what two nerves is the sciatic nerve composed of

What structure can be found in the dorsal (posterior) root of a spinal nerve, but not the ventral (anterior) root of a spinal nerve

API John was struck in the left side of his face with a baseball while batting.  He was not wearing a helmet and he fractured his zygomatic arch and parts of his temporal bone.  After he had reconstructive surgery he noticed his left lower eyelid was still drooping and the corner of his mouth was sagging.  What nerve was damaged and what other issues could damage to this nerve cause?

Sciatic nerve is the largest branch of the lumbar plexus. T/F

Radial nerve (easily viewed in the proximal posterior arm between long and lateral heads of triceps brachii)   The radial nerve innervates the: brachioradialis, extensor carpi radialis longus and brevis, extensor carpi ulnaris, extensor digitorum, extensor digiti minimi, abductor pollicis longus, extensor pollicis longus and brevis, and extensor indicis. What is the name of the muscle compartment that houses most of these muscles? ____________________.