Final answer:
In anatomical position, the fourth finger is medial to the first finger (thumb). The thumb is considered lateral in this standard body position, and each finger contains phalanx bones which assist in grasping.
Step-by-step explanation:
In the anatomical position, the fourth finger is medial to the first finger, which is also known as the thumb or pollex. When standing in anatomical position, the body is upright, palms facing forward, and the thumb is lateral to the other fingers. Each digit of the hand is numbered 1 through 5, starting with the thumb. Therefore, the fourth finger, or ring finger, is closer to the midline of the body, compared to the first finger (thumb), which is on the outside, making it medial.
The fingers contain phalanx bones (proximal, middle, and distal phalanges), and during movements such as gripping, the metacarpal bones aid in facilitating precision grasp.