First Ray is a term often used in anatomy to refer to the first digit of the hand or foot, commonly known as the thumb in the hand and the big toe in the foot. This digit plays a crucial role in grasping and balance, making it essential for various daily activities. In the context of anatomy, the First Ray consists of the first metatarsal bone and its associated phalanges in the foot. It is significant for walking and running, as it helps in maintaining stability and propulsion during movement. Proper function of the First Ray is vital for overall mobility.