Pharynx Atlas Home

The pictures that comprise the Pharynx Atlas are a focal series through the terminal bulb of the pharynx. The worm is lying on its right side, with anterior towards the upper left and posterior towards the lower right. Dorsal is the upper right and ventral is the lower left.
This is the sixth image in the series. Earlier images start at the leftmost edge of the pharynx and subsequent images go consecutively deeper, until the last goes through the very rightmost edge. The focal planes are not equally spaced. They were chosen so that all the nuclei in the terminal bulb would be clearly visible in at least one image.

Click on individual pharyngeal cells to identify them.

Pharyngeal Sensory Neuron I4

Description: I4 is a pharyngeal interneuron of unknown function. Its cell body is in the dorsal anterior terminal bulb. Its processes extend through subventral isthmus to the pharyngeal nerve ring in the metacorpus. (See Pharynx section; Albertson and Thomson, 1975; I4 neuron page.)

Pharynx Focal Plane 4
I4 mc2DR

Identification: I4 is a medium-sized neuronal nucleus. It is on the dorsal midline, immediately anterior to pm7D, a big fried-egg nucleus. The line of three cells pm6D (also a big fried-egg), pm7D, and I4 extending from posterior to anterior along the dorsal midline of the terminal bulb is easy to recognize.