In order to understand contemporary psychology, it is important to look back at the origins and influences on this science. Courses on the history of psychology generally begin with the subject's ancient philosophical origins and explore the contributions of major thinkers up through the modern-day.
Spinous cells, or prickle cells, are keratin producing epidermal cells owing their prickly appearance to their numerous intracellular connections. They make up the stratum spinosum (prickly layer) of the epidermis and provide a continuous net-like layer of protection for underlying tissue.hey are pushed upward into the stratum spinosum by the continuous formation of new cells in the basal layer. They reach the outmost layer of the skin as flattened dead flaking skin cells we shed daily. The journey from origin to shed takes 25 to 45 days.
The epithelial cells that line capillaries are routinely referred to as endothelial cells, and the capillary epithelium is called an Endothelium-a term reserved for the layer of flat cells lining blood vessels, lymph vessels, and other cavities.he epithelial cells that line capillaries are routinely referred to as endothelial cells, and the capillary epithelium is called an Endothelium-a term reserved for the layer of flat cells lining blood vessels, lymph vessels, and other cavities.