In planarians, there are two cords that carry messages to one of these bodies at the animal's head.
In planarians, there are two cords that carry messages to one of these bodies at the animal's head. In Arthrpods, one of them largely controls each segment of the body. Derived from cells of the neural crest where the fold continues into the ectoderm they are encased by the neurolemma cells. The dorsal root one contains a grouping of afferent neurons while the ventral root one contains efferent neurons. FTP, identify this type of organ, a collection of nerve cells lying outside the brain or central nervous system.
In planarians, there are two cords that carry messages to one of these bodies at the animal's head.
{ganglion}