Infraspinatus muscle

This video tutorial covers the anatomy of the teres minor muscle, part of the rotator cuff in the upper arm. It explains the muscle's origin from the lateral scapula border and insertion on the greater tubercle of the humerus. The axillary nerve innervates the teres minor, which plays a role in external rotation and stabilization of the shoulder joint. The tutorial also compares the teres minor with the teres major, highlighting their different functions. Additional resources for further learning are provided.

Which nerve is responsible for innervating the teres minor muscle?

• Median nerve

• Axillary nerve

• Radial nerve

• Ulnar nerve

What is the primary role of the rotator cuff in shoulder movement?

• Flexion of the elbow

• Extension of the wrist

• Abduction of the fingers

• Internal and external rotation of the upper arm

What is the main function of the teres minor muscle?

• Flexion of the shoulder

• External rotation of the arm

• Extension of the elbow

• Internal rotation of the arm

How can you differentiate between the actions of the teres major and teres minor muscles?

• Teres major performs actions similar to the latissimus dorsi, while teres minor performs actions similar to the infraspinatus.

• Teres major is involved in external rotation, while teres minor is not.

• Teres major originates from the humerus, while teres minor does not.

• Teres major is innervated by the axillary nerve, while teres minor is not.

Which muscle works in conjunction with the teres minor to perform similar actions?

• Supraspinatus

• Deltoid

• Infraspinatus

• Subscapularis