Main muscles of the head and neck

This tutorial explores the main muscles of the head and neck, including those involved in mastication, facial expression, and the suprahyoid and infrahyoid muscles. It provides detailed descriptions of each muscle's location, function, and innervation. The video also covers the muscles of the lateral neck and concludes with a discussion on Bell's Palsy, a condition affecting facial muscles.

Which muscle is known as the most powerful muscle of mastication?

• Masseter muscle

• Temporal muscle

• Lateral pterygoid muscle

• Medial pterygoid muscle

What is the primary function of the lateral pterygoid muscle?

• Retract the mandible

• Close the jaw

• Elevate the mandible

• Open the jaw

Which muscle is referred to as the 'frowning muscle'?

• Zygomaticus major

• Orbicularis oculi

• Risorius

• Corrugator supercilii

What is the function of the orbicularis oculi muscle?

• Elevate the upper lip

• Close the eyelid

• Raise the eyebrows

• Compress the nares

Which muscle assists in smiling by elevating the upper lip?

• Zygomaticus minor

• Buccinator

• Mentalis

• Depressor anguli oris

Which nerve innervates the digastric muscle's posterior belly?

• Accessory nerve

• Hypoglossal nerve

• Facial nerve

• Trigeminal nerve

What is the primary function of the omohyoid muscle?

• Elevate the mandible

• Depress the mandible

• Depress the hyoid bone

• Elevate the hyoid bone

Which muscle is an accessory muscle of inspiration?

• Platysma

• Sternocleidomastoid

• Orbicularis oris

• Zygomaticus major

What is the function of the platysma muscle?

• Elevate the hyoid bone

• Depress the mandible

• Depress the hyoid bone

• Elevate the mandible

What causes Bell's Palsy?

• Damage to the trigeminal nerve

• Damage to the hypoglossal nerve

• Damage to the facial nerve

• Damage to the accessory nerve