endocrine portions. Serous gland a gland that secretes a watery albuminous material, commonly but not always containing enzymes. Salivary glands glands of the oral cavity whose combined secretion constitutes the saliva, including the parotid, sublingual, and submandibular glands and numerous small glands in the tongue, lips, cheeks, and palate. Olfactory glands small mucous glands in the olfactory mucosa. The ordinary or eccrine sweat glands are distributed over most of the body surface, and promote cooling by evaporation of the secretion; the apocrine sweat glands empty into the upper portion of a hair follicle instead of directly onto the skin, and are found only. Vulvovaginal g's Bartholin's glands. The lymph nodes of the neck. Its secreting tubules and acini are long and branched, and it is enclosed in a sheath, the parotid fascia.