Final answer:
The extensor carpi radialis longus and brevis are responsible for extending and abducting the hand at the wrist, whereas the flexor carpi ulnaris is involved in wrist flexion and adduction. These are extrinsic muscles originating in the forearm and inserting into the hand. Other muscles like the palmaris longus are also involved in wrist movement, but they have different roles.
Step-by-step explanation:
The tendons of the dorsal hand and wrist involve various muscles that facilitate movement. In the context of the dorsal view, the extensor carpi radialis longus and extensor carpi radialis brevis muscles are responsible for extending and abducting the hand at the wrist. These muscles are part of the superficial posterior compartment of the forearm. Muscles in the anterior compartment, like the flexor carpi ulnaris, produce flexion and adduction at the wrist.
The intrinsic muscles of the hand originate and insert within the hand itself, enabling fine motor functions. The extrinsic muscles, such as the extensor and flexor muscles mentioned, originate along the forearm and insert into the hand for broader movements.
For a quick clarification, the palmaris longus is a muscle that participates in wrist flexion, but there is no palmaris brevis in the context you're asking about; and the abductor pollicis refers to muscles involved in thumb movements, but they are not the primary extensors of the wrist and fingers.