- The parotid gland is primarily responsible for secreting a serous, enzyme-rich fluid.
- This gland produces a watery secretion that is rich in digestive enzymes, particularly amylase, which initiates the breakdown of starches in the mouth.

- In contrast, the sublingual gland predominantly secretes a mucous fluid, which is thicker and helps lubricate the oral cavity.
- The submandibular gland produces a mixed serous and mucous secretion, but its serous component is not as dominant as that of the parotid gland.
- The minor salivary glands mainly secrete mucous to assist in lubricating specific areas of the mouth.

Therefore, the parotid gland’s primary secretion is serous and enzyme-rich,** making it essential for the initial enzymatic digestion of food.

Reference: Gray's Anatomy, 41st Edition, Head and Neck, Salivary Glands Chapter/Page 891-893