Biology

Epidermis Definition: The epidermis is the outer layer of the three layers that make up the skin, the inner layers being the dermis and hypodermis.…

Metencephalon Definition: Metencephalon is generally considered a part of the brain that largely consists of the brain’s cerebellum and pons. It contains a portion of…

Lymphatic System Definition: Lymphatic System is a collection of organs, tissues, ducts, and vessels that help to make or transport lymph. Lymph is a clear-to-white…

Vitex Peduncularis Plant Vitex is a genus of about 250 species of shrubs and trees from 1-35 m tall, native to tropical, subtropical and also…

Active Transport Definition Active transport is the movement of ions or molecules across a cell membrane in the direction opposite that of diffusion, that is,…

Potassium Channel Definition Potassium channels are designed to allow the flow of potassium ions across the membrane but to block the flow of other ions–in…

Endothelium Definition The endothelium is a thin layer of flat cells lining the closed internal spaces of the body such as the inside of blood…

Microglia Definition Microglia is any of the small neuroglial cells of the central nervous system (CNS) having long processes and ameboid and phagocytic activity at…

Subthalamic Nucleus Definition Subthalamic nucleus is a circumscript nucleus that is located in the ventral part of the subthalamus, receives a massive projection from the…

Basal Ganglia Definition Basal ganglia are a region of the base of the brain that consists of three clusters of neurons that are responsible for…

Striatum Definition Striatum is a subcortical part of the forebrain and a critical component of the reward system. It is also known as the neostriatum…

Premotor Cortex Definition Premotor cortex is an area of the brain located directly behind the prefrontal cortex that plays an important role in motor planning.…