Basalis

Basalis is a Latin term meaning "of the base" or "at the base," and it is used across biology to denote a basal or foundational part of an organ or structure. The term appears in several branches of science with the common sense of position at the base or proximal side of a feature.

In human anatomy and histology, the stratum basale (germinativum) is the deepest layer of the epidermis from which keratinocytes originate; it sits atop the dermis and contains stem cells and melanocytes. In the endometrium, the stratum basale is the basilar layer that remains after menstruation and serves to regenerate the functional layer (stratum functionalis) in the next cycle.

In neuroscience, the nucleus basalis (basalis nucleus) of Meynert refers to a group of cholinergic neurons in the basal forebrain. This network modulates cortical activity and memory, and its degeneration is associated with Alzheimer's disease.

In embryology, the basal plate is the ventral portion of the neural tube that gives rise to motor neurons; the dorsal portion is the alar plate. The term is sometimes discussed in its Latinized form basalis in older texts.

In botany and plant morphology, basalis is used to describe parts located at the base of a plant or organ, such as basal leaves or basal meristems, distinguishing them from apical or distal regions.