Muscle Functions and Actions

This lecture covers the anatomy of muscles in the neck, head, face, abdomen, thorax, and back. It details the origin, insertion, and function of each muscle group, including those involved in facial expressions, mastication, and respiration. The lecture emphasizes the importance of understanding muscle actions and encourages practical learning through facial exercises.

Which muscle is responsible for elevating the scapula and also abducting and rotating the neck?

• Sternohyoid

• Sternocleidomastoid

• Levator scapulae

• Scalenes

What is the primary function of the frontalis muscle?

• To elevate the corners of the mouth

• To depress the lower lip

• To raise the eyebrows

• To close the eyelids

Which muscle originates from the temporal fossa and helps in closing the mandible?

• Buccinator

• Lateral pterygoid

• Temporalis

• Masseter

Which muscle is responsible for compressing the cheeks and is involved in suckling?

• Mentalis

• Buccinator

• Orbicularis oris

• Zygomaticus major

What is the main action of the external abdominal oblique muscles?

• Compressing the abdominal wall

• Adducting the scapula

• Flexing the vertebral column

• Elevating the ribs

Which muscle group is known for forming the 'six-pack' abs?

• Rectus abdominis

• Transversus abdominis

• External obliques

• Internal obliques

What is the primary function of the serratus anterior muscle?

• To adduct the scapula

• To elevate the ribs

• To abduct the scapula

• To compress the abdominal wall

Which muscle is the major muscle of respiration, forming a dome between the thoracic and abdominal cavities?

• Multifidus

• Diaphragm

• Intercostals

• Erector spinae

What is the function of the erector spinae muscles?

• To elevate the ribs

• To extend and rotate the vertebral column

• To flex the vertebral column

• To compress the abdominal wall

Which muscle is responsible for adducting the scapula and originates from the spines of T2 to T5?

• Levator scapulae

• Rhomboideus major

• Rhomboideus minor

• Serratus anterior