+-----------------------------------------------------+------+ | Pineal Eyes. | | +-----------------------------------------------------+ | | Lateral Eyes. | Si. | +-----------------------------------------------------+ | | Olfactory Organ. | | +-----------------------------------------------------+------+ | Vertebrate (Ammocoetes or Cephalaspid). | | +-------------+---------------+-------------+---------+------+ | | Splanchnic | Somatic | Somatic | | | Appendages. | Nerves. | Segmental | Nerves. | | | | | Muscles. | | | +-------------+---------------+-------------+---------+ | | ... | ... | ... | ... | | +-------------+---------------+-------------+---------+ | | | | | | | | | V | Muscles | | | |4 tentacles | Tentacular | supplied by | III | | | and upper | and upper | oculomotor | | | | lip. | lip nerve. | nerve. | | | | | | | | | | | | | | | +-------------+---------------+-------------+---------+ | | Tongue | V | Sup.oblique | IV | Ii. | | | Tongue nerve | | | | +-------------+---------------+-------------+---------+ | | Lower lip | V | | | | | |Lower lip nerve| | | | +-------------+---------------+-------------+---------+ | | Thyroid |} | | | | +-------------+} VII | Ext. rectus | VI | | | Hyoid or |} |Retract oculi| | | |1st Branchial|} | | | | +-------------+---------------+-------------+---------+ | |2nd Branchial| IX | ... | ... | | +-------------+---------------+-------------+---------+------+