091 Supraspinatus, Infraspinatus, and Teres Minor

Leslie Samuel introduces three intrinsic shoulder muscles: supraspinatus, infraspinatus, and Terry's minor. The video details their origins, insertions, and functions. Supraspinatus originates from the supraspinous fossa and initiates abduction of the humerus. Infraspinatus originates from the infraspinous fossa and causes external rotation. Terry's minor originates from the lateral border of the scapula, contributing to external rotation and adduction. The video concludes with a review of these muscles' roles in shoulder movement.

Which of the following muscles is NOT discussed in the video?

• Teres Minor

• Infraspinatus

• Supraspinatus

• Teres Major

What is the primary action of the supraspinatus muscle?

• Flexion of the humerus

• Initiation of abduction of the humerus

• External rotation of the humerus

• Adduction of the humerus

Where does the supraspinatus muscle insert?

• Lower facet of the greater tubercle

• Superior facet of the greater tubercle

• Middle facet of the greater tubercle

• Lesser tubercle

What is the main function of the infraspinatus muscle?

• Flexion of the humerus

• Internal rotation of the humerus

• External rotation of the humerus

• Abduction of the humerus

From where does the infraspinatus muscle originate?

• Lateral border of the scapula

• Infraspinous fossa

• Supraspinous fossa

• Acromion

What additional action does the teres minor muscle assist with besides external rotation?

• Abduction of the humerus

• Adduction of the humerus

• Flexion of the humerus

• Extension of the humerus

Where does the teres minor muscle insert?

• Lower facet of the greater tubercle

• Lesser tubercle

• Middle facet of the greater tubercle

• Superior facet of the greater tubercle