GENERAL HISTOLOGY

Detailed explanation-1: -Cephalopods have the most complicated nervous system found in the invertebrates. Octopi, squids, and cuttlefish are considered the most intelligent of all invertebrates. They are capable of some forms of learning, and some species exhibit elaborate social interactions.

Detailed explanation-2: -Cephalopods are also the most advanced of all mollusks, having the most intelligence of any mollusk. They also have the largest brains of all the invertebrates. Cephalopod shells can be a variety of shapes.

Detailed explanation-3: -Molluscs have six pairs of ganglia. The cerebral, pedal and pleural ganglia are the three pairs of ganglia that make up the central nervous system. Likewise, the visceral, buccal and parietal are the three pairs of ganglia that make up the peripheral nervous system.

Detailed explanation-4: -Cephalopods have large, well-developed brains, and their brain-to-body mass ratio is the largest among the invertebrates, falling between that of endothermic and ectothermic vertebrates. The nervous system of cephalopods is the most complex of all invertebrates.