Atlas of Human Anatomy by Netter

Sympathetic fibers from external carotid plexus from cervical ganglia
Submandibular gland
Lies superior and inferior to posterior half of mandible
Divided into superficial and deep parts by mylohyoid muscle
Duct
Opens at sublingual papilla, one on either side of lingual frenulum
Lingual nerve loops under duct
Arterial supply: submental artery
Innervation
Secretomotor parasympathetic fibers
a. Presynaptic fibers from facial nerve via chorda tympani to submandibular ganglion
b. Postsynaptic fibers from cells in submandibular ganglion
Vasoconstrictive sympathetic fibers from superior cervical ganglion
Sublingual glands
Smallest and deepest of glands
Lie in floor of mouth within sublingual folds, between mandible and genioglossus muscle
Numerous ducts open along sublingual folds
Arterial supply
Sublingual artery from lingual artery
Submental artery from facial artery
Innervation same as that for submandibular gland