TMJ

Question 1

1. What are the posterior attachments of the articular disc? What are the collagen rich parts?

Answer 1

Superior retrodiscal laminae ELASTIC

Inferior retrodical laminae (Collagen)

Question 2

2. What is the normal range of interinsical opening?

Answer 2

Average is 50mm. Minimum needed is 18mm

Question 3

3. What are the 4 muscles of mastication and what are their innervations?

Answer 3

Masseter: Branch of the mandibular nerve, a division of cranial nerve V
Temporalis: Branch of the mandibular nerve, a division of cranial nerve V
Medial pterygoid: Branch of the mandibular nerve, a division of cranial nerve V
Lateral pterygoid: Branch of the mandibular nerve, a division of cranial nerve V

Question 4

4. List the suprahyoid muscles and include their innervations

Answer 4

Digastric (posterior belly)

Facial nerve (cranial nerve VII)

Digastric (anterior belly)

Inferior alveolar nerve (branch of the mandibular nerve, a division of cranial nerve V)

Geniohyoid

C1 via the hypoglossal nerve (cranial nerve XII)

Mylohyoid

Inferior alveolar nerve (branch of the mandibular nerve, a division of cranial nerve V)

Stylohyoid

Facial nerve (cranial nerve VII)

Question 5

5. List the infrahyoid muscles and include their innervations

Answer 5

Omohyoid

Ventral rami of C1-C3

Sternohyoid

Ventral rami of C1-C3

Sternothyroid

Ventral rami of C1-C3

Thyrohyoid

Ventral rami of C1 (via cranial nerve XII)

Question 6

6. what muscles make up the mandibular sling?

Answer 6

Masseter and medial pterygoid