The submaxillary gland lies under the integument and fascia in the triangle formed by the lower jaw and the two bellies of the Digastric muscle.
"Manual of Surgery Volume Second: Extremities--Head--Neck. Sixth Edition."
Alexander Miles Alexis Thomson
Not only look at the pictures in Gray, Morris, Gerrish, or some finely illustrated work on anatomy, but we must apply a searching hand and know to a certainty that the constrictors of neck, or other muscles or ligaments do not pull cervical and hyoid bones so close as to bruise pneumogastric or any other nerves or fibres that would cause spasmodic contraction of Digastric, stylo-hyoid or the whole remaining group of neck muscles and ligaments, with which you are or should be very familiar.
"Philosophy of Osteopathy"
Andrew T. Still