This section is from the book "Handbook Of Anatomy For Students Of Massage", by Margaret E. Bjorkegren. Also available from Amazon: Handbook Of Anatomy For Students Of Massage.
The Submaxillary Gland is the next largest; it lies in a recess just inside the angle of the mandible. It lies on the mylohyoid muscle and posteriorly is in contact with the sterno-mastoid muscle.
The duct (Wharton's) leaves the deep surface of the gland and passing forwards beneath the mylohyoid muscle pierces the floor of the mouth under the tongue.
The Sublingual Gland is a small gland which lies on the floor of the mouth under the tongue, covered only by mucous membrane.

Fig. 48. - The Salivary Glands.
The ducts (of Rivini) are numerous and small, and pierce the mucous membrane covering the gland.
 
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