Sales Training 2014 - Dentistry

Anatomy of Salivary Glands

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Posterior belly of digastric

Sternomastoid

Vertebra

Mastoid Facial nerve Lymph nodes Internal jugular vein Parotid External carotid artery

SECTION I

Styloid process

Po SS

Parapharyngeal space

RPS

Carotid sheath with vessels Fascia from styloid to tensor palati

Pr SS

PMS

Medial pterygoid

Subcutaneous tissue

Pterygomandibular space with inferior alveolar nerve and artery

Mandible Masseter Buccinator Parotid duct

Figure 7.4 Axial section of parotid gland. PMS, pharyngeal mucosal space; Po SS, post-styloid space; Pr SS, post-styloid space; RPS, retropharyngeal space.

Lobes of the Parotid Gland The gland has multiple projections called lobes (Fig. 7.5) which are named according to their location: 1. Glenoid lobe 2. Pterygoid lobe 3. Carotid lobe 4. Socia parotidis Parotid Duct (Ductus Parotideus) It is the excretory duct of the parotid gland measur- ing about 4–6 cm in length and 5 mm in diameter. It is also known as Stensen’s duct. It lies midway between the zygomatic arch and the corner of the mouth along a line between the upper lip philtrum

and the tragus (Fig. 7.3). The duct originates at the anterior border of the parotid and parallels the zygomatic arch, runs on the masseter, winds around the anterior margin of the masseter and opens lat- eral to the second upper molar tooth. Before it opens into the oral cavity, it pierces through the buccal fat pad, the buccopharyngeal fascia and the buccinator muscle. It runs obliquely through the buccinator which avoids inflation of the duct while blowing the mouth. The duct opens intraorally on the inner sur- face of the cheek. A small mucosal elevation called parotid papilla ( papilla ductus parotidei ) identifies this opening. The diameter of the parotid duct is smaller at the opening when compared with the di- ameter elsewhere in the duct.

Accessory parotid

External acoustic meatus Glenoid lobe

Parotid duct

Pterygoid lobe

Parotid Carotid lobe Sternomastoid

Masseter

External carotid artery

Digastric

Figure 7.5 Lobes of parotid.

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