There is only one ciliated groove, the sulcus, in the stomodaeum.
These grooves are known as the sulcus and sulculus, and will be more particularly described hereafter.
Median line with a sulcus on each side; central area quadrate.
The sulcus is bifurcate; the fork is near the base and almost gives the appearance of two sulci on some specimens.
A muscular ridge, called the crista terminalis, corresponding to the sulcus terminalis on the exterior.
sulcus longitudinalis in superiore latere perforatus serie punctorum.
Each zooid has six tentacles; the stomodaeum is elongate, but the sulcus and sulculus are very feebly represented.
The sulcus is a deep groove between heavy folds proximally and is a shallower furrow distally (Figure 4).
It is then carried across the sulcus and is made to emerge through the opposite lip of the cervix.
plural sulci, Latin, literally "furrow, trench, ditch, wrinkle."
sulcus sul·cus (sŭl'kəs)
n. pl. sul·ci (-kī, -sī)
Any of the grooves on the brain surface, bounding the gyri; a fissure.
A long narrow groove or depression, as in an organ or a tissue.