Zill - Parotid

Question 1

Temporal Fossa Contents?

Answer 1

Superficial Temporal Artery

Auriculo-Temporal Nerve (V3)

Question 2

Infratemporal Fossa Clinically Relevant Contents?

Answer 2

Maxillary Artery

Source of blood supply to nasal cavity, calvarium, oral cavity, middle ear; location of muscles of mastication

Question 3

What is a clinical outcome of the maxillary artery’s location?

Answer 3

Can not ligate, bleeding (nosebleed = epistaxis) treated by cauterization of branches

Question 4

Maxillary Artery - Part 1

(Most Posterior)

Answer 4

1. Deep Auricular
2. Anterior Tympanic
3. Middle Meningeal
4. Accessory meningeal (Foramen Ovale)

5. Inferior Alveolar (diving into bone w/nerve)

Question 5

Clinical: Damage to Middle Meningeal

Answer 5

Epidural Hematoma

Uncal Herniation - Push temporal lobe through tentorial notch

Tonsillar Herniation - Push Cerebellum (tonsil) through foramen magnum

Question 6

Maxillary Artery - Part 2

(Mostly Muscles)

Answer 6

1. Deep Temporal Artery
2. Pterygoid Artery
3. Masseteric Artery
4. Buccal Artery

Question 7

Maxillary Artery - Part 3

(Through Foramina)

Answer 7

1. Posterior Superior Alveolar
2. Descending Palatine
3. Artery of Pterygoid Canal
4. Sphenopalatine
5. Infraorbital

Question 8

Clinical: Pterygoid Venous Plexus

Answer 8

Anastomose with Cavernous Sinus and Facial Vein

Can contribute to spread of infection from teeth, nasal cavity, palate to brain

Question 9

What portion of the TMJ can cause issues with lock-jaw?

How does the joint move?

Answer 9

Articular Tubercle (anterior to joint)

Temporo-mandibular (Lateral) Ligament

Upper compartment = Sliding

Lower compartment = Hinge

Question 10

Innervation for muscles of mastication?

What is the major role of these muscles?

Answer 10

All Branchiomotor V3

Most close mouth to chew food, need less to open mouth

Question 11

Role of Lateral Pterygoid?

How is this muscle clinically relevant in TMJ?

Answer 11

Pulls disc anteriorly when open mouth

The muscle can cause the jaw to become stuck on the Articular Tubercle

Question 12

Action for Lateral and Medial Pterygoid?

Action for Temporals and Masseter?

Answer 12

Pull jaw toward opposite side

Pull jaw toward same side

Question 13

Clinical: Symptom observed in jaw with Trigeminal Nerve damage?

Answer 13

Jaw deviates TOWARD paralyzed side due to unopposed action of Lateral Pterygoid muscle of intact side

Question 14

Innervation of Parotid?

Clinical issues with Parotid?

Answer 14

Parasymp (Visceral Motor) of CN IX (Glossopharyngeal)

Clinical: Viral infection of parotid, swelling painful, referred pain to ear from compression of Auriculo-Temporal Nerve