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.
Epidermal dendritic cell that functions as an antigen-presenting cell during an immune response. Arise from red bone marrow and migrate to the epidermis, where they constitute a small fraction of the epidermal cells. They participate in immune responses mounted against microbes that invade the skin, and are easily damaged by UV Light. Merkel Cells (help make 2%) Type of cell in the epidermis of hairless skin that makes contact with a merkel disc, which functions in touch. Located in the deepest layer of the epidermis, where they contact the flattened process of a sensory neuron called tactile disc.