Growth cone
（重定向自Growth cones）
A growth cone is a dynamic, actin-supported extension of a developing neurite seeking its synaptic target. Their existence was originally proposed by Spanish histologist Santiago Ramón y Cajal based upon stationary images he observed under the microscope. He first described the growth cone based on fixed cells as “a concentration of protoplasm of conical form, endowed with amoeboid movements” (Cajal, 1890). Neuronal growth cones are situated on the very tips of nerve cells on structures called axons and dendrites. The sensory, motor, integrative, and adaptive functions of growing axons and dendrites are all contained within this specialized structure.