Final answer:
In human anatomy, 'distal' describes a part of the body that is farther from the point of attachment or the trunk of the body, such as the head of the ulna or the crus related to the femur.
Step-by-step explanation:
The term distal in human anatomy refers to a part of the body that is farther away from the point of attachment to the trunk of the body or the proximal end. For example, the crus (the leg portion below the knee) is considered distal compared to the femur (the thigh bone). Going further, the head of the ulna, which forms the distal end of this forearm bone, is an example of a distal structure in comparison to the points closer to the body's center.
During embryonic development, the distal ends of the limb buds will form the hands and feet. These parts will further differentiate and develop into detailed structures such as the fingers and toes, creating the complex anatomy of the limbs.