Dynamic receptors of the TMJ joint:

 # Which of the following are dynamic receptors of the TMJ joint?

A. Ruffini endings

B. Pacinian corpuscles

C. Golgi tendon

D. Free nerve endings

The correct answer is B. Pacinian corpuscles

Pacinian corpuscles  are dynamic mechanoreceptors which accelerate movement during reflexes. 

The receptors for specific mechanics of proprioception:

Ruffini endings- static  mechanoreceptors which position the mandible

Pacinian corpuscles- Dynamic mechanoreceptors which accelerate movement during reflexes

Golgi tendon organs- Static mechanoreceptors for protection of ligaments around the temporomandibular joint

Free nerve endings- Pain receptors for protection of the temporomandibular joint itself

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Articular disc of TMJ is

 # Articular disc of TMJ is:

A. Fibrocartilaginous

B. Bony

C. Hyaline cartilage

D. Elastic cartilage

The correct answer is A. Fibrocartilaginous

The unique feature of the TMJ is the articular disc. The disc is composed of fibrocartilaginous tissue which is positioned between the two bones that form the joint. There is neither innervation nor vascularization within the central portion of the articular disc. Articular disc is oval fibrous plate with concavoconvex superior surface and concave inferior surface. It divides joint into upper and lower compartments. Upper compartment permits gliding and lower permits gliding as well as rotatory movements. 

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Sublingual salivary gland is located:

 # Sublingual salivary gland is located superior to:

A. Genioglossus

B. Hyoglossus

C. Mylohyoid

D. None of the above

The correct answer is C. Mylohyoid.

Sublingual salivary gland lies superior to mylohyoid and lateral to the genioglossus muscle. Its duct opens directly into floor of mouth on the summit of sublingual fold.

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Opening of submandibular gland duct:

 # The opening of submandibular gland duct into oral cavity is at:

A. Maxillary Second molar

B. Mandibular third molar

C. Dorsum of tongue

D. Sublinugual caruncle

The correct answer is D. Sublingual caruncle.

Submandibular duct or Warthin's duct is 5 cm long, emerges from submandibular gland and in its course runs on the hyoglossus between lingual and hypoglossal nerve and opens at the sublingual papilla at the side of frenum of tongue.

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