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 third image in the series. Earlier images start at the leftmost edge of the pharynx and 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 Motor Neuron I6

Description: I6 is a pharyngeal sensory neuron of unknown function. Its cell body is in the left subdorsal anterior terminal bulb. It is bipolar, one process running posterior then anterior in the terminal bulb to end at a putative sensory ending, the other extending anterior through dorsal isthmus to end at the pharyngeal nerve ring, without extending into the ring. (See Pharynx section; Albertson and Thomson, 1975; I6 neuron page.)

Identification: I6 is a medium-size neuronal nucleus in the left subdorsal anterior terminal bulb. It is just dorsal and posterior to pm5L, a big fried egg, and is straight anterior of M5, which is in posterior dorsal terminal bulb. pm5L, I6, M5, and mc2DL (another fried egg just posterior and ventral of M5, and straight posterior of pm5L) form an easily recognized trapezoid.