Clinical Anatomy - Lab 10

What is the origin of the medial pterygoid muscle?

(a)  

• Medial surface of ramus and angle of mandible

• Lateral pterygoid plate of sphenoid bone
• Posteriolateral plate of ethmoid bone
• Condyle of the mandible

What is the insertion point of the medial pterygoid muscle?

(a)  

• Medial surface of ramus and angle of mandible
• Lateral pterygoid plate of sphenoid bone

• Condyle of mandible

• Posteriolateral plate of ethmoid bone

What action does the medial pterygoid muscle perform?

(a)  

• Depresses mandible, assists in protrusion
• Elevates the mandible, aissists in retraction
• Elevates mandible, assists in protrusion
• Depresses mandible, assist in retraction

What is the origin of the superior head of the lateral pterygoid muscle?

(a)  

• Lateral surface of greater wing of sphenoid
• Lateral surface of lateral pterygoid plate

• Condyle of mandible

• Temporomandibular joint

What is the insertion point of the lateral pterygoid muscle?

• Lateral surface of greater wing of sphenoid

• Lateral surface of lateral pterygoid plate

• Condyle of mandible, temporomandibular joint

• Mandibular division of trigeminal nerve

What action is performed by the lateral pterygoid muscle?

• Opens jaw, protrudes mandible, moves mandible laterally for grinding teeth

• Elevates the mandible

• Closes jaw, retracts mandible, moves mandible up and down

• Depresses mandible

The nerve supply to the lateral pterygoid muscle is the (a)   division of the trigeminal nerve.

What is the origin of the temporalis muscle?

(a)  

• Temporal fossa
• Coronoid process and anterior border of ramus of mandible

• Condyle of the mandible

• Supraspinous fossa

The insertion point of the temporalis muscle is (a)  

• Temporal fossa
• Coronoid process of mandible
• Condyle of mandible
• Supraspinous fossa

What action does the temporalis muscle perform?

• Depresses, retracts mandible closing mouth, biting

• Elevates, protrudes mandible opening mouth

• Depresses, protrudes mandible opening mouth

• Elevates, retracts mandible closing mouth, biting