Muscle Functions and Anatomy

The video tutorial covers the muscles of the head and neck, detailing their origins, insertions, and actions. It begins with an overview of facial muscles, including those responsible for expressions and mastication. The tutorial then transitions to neck muscles, highlighting the sternocleidomastoid and its role in dividing the neck into anatomical triangles. The video concludes with a discussion on the suprahyoid and infrahyoid muscles, emphasizing their functions and innervations.

Which nerve innervates the facial muscles?

• Hypoglossal nerve

• Accessory nerve

• Facial nerve

• Trigeminal nerve

What is the main action of the occipitofrontalis muscle?

• Depress the lower lip

• Elevate the eyebrows

• Close the eyes

• Retract the angle of the mouth

Which muscle is responsible for forming dimples when smiling?

• Risorius

• Zygomaticus major

• Orbicularis oculi

• Buccinator

What is the primary action of the orbicularis oculi muscle?

• Wrinkle the nose

• Elevate the upper lip

• Open the mouth

• Close the eyes tightly

Which muscle elevates the upper lip and opens the nostrils?

• Levator labii superioris

• Depressor anguli oris

• Platysma

• Mentalis

Which muscle is involved in whistling and keeping food in the mouth?

• Orbicularis oris

• Temporalis

• Masseter

• Buccinator

What is the main function of the masseter muscle?

• Open the mouth

• Elevate the mandible

• Retract the mandible

• Protrude the mandible

Which muscle divides the neck into anterior and posterior triangles?

• Trapezius

• Platysma

• Sternocleidomastoid

• Omohyoid

Which muscle is responsible for depressing the hyoid bone?

• Sternohyoid

• Geniohyoid

• Mylohyoid

• Stylohyoid

In which neck triangle can you find the submandibular gland?

• Submandibular triangle

• Carotid triangle

• Muscular triangle

• Occipital triangle