Temporomandibular joint

Question 1

Surface projection of head of mandible

Answer 1

• Expanded, apical end of mandibular condyle

* Articulates with mandibular fossa (temporal bone) to form temporomandibular joint (TMJ)

Question 2

Surface projection of zygomatic arch

Answer 2

Description:
• Bony arch formed by zygomatic bone (temporal process) and temporal bone (zygomatic process)
• Palpable and visible where cheek and temple meet

Question 3

Parotid gland

Answer 3

• Pyramidal-shaped salivary gland with dense capsule
• Connected with vestibule of oral cavity by parotid duct
• Produces and secretes components of saliva
• Produces 25-30% of saliva
• Serous secretions only

Question 4

Facial n. (CN VII)

Answer 4

Motor:
• Muscles of facial expression
• Posterior belly of digastric muscle
• Stylohyoid muscle
• Stapedius muscle

General sensation:
• Small area of skin of auricle of ear

Special sensation:
• Taste from anterior 2/3 of tongue
• Taste from palate

Parasympathetic:
• Lacrimal gland
• Submandibular and sublingual salivary glands
• Mucous glands of nasal cavity, paranasal sinuses, and palate

Question 5

Temporalis m.

Answer 5

Action:
• Elevation of mandible (e.g., closing mouth)
• Retraction of mandible
nnervation:
• Trigeminal nerve (mandibular division - CN V3)

Question 6

Zygomatic arch

Answer 6

Description:
• Bony arch formed by zygomatic bone (temporal process) and temporal bone (zygomatic process)
• Posterior and inferior to lateral margin of orbit
• Palpable where cheek and temple meet
• Provides attachment for masseter muscle

Question 7

Masseter m.

Answer 7

• Elevation of mandible (e.g., closing mouth)
• Protraction of mandible
• Trigeminal nerve (mandibular division - CN V3)

Question 8

Articular disc of temporomandibular joint

Answer 8

Biconcave fibrocartilage disc

Comment:
• Attached to lateral pterygoid muscle
• Disruption of disc-TMJ relationship causes “jaw clicking”
Location:
• Temporomandibular joint, between head of mandible and mandibular fossa of temporal bone

Question 9

Ramus of mandible

Answer 9

Location:
• Mandible (lower jaw)

Description:
• Vertical part of mandible

Comment:
• Provides attachment for temporalis, masseter, and medial pterygoid muscles

Question 10

Head of mandible

Answer 10

Description:
• Expanded, apical end of mandibular condyle
• Articulates with mandibular fossa (temporal bone) to form temporomandibular joint (TMJ)

Function:
• Contributes to temporomandibular joint (TMJ)