Nervous System of Branchiostoma (With Diagram) | Chordata | Zoology
In Branchiostoma, nervous system is simple, having no brain as found in higher chordates. Nerve Cord: There is a mid-dorsal, hollow, tubular neural tube or nerve cord lying above the notochord. It starts behind the anterior end of the notochord and tapers to a point posteriorly and ends a short way in front of the hinder end of the notochord. [...]