An embryonic structure positioned halfway between the prospective eye and ear, adjacent to the future midbrain-hindbrain boundary. The profundal and the trigeminal ganglia are separate distally but fused at their proximal end as they condense around NF stage 24.
Synonyms:
exact_synonym:
ophthalmic lobe of trigeminal placode; ophthalmic lobe of trigeminal placode complex; ophthalmic placode; profundus placode