the contact area between the water and the blood capillaries. The secondary gill lamellae are small lamellae that come out of the primary ones and are used to further increase the contact area. Both types of lamellae are used to increase the amount of oxygen intake of the blood.

In birds, the water-feeding ducks and water birds have lamellae in their bills which are miniature ridges, like the 'teeth of a comb'. They act as a filter when feeding for organisms or plant matter.simple:Lamella (zoology)