| Three key transitions in the development of the hypostome are given and possible origins for the hypostome and tritocerebrum are indicated. |
| Mutation and overexpression of labial result in altered homeotic gene expression in the tritocerebrum. |
| The tritocerebrum is linked to subesophageal ganglion by circumesophageal connectives and to the frontal ganglion by frontal commisure. |
| In crustaceans, the deutocerebrum and tritocerebrum feed nerves into the primary and secondary antenna respectively. |
| The protocerebrum possesses optic centers and optic nerves, while the tritocerebrum contains the nerves which supply the chelicerae. |
