Which of the following is NOT a gland of the salivary glands?

The thyroid gland is indeed not a salivary gland. Salivary glands are responsible for producing saliva, which aids in digestion and oral health. The parotid, submandibular, and sublingual glands are all categorized as salivary glands, each serving specific functions in saliva production.

The parotid gland is the largest and is located near the ear, contributing to the secretion of saliva that contains enzymes to aid in digestion. The submandibular gland is found under the jaw and produces both serous fluid and mucus, while the sublingual gland, located underneath the tongue, primarily secretes mucus. In contrast, the thyroid gland plays a crucial role in metabolism and endocrine regulation by producing hormones such as thyroxine and triiodothyronine, but it does not produce saliva. Thus, the identification of the thyroid gland as not being a salivary gland is correct.