Moreover, the differences in enervation of these patches suggest that the osphradium (as a patch enervated from the ctenidial nerve) may be different from another organ sometimes called the posterior sensory organ (PSO) with separate enervation from the  lateral nerve cords. Both types of sensory organs are found in the nautilus.
The differences in degeneration of these patches suggest that the osphradium, which is a patch derived from the ctenidial nerve, may be distinct from another organ sometimes called the posterior sensory organ (PSO), which has its own separate enervation from the lateral nerve cords. Both types of sensory organs are present in the nautilus.