Motor signs: slight weakness of dorsiflexion of the foot and extension of the big toe at the metatarsophalangeal joint may occur. The extensor hallucis longus seems especially vulnerable to loss of the function of this root. There may also be a little weakness of eversion.
Sensory signs: blunting of the sensation may be found extending down the antero-lateral aspect of the shin across the dorsum of the foot to the hallux beyond the first metatarso-phalangeal joint; also the sole of the foot.
Reflex jerks: neither the knee or the ankle jerk are affected.
Last reviewed 01/2018