Biology

Allocortex Definition Allocortex is a part of the cerebral cortex characterized by fewer cell layers than the neocortex, which is also known as heterogenetic cortex.…

Neocortex Definition Neocortex is the largest and evolutionarily most recent portion of the cerebral cortex, composed of complex, layered tissue, the site of most of…

White Matter Definition White matter is the whitish tissue of the vertebrate brain and spinal cord, made up chiefly of nerve fibers (axons) covered in…

Grey Matter Definition Grey matter is the greyish tissue of the brain and spinal cord, containing nerve cell bodies, dendrites, and bare (unmyelinated) axons Technical…

Nervous Tissue Definition Nervous tissue is a highly differentiated tissue composed of nerve cells, nerve fibers, dendrites, and neuroglia. It is composed of neurons, or…

Cerebral Cortex Definition Cerebral Cortex is the layer of gray matter in vertebrates that covers the cerebral hemispheres and is composed of folds of neurons…

Gyrus Definition Gyrus is a rounded ridge, as on the surfaces of the cerebral hemispheres. It is a convolution on the surface of a cerebral…

Orbitofrontal Cortex Definition Orbitofrontal Cortex (OFC) is a structure in which multiple sensory information and reward information converge. It is a prefrontal cortex region in…

Pineal Gland Definition Pineal Gland is a small gland located near the brain and primarily involved in the production and secretion of the hormone melatonin,…

Nasal Cavity Definition Nasal cavity the cavity on either side of the nasal septum, extending from the nares to the pharynx, and lying between the…

Pheromone Definition Pheromone is a chemical secreted by an animal that influences the behavior or development of other members of the same species. Queen bees,…

Chemoreceptor Definition Chemoreceptor is a sensory nerve cell or sense organ, as of smell or taste that responds to chemical stimuli. It is usually refers…