Final answer:
The muscles of the deep compartment of the posterior forearm include the abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus, extensor indicis, and their associated blood vessels and nerves. These muscles are responsible for extending and abducting the thumb, as well as extending the index finger.
Step-by-step explanation:
The muscles of the deep compartment of the posterior forearm include the abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus, extensor indicis, and their associated blood vessels and nerves. These muscles are responsible for extending and abducting the thumb, as well as extending the index finger.