Dictionary > Basal lamina

Basal lamina

(histology) A layer of extracellular matrix found on the basal surface of epithelial cells, and which is secreted by the epithelial cells.
(embryology) The ventral plate of the embryonic neural tube that gives rise to somatic and visceral motor neurons.
In histology, basal lamina is composed of electron-dense layer called lamina densa (composed of type IV collagen) and electron-lucid layers called lamina lucida (made up of laminin, integrins, entactins, and dystroglycans) together make up the basal lamina.
The term “basal lamina” is usually used with electron microscopy, while the term “basement membrane” is usually used with light microscopy. That is because basal lamina is readily visible as distinct structure with the electron microscope, and not with a light microscope. In strict sense, basal lamina is different from basement membrane based on their components. The basal lamina is composed of lamina densa and lamina lucida whereas the basement membrane is composed of lamina densa and lamina reticularis; hence, the basement membrane includes only a portion of basal lamina, and including a layer not found in basal lamina.
Derived terms:

  • basal lamina of choroid
  • basal lamina of ciliary body
  • basal lamina of cochlear
  • basal lamina of neural tube
  • basal lamina of saemicircular duct
  • junctional basal lamina

Synonym: ventral plate of neural tube (embryology).

Compare: basement membrane.

You will also like...

Lights' Effect on Growth
Lights’ Effect on Growth

This tutorial elaborates on the effect of light on plant growth. It describes how different plants require different amo..

Biological Cell schematic diagram
Biological Cell Introduction

It only takes one biological cell to create an organism. A single cell is able to keep itself functional through its 'mi..

Photosynthesis and respiration
Plant Metabolism

Plants are responsible for incredible feats of molecular transformation. Plant processes, such as photosynthesis, photop..

Biological Cell Defense
Biological Cell Defense

Organisms employ different strategies to boost its defenses against antigens. Humans have an immune system to combat pat..


The circulatory system is key to the transport of vital biomolecules and nutrients throughout the body. Learn about the ..

Still Water Animals
Still Water Animals

Animals living in aquatic habitats have diversified and evolved through time. They eventually occupy ecological niches a..