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...

Golgi apparatus (3-D illustration)
Role of Golgi Apparatus & Endoplasmic Reticulum in Protein Synthesis

The endoplasmic reticulum and Golgi apparatus are the organelles involved in the translation step of protein synthesis a..

green leaf - close up view
Leaves

Leaves are the major photosynthetic organ of a plant. Apart from that, they are also crucial to water movement. In this ..

running freshwater community
Running Water Freshwater Community Factors

This tutorial noted some of the physical and chemical factors that provide the framework of a running water community in..

Sensory systems
Sensory Systems

A sensory system is a part of the nervous system consisting of sensory receptors that receive stimuli from the internal ..

Protein (illustration)
Protein Variety

The sequence of amino acids determines the type of protein. Protein is synthesized according to the sequence of nucleoti..

Homeostasis by water regulation
Homeostasis of Organism Water Regulation

Osmoregulation is the regulation of water concentrations in the bloodstream, effectively controlling the amount of water..