Final answer:
There are four dorsal interosseous muscles in the hand and seven in the foot, which aid in the abduction, flexion, and extension of fingers and toes respectively.
Step-by-step explanation:
Number of Dorsal Interosseous Muscles in the Foot and Hand
In the human body, the dorsal interosseous muscles are an integral part of the intrinsic muscles of the hand and foot. In the hand, there are four dorsal interosseous muscles. These muscles are located between the bones of the hand and function to abduct and flex the three middle fingers at the metacarpophalangeal joints and extend them at the interphalangeal joints. Unlike the hand, the foot contains seven dorsal interosseous muscles. These muscles are situated between the metatarsal bones and assist with the abduction and flexion of the toes.