APhaFIG 4: Intact bacteria in the terminal bulb lumen of a 15-day-old adult.
Images from the terminal bulb region of a young adult (B) or 15-day-old adult (C).
A. Pharynx diagram with black line showing approximate position of regions shown in B&C.
B&C. In the terminal region of the pharynx, near the grinder, intact bacteria are observed in old adults, while in young adults only debris from chewed-up bacteria is seen. Note also that the lumen becomes distended as these intact bacteria accumulate.
(Image sources: B, N2T [N. Thomson] 339; C, N829 [D. Hall] W004.) Ch, pharyngeal channels; pm, pharyngeal muscle; mc, marginal cell; g1, g1 gland cell process. Bar, 1 micron.
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