Interactive Biology TV: Superficial Extrinsic Shoulder Muscles

What are the two superficial extrinsic shoulder muscles discussed in the video?

• Biceps and Triceps

• Trapezius and Latissimus Dorsi

• Deltoid and Pectoralis Major

• Serratus Anterior and Rhomboids

Where does the trapezius muscle originate from?

• Medial third of the superior nuchal line

• Lateral third of the clavicle

• Greater tubercle of the humerus

• Inferior angle of the scapula

What is the role of the nuchal ligament in the trapezius muscle?

• It is part of the origin

• It is not related to the trapezius

• It is part of the insertion

• It is part of the action

Which part of the trapezius muscle is responsible for elevating the scapula?

• Upper portion

• Lower portion

• Entire muscle

• Middle portion

What action is performed by the middle portion of the trapezius muscle?

• Rotation of the scapula

• Retraction of the scapula

• Elevation of the scapula

• Depression of the scapula

Which muscle originates from the spinous processes of T7 to T12?

• Trapezius

• Latissimus Dorsi

• Deltoid

• Pectoralis Major

Where does the latissimus dorsi muscle insert?

• Intertubercular groove of the humerus

• Acromion process

• Greater tubercle of the humerus

• Lesser tubercle of the humerus

What action is caused by the contraction of the latissimus dorsi muscle?

• Adduction of the arm

• Abduction of the arm

• Flexion of the arm

• Elevation of the scapula

Which muscle is responsible for internal rotation of the arm?

• Trapezius

• Latissimus Dorsi

• Deltoid

• Serratus Anterior

Which muscle can cause extension of the arm when it contracts?

• Trapezius

• Latissimus Dorsi

• Deltoid

• Pectoralis Major