Classification of Salivary Glands
All salivary glands (glandulae salivariae) are classified by size and location. They are traditionally divided into major salivary glands, which form large, independent anatomical structures, and minor salivary glands, which are integrated into the mucous membrane of various parts of the oral cavity. This division helps systematize knowledge regarding the topography, innervation pathways, and vascular supply of each organ.
Major Salivary Glands
This group comprises three pairs of large glands. Note the specific features of their location, vascular supply, and innervation outlined in core anatomical data.
Parotid Gland (glandula parotidea)
Structurally, it is a compound alveolar gland. It is located anteriorly and inferiorly to the auricle. Its main excretory duct, called the ductus parotideus, opens directly into the vestibule of the oral cavity.
- Innervation: Provided via the chorda tympani (branch of the facial nerve, n. facialis) with participation of the ganglion submandibulare, as well as sympathetic nerve fibers accompanying the facial artery (a. facialis).
- Blood supply: Supplied by the sublingual and submental arteries (aa. sublinguales, submentalis), branching from the a. facialis. Venous drainage occurs via the sublingual vein (v. sublingualis).
- Lymphatic drainage: Lymph from the gland is directed to the submandibular and submental lymph nodes (nodi lymphatici submandibulares et submentales). Occipital, parotid, submandibular, and deep cervical nodes (nodi lymphatici occipitales, parotidei, submandibulares et cervicales profundi) are also associated with the region.
Submandibular Gland (glandula submandibularis)
This gland features a mixed type of secretion and is localized in the submandibular fossa.
- Blood supply: Supplied by the glandular branches of the facial artery (rr. glandulares a. facialis), as well as the lingual and mental arteries (a. lingualis et a. mentalis). Venous blood drains via the facial vein (v. facialis).
- Lymphatic drainage: Lymphatic vessels drain into the nodi lymphatici submandibulares.
- Innervation: Similar to the parotid gland, it is innervated by the chorda tympani via the ganglion submandibulare and sympathetic nerves along the a. facialis.
Sublingual Gland (glandula sublingualis)
Topographically, this gland lies beneath the mucous membrane of the floor of the oral cavity. A distinctive feature is the presence of multiple small excretory ducts termed ductus sublinguales minores.
- Innervation: Provided by the parotid branches of the auriculotemporal nerve (rr. parotidei n. auriculotemporalis, a branch of n. mandibularis). Secretory fibers originate from the otic ganglion (ganglion oticum), while sympathetic nerves accompany the superficial temporal artery (a. temporalis superficialis).
- Blood supply: Provided by branches of the superficial temporal and maxillary arteries (rr. parotidei aa. temporales superficialis et maxillaris). Venous drainage proceeds via the retromandibular vein (v. retromandibularis).
- Lymphatic drainage: Directed to the submandibular nodes (nodi lymphatici submandibulares).
Minor Salivary Glands
In addition to the large paired organs, numerous minor salivary glands function within the oral cavity. They lack large isolated excretory ducts and lie within the thickness of the mucous membrane of various oral structures. Depending on their location, minor glands are divided into the following groups:
- Labial glands — glandulae labiales;
- Buccal glands — glandulae buccales;
- Lingual glands — glandulae linguales;
- Palatine glands — glandulae palatinae.
All these small glandular structures make an important contribution to the continuous moistening of the oral mucosa.