Muscles of the Head and Neck: Functions and Actions Explained

The video tutorial provides a comprehensive overview of the muscles of the head and neck. It begins with the muscles of mastication, including the temporalis, masseter, and buccinator. The tutorial then covers the muscles of facial expression, such as the frontalis, orbicularis oculi, and zygomaticus. It proceeds to discuss the lateral and posterior neck muscles, including the sternocleidomastoid, scalenes, and trapezius. Finally, the video explains the suprahyoid and infrahyoid muscles, detailing their roles in elevating and depressing the hyoid bone.

Which muscle is responsible for elevating the mandible and originates from the fossa temporalis?

• Lateral Pterygoid

• Temporalis

• Buccinator

• Masseter

What is the primary function of the buccinator muscle?

• Draw the angle of the mouth upwards

• Compress the cheek

• Elevate the mandible

• Pull the lower lip downward

Which muscle is responsible for the squinting action around the eyes?

• Levator labi superioris

• Orbicularis oculi

• Zygomaticus major

• Orbicularis oris

What is the function of the zygomaticus major muscle?

• Compress the cheek

• Pull the lower lip downward

• Draw the angle of the mouth upwards and backwards

• Elevate the upper lip

Which muscle helps to pull the ear and the skin of the ear forward?

• Auricularis superior

• Sternocleidomastoid

• Auricularis anterior

• Auricularis posterior

What is the primary function of the sternocleidomastoid muscle?

• Extend the neck

• Elevate the scapula

• Compress the cheek

• Flex the neck and assist in inhalation

Which muscle is designed to elevate the scapula?

• Semispinalis capitis

• Splenius capitis

• Trapezius

• Levator scapulae

What is the function of the trapezius muscle?

• Draw the angle of the mouth downwards

• Flex the neck

• Compress the cheek

• Elevate the scapula and extend the neck

Which muscle is part of the suprahyoid group and can depress the mandible if the hyoid bone is fixed?

• Mylohyoid

• Geniohyoid

• Digastric anterior belly

• Stylohyoid

What is the primary role of the infrahyoid muscles?

• Extend the neck

• Flex the neck

• Depress the hyoid bone

• Elevate the hyoid bone