Biology

Third Ventricle Definition Third ventricle is a median (midline) cavity in the brain and is bounded by the thalamus and hypothalamus on either side. It…

Retina Bipolar Cell Definition Retina bipolar cells are the first ‘projection neurons’ of the vertebrate visual system. As a part of the retina, bipolar cells…

Retinal Ganglion Cell Definition Retinal ganglion cells (RGCs) relay visual information from their cell soma located in the retina, through their axons which project along…

Optic Nerve Definition Optic nerve is either of the second pair of cranial nerves, which carry sensory information relating to vision from the retina of…

Lumbar Plexus Definition Lumbar plexus is a group of four nerves (L1, L2, L3 and L4) that are located in front of the hip joint…

Peripheral Nervous System Definition Peripheral nervous system (PNS) is the part of the nervous system in vertebrate animals that lies outside of the brain and…

Myelin Protein Zero Definition Myelin protein zero (PO, MPZ) is a glycoprotein which in humans is encoded by the MPZ gene. This gene is specifically…

Oligodendrocyte Definition Oligodendrocyte is any of the neuroglial cells of the central nervous system that are responsible for the formation of myelin sheaths in the…

Dendritic Spine Definition Dendritic spines are a preferential site of synaptic axodendritic contact; they are sparse or absent in some types of nerve cells (motor…

Purkinje Cell Definition Purkinje cell is a large, densely branching neuron in the cerebellar cortex of the brain. These cells were first discovered in 1837…

About Cerebellum Definition Cerebellum is the part of the vertebrate brain that is located below the cerebrum at the rear of the skull and that…

Medulla Oblongata Definition Medulla oblongata is the lowermost portion of the brainstem in humans and other mammals. It is important in the reflex control of…