Head and neck spaces

Question 1

Boundaries temporal fossa

Answer 1

Superior and posterior - superior temporal line

Roof - temporal fascia

floor - formed by 4 bones that form the pterion: sphenoid greater wing, parietal, frontal, temporal

Inferiorly - infratemporal crest

Lateral - zygomatic arch

Question 2

Boundaries infratemporal fossa

Answer 2

Lateral - mandibular ramus

Medially - lateral pterygoid plate and wall of nasopharynx

Anterior - posterior aspect of maxilla

Posterior - tympanic plate, mastoid and styloid processes of temporal bone

Superior - infratemporal surface of the greater ala of sphenoid

Inferior - medial pterygoid muscle attaches to mandible near angle (doesn’t really have a floor, but generally the plane created by the lower border of the mandible)

Question 3

Infratemporal fossa - contents

• Nerves-exit from SB (1) and main branches
• Muscles (90% of volume) (1)
• Vasculature - main artery and what it supplies and course

Answer 3

Nerves:

1. Foramen ovale –> mandibular nerve
   
   1. inferior alveolar nerve
   2. lingual nerve
2. buccal
3. chorda tympani
4. otic ganglion

Vasculature

• maxillary artery - from ECA, on medial surface of ITF, into a fissure formed by (lateral pterygoid plate and maxilla) = pterygomaxillary fissure
• supplies nearly all structures of the face (teeth etc.)

Muscles

1. medial pterygoid

http://www.youtube.com/watch?v=g2It4n1vr_U

Question 4

Buccal space contents

Answer 4

1. Buccal fat pad
2. Stensen’s duct
3. transverse facial artery and vein
4. anterior facial artery and vein
5. minor salivary glands
6. Lymph nodes, lymphatic channels
7. Accessory parotid gland
8. Facial nerve, branches of V3
9. Muscles (buccinator, masseter, facial expression)
10. Skin

Question 5

Layers of the cheek (deep to superficial)

Answer 5

Mucosa

Buccinator

Buccal space/Buccal fat pad

Facial muscles

Superficial layer deep cervical fascia

Skin

**of note: boundaries

• anterior - orbicularis oris
• posterior - masseter, mandible, pterygoid muscles, parotid