Final answer:
The arrow labeled A points to the external auditory meatus (EAM).
Step-by-step explanation:
The external auditory meatus (EAM), or the ear canal, is the large opening on the lateral side of the skull associated with the ear. It is the passage through which sound waves travel before hitting the eardrum (tympanic membrane). The arrow labeled A points to the external auditory meatus (EAM).