Final answer:
The hand zones related to tensor tendons are governed by the flexor retinaculum and extensor retinaculum, which are connective tissue bands sheathing the tendons, and the carpal tunnel, where these tendons and an important nerve pass to enter the hand. Problems such as carpal tunnel syndrome can occur when these tendons are compressed, leading to pain, numbness, or muscle weakness.
Step-by-step explanation:
The forearm muscles are connected to the hand through tendons. At the wrist, these tendons are sheathed by fibrous bands known as retinacula. Specifically, the flexor retinaculum and extensor retinaculum are critical structures. The flexor retinaculum covers the palmar side and extends over to the carpal tunnel, creating a passageway for the muscle tendons and an important nerve to pass through. The tendon zones of the hand are regulated by these structures, ensuring the proper movement and function of the hand.
Furthermore, the carpal bones and flexor retinaculum enclose the carpal tunnel, the entry point for several tendons from the muscles of the anterior forearm. Issues such as carpal tunnel syndrome can arise when these tendons or the nerves housed within the carpal tunnel are compressed, often due to repetitive use or injury.
The intrinsic muscles within the hand synergize with the tendons extending into the hand from the forearm, enabling fine motor control. The coordination of these structures is essential for the hand to perform a wide range of functions.