R e lations Upper Part 1.S uperficial Temporal ves s els . A uriculotemporal nerve. 2.C artilaginous part of E xternal A uditory Meatus . 3.Temporal branc h of Facial n.
R e lations Lower Part 1.C ervical branch of Facial n. 2.Retromandibular vein. 3.Pos terior belly of digas tric. 4.E xternal C arotid artery.
R e lations A nterior B order• Zygomatic branch of Facial n.• Transverse Facial artery.• Buccal branch of Facial n.• Accessory Parotid gland.• Parotid duct.• Mandibular branch of Facial n.
R e lations Lateral S urface 1.Great Auricular nerve. 3.Parotid lymph nodes. 4.Skin and Fascia
R e lationsA ntero-Medial S urface • Ramus of the mandible. • Masseter muscle. • Medial pterygoid muscle
R e lationsPos tero-Medial S urface 1. Mastoid process 2. Sternomastoid muscle 3. Posterior belly of Digastric 4. Styloid process and the muscle & ligaments attached to it. 5. Internal carotid artery & Internal jugular vein (carotid sheath).
R e lationsS tructures within the G land • External carotid artery • Retromandibular vein • Facial nerve
A cces ory Part Semidetached part of the gland, which lies just above the parotid duct
Parotid Duct 5 cm long & emerges from the anterior border & runs superficial to masseter m.
Parotid Duct Then pierces the buccinator to open in the vestibule of mouth, opposite the upper 2nd molar tooth
A rterial S upplyExternal Carotid Artery Venous DrainageRetromandibular Vein
Nerve S upply 1. Sensory: a. Gland: Auriculotemporal nerve a. Capsule: Great Auricular nerve
Nerve S upply 2. Sympathetic: From the sympathetic plexus around .the external carotid
Nerve S upply 3. Parasympathetic:The secretomotor fibers arise from the inferior salivary nucleus in the medullaoblongata.Joins the glossopharyngeal nerve (9th cranial)Leaves the 9th nerve through its tympanic branch which enters the middle ear whereit joins the tympanic plexus.Lesser Petrosal nerve arises from the tympanic plexus as a continuation of thetympanic branch Otic MedullaEnters the foramen ovale to relay in Ganglion Oblangatathe otic ganglion .Auriculotemporal nJoins auriculotemporal nerve through which they reach the gland Inferior Lesser Salivary Nucleus Petrosal n. Tympanic Plexus .Glossopharyngeal n
S urface A natomy of Parotid G land Head of Mandible Middle of Mastoid Masseter m. Process 2 cm below Angle of Mandible
S urface A natomy of Parotid Duct Tragus of the ear Middle ⅓ of the horizontal line Midway between the ala of the nose and the angle of the mouth
S ite Digastric triangle, partly below & partlydeep to the mandible
P arts 1. Superficial part 2. Deep part 3. Submandibular duct Submandibular duct Deep part Superficial part
S u p e rficial P art Wedge shaped, extending:Posteriorly: to the angle of mandible.Superiorly: to mylohyoid line of mandible.Inferiorly: it overlaps the 2 bellies of digastric m
R e lations• Inferolateral surface: related to skin, superficial fascia (containing platysma, cervical branch of facial n., ant. facial v., LNs) & deep fascia.• Lateral surface: related to body of mandible, facial a., mylohyoid n. & a.• Medial surface: related to 2 muscles (mylohyoid & hyoglossus) & 2 nerves (lingual & hypoglossal).
Triple Relations of Facial Artery to the Gland .Facial a
Triple Relations of Lingual Nerve to the Duct .Lingual n .Hypoglossal n
D e e p P artSmall part lying deep to mylohyoidSuperficial to hyoglossusBetween lingual n. above & hypoglossal n. below .Lingual n Mylohyoid
S u b m and ib u lar D u ct5cm longTriple relations with the lingual nerve .Lingual n
S u b m and ib u lar D u ct5cm longTriple relations with the lingual nerveOpening into the floor of mouth close to frenulum of the tongue Frenulum
N e rve S u p p ly • Sensory: Lingual nerve • Sympathetic: Plexus around the facial artery • Parasympathetic: Chorda tympani from Facial nerve