Parotid and Infratemporal Regions Flashcards Preview

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Flashcards in Parotid and Infratemporal Regions Deck (35):
1

Parotid Duct

Transversely passes over Masseter then through Buccinator
Opens into Oral Vestibule opposite 2nd maxillary molar tooth

2

Parotid Gland Innervation

Secretomotor Innervation
Parasympathetic innervation from CN IX
Sensory Innervation
- Great auricular nerve (cervical plexus)
- Auriculotemporal nerve (V3)

3

Parotid Gland Innervation - Parasympathetic

Preganglionic fibers emerge from foramen ovale from lesser petrosal nerve
Synapse at Otic Ganglion
Postganglionic fiber hitch ride from auriculotemporal nerve to arrive at parotid gland

4

Strucures within the Parotid Gland

Lymph nodes
Facial nerve and branches
External Carotid Artery
Retromandibular Vein
Great Auricular Nerve (C2,3)

5

Temporal Region

Temporal Fossa
Infratemporal Fossa

6

Temporal Region - Temporal Fossa Boundaries and Muscles

Posteriorly and Superiorly = Temporal lines
Anteriorly = Frontal and zygomatic bones
Laterally = Zygomatic arch
Inferiorly = Infratemporal crest
Muscles = Temporalis and Masseter

7

Temporal Region - Infratemporal Fossa Boundaries

Laterally = Ramus of mandible
Medially = lateral pterygoid plate of sphenoid
Anteriorly = posterior part of maxilla
Posteriorly = tympanic plate, mastoid and styloid process of temporal bone
Superiorly = inferior surface of the greater wing of the sphenoid bone
Inferiorly = medial pterygoid's attachment to the angle of the mandible

8

Temporal Region - Infratemporal Fossa Contents

1. Temporalis-Inferior part
2. Lateral and Medial pterygoids
3. Maxiallary artery and vein
4. Pterygoid venous plexus
5. Mandibular division of CN V and branches
6. Chorda tympani (CN VII)
7. Otic ganglion

9

Muscles of Mastication and Innervation

Innervated by V3
Temporalis
Masseter
Medial and Lateral Pterygoids

10

Maxillary Artery

Divided into three parts by the lateral pterygoid muscle
Arises posterior to the neck of mandible

11

Maxillary Artery - Selected Branches

1. Inferior Alveolar
2. Middle Meningeal
3. Deep Temporal (ant and post)
4. Infraorbital
5. Sphenopalatine
6. Descending Palatine

12

Maxillary Artery - Inferior Alveolar Branch

Enters the mandibular foramen
Supplies inferior teeth
Emerges out the mental foramen as mental artery

13

Maxillary Artery - Middle Meningial

Enters the foramen spinosum to supply the dura mater
Before it enters the foramen is surrounded by the auriculotemporal nerve

14

Maxillary Artery - Deep Temporal

Ascends deep to the tempoalis muscle

15

Maxillary Artery - Infraorbital

Enters inferior orbital fissure to enter the orbit
Runs in floor of orbit to emerge from infraorbital foramen

16

Maxillary Artery - Sphenopalatine

Enters the superior aspect of the pterygomaxiallary fissure, will enter the nasal cavity via the sphenopalatine foramen

17

Maxillary Artery - Descending Palatine

Descends in the palate canal within the pterygomaxillary fissure to the hard palate to branch into greater and lesser palatine arteries

18

Pterygoid Venous Plexus

Anastamoses with the cavernous sinus and maxillary vein

19

Trigeminal Nerve - Mandiular Division

Motor to 8 muscles MASTMATT (four muscles of mastication and mylohyoid, ant belly of digastric, tensor tympani, tensor veli palatini)
Emerges from cranial vault through foramen ovale
General Sensory Branches

20

Trigeminal Nerve - Mandibular Division - General Sensory Branches

Meningeal branch to dura mater
Buccal nerve (long buccal)
Lingual Nerve
Inferior Alveolar
Auriculotemporal Nerve

21

Trigeminal Nerve - Mandibular Division - General Sensory Branches - Buccal

General sensory to cheek

22

Trigeminal Nerve - Mandibular Division - General Sensory Branches - Lingual

General sensory to anterior 2/3 of tongue
Carried in nerve is Chorda Tympani

23

Trigeminal Nerve - Mandibular Division - General Sensory Branches - Inferior Alveolar

Enters the mandibular foramen
Gives off nerve to the mylohyoid, motor to mylohyoid and ant belly of digastric
Supplies mandibular teeth and emerges through mental foramen as the mental nerve

24

Trigeminal Nerve - Mandibular Division - General Sensory Branches - Auriculotemporal

Sensory to auricle, external auditory meatus, tympanic membrane, parotid gland, TMJ, scalp-anterior to the ear
Carries postganglionic parasympathetic fibers from otic ganglion to parotid ganglion

25

Chorda Tympani

- Leaves facial nerve posterior to middle ear cavity
- Runs deep to tympanic membrane over malleus
- Emerges from skull into infratemporal fossa and joins the lingual nerve
- Conveys taste from anterior 2/3 of tongue
- Conveys preganglionic parasymp to the submandibular and sublingual glands

26

Otic Ganglion

Postganglionic parasympathetic neurons to parotid gland
Just inferior to foramen ovale

27

Temporomandibule Joint

- Modified hinge joint

28

TMJ - Articular Surfaces

Head of Mandible
Articular tubercle and mandibular fossa

29

TMJ - Articular Disc

Divides joint into an upper cavity (gliding movements; protrusion and retrusion) and a lower cavity (hinge movements; opening and closing)

30

TMJ - Nerve Suply

Auriculotemporal Nerve
Masseteric Nerve

31

TMJ - Movements - Elevation

Close Mouth
Temporal
Masseter
Medial Pterygoid

32

TMJ - Movements - Depression

Open Mouth
Lateral Pterygoid
Suprahyoid
Infrahyoid
Gravity is main player though

33

TMJ - Movements - Protrusion

Lateral Pterygoig
Masseter with assistance from medial pterygoid

34

TMJ - Movements - Retrusion

Temporalis
Massester

35

TMJ - Movements - Lateral Movements

Glide and Chew
Temporalis of same side
Pterygoids of opposite side
Masseter