Muscle Functions and Actions

The video tutorial covers the muscles of the anterior thorax, including the pectoralis major, intercostals, and serratus anterior, as well as the abdominal wall muscles. It explains the functions of these muscles, their synergists and antagonists, and provides a detailed look at their anatomical structure using different models.

What is the role of a synergist muscle?

• To stabilize a joint

• To perform the same action as another muscle

• To perform the opposite action of another muscle

• To initiate muscle contraction

Which muscle is responsible for flexing the whole arm at the shoulder joint?

• Deltoid

• Pectoralis major

• Trapezius

• Latissimus dorsi

Which muscle acts as an antagonist to the pectoralis major during shoulder abduction?

• Teres major

• Latissimus dorsi

• Deltoid

• Subscapularis

What is the primary function of the external intercostal muscles?

• Flex the vertebral column

• Rotate the scapula

• Elevate the ribs

• Depress the ribs

Which muscle is responsible for protracting the scapula?

• Trapezius

• Serratus anterior

• Infraspinatus

• Rhomboid major

What is the function of the pectoralis minor?

• Elevate the ribs

• Protract the scapula

• Extend the arm

• Flex the forearm

Which muscle depresses the clavicle?

• Deltoid

• Subclavius

• Serratus anterior

• Pectoralis major

What is the primary action of the external oblique muscle?

• Flex the vertebral column

• Elevate the ribs

• Extend the vertebral column

• Rotate the scapula

Which muscle is known as the 'six-pack' muscle?

• Transversus abdominis

• Rectus abdominis

• Internal oblique

• External oblique

What is the function of the transversus abdominis?

• Compress the abdomen

• Elevate the ribs

• Rotate the scapula

• Flex the vertebral column