Dictionary > Lacuna

Lacuna

Definition
noun, plural: lacunae
(histology) The small cavity containing an osteocyte in bone, or a chondrocyte in cartilage; a minute cavity containing a nucleate cell
(botany) An air space in plant tissues
(general) A small depression, empty space, or cavity
lacunar (adjective)
Of, pertaining to, or relating to a lacuna
Supplement
Lacuna is a Latin word derived from lacus meaning lake. Thus, in biology, it is a term pertaining to a small depression or cavity and supposedly containing a nucleate cell. In histology or anatomy, lacuna (plural: lacunae) refers to the small cavity in the substance of the bone containing an osteocyte. Osteocyte is an entrapped osteoblast in the matrix. It may also be used to refer to the small cavity containing a chondrocyte in a cartilage tissue. The latter is called cartilage lacuna. In the bone, the lacunae are located between the lamellae. When viewed under an ordinary microscope, they appear as spots in the bone tissue. They are opaque and have a fusiform shape. They are occupied by an osteocyte and are connected to each other by canaliculi (small canals or ducts). In cartilages, the chondrocytes occupy lacunae. Surrounding the chondrocyte is the so-called capsule. In botany, lacunae pertain to the air spaces in plant tissues.
Word origin: Latin lacūna ‎(“ditch, gap”), lacus ‎(“lake”)
Related term(s):


You will also like...

Sugar Homeostasis
Sugar Homeostasis

The blood sugar level is regulated by two hormones. The mechanism behind this type of negative feedback control is descr..

Pollution in Freshwater Ecosystems
Pollution in Freshwater Ecosystems

There are many environmental factors that arise due to the usage of water in one way or another and for every action tha..

green plant cells
Plant Cells vs. Animal Cells

Plant cells have plastids essential in photosynthesis. They also have an additional layer called cell wall on their cell..

Schematic diagram of DNA replication
DNA Structure & DNA Replication

DNA is a double helix structure comprised of nucleotides. A nucleotide, in turn, is made up of phosphate molecule, deoxy..

Evolution of Life - Ancient Earth
Evolution of Life – Ancient Earth

Autotrophs flourished, absorbing carbon and light. Soon after, primitive life forms that could assimilate oxygen thrived..

Birth Control and Contraception
Birth Control and Contraception

Different pregnancy and birth control and contraception strategies are described. Read this tutorial to learn each of th..