In 1821, he described in the trajectory of the facial nerve and a disease, Bell's Palsy which led to the unilateral paralysis of facial muscles, in one of the classics of neurology, a paper delivered to the Royal Society entitled On the Nerves: Giving an Account of some Experiments on Their Structure and Functions, Which Lead to a New Arrangement of the System.
En 1821 describiu a traxectoria do nervio facial e unha enfermidade que levaba a unha parálise unilateral dos músculos faciais en On the Nerves: Giving an Account of some Experiments on Their Structure an Functions, Which Lead to a New Arrangement of the System.