Action of digastric muscle:

 # Following is the action of digastric muscle:

A. Elevates the mandible and depresses the hyoid bone

B. Elevates the hyoid bone and depresses the mandible

C. Depresses the mandible as well as hyoid bone

D. Elevates the mandible as well as hyoid bone

The correct answer is B. Elevates the hyoid bone and depresses the mandible.

Digastric muscle depresses the mandible when the mouth is opened widely or against resistance and elevates the hyoid bone.

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Temporalis muscle originates from:

 # Temporalis muscle originates from:

A. Side of the skull

B. Zygomatic process

C. Ramus of the mandible

D. Pterygopalatine fossa

The correct answer is A. Side of the skull.

Temporalis muscle arises from temporal fossa and temporal fascia and inserts into deep surface of coronoid and anterior border of the ramus of mandible. 

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Medial pterygoid muscle is attached to:

 # Medial pterygoid muscle is attached to:

A. Medial surface of lateral pterygoid plate

B. Lateral surface of medial pterygoid plate

C. Medial surface of medial pterygoid plate

D. Lateral surface of lateral pterygoid plate

The correct answer is A. Medial surface of the lateral pterygoid plate

Deep head of the medial pterygoid muscle arises from medial surface of lateral pterygoid plate and palatine bone. The lateral pterygoid muscle arises from lateral surface of lateral pterygoid plate.

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Lymphatic drainage of TMJ:

 # Lymphatic drainage of TMJ is mainly to:

A. Submandibular nodes

B. Submental nodes

C. Deep cervical nodes

D. Parotid nodes

The correct answer is D. Parotid nodes.

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