Rotator cuff muscles and deltoid muscle

The video tutorial provides an in-depth look at the rotator cuff and deltoid muscles, focusing on their anatomy, functions, and innervations. It covers the four rotator cuff muscles, known as the SITS muscles, and their roles in shoulder movement and stabilization. The tutorial also explains the deltoid muscle's structure and its contribution to shoulder movements. Innervation details are provided, highlighting the involvement of the brachial plexus and specific nerves.

What is the primary function of the supraspinatus muscle?

• Rotation of the wrist

• Extension of the knee

• Abduction of the humerus

• Flexion of the elbow

Which two muscles are responsible for the external rotation of the humerus?

• Supraspinatus and subscapularis

• Infraspinatus and teres minor

• Pectoralis major and latissimus dorsi

• Deltoid and biceps

Where does the subscapularis muscle insert?

• Coracoid process

• Greater tubercle of the humerus

• Lesser tubercle of the humerus

• Acromion process

What is the common function of the rotator cuff muscles?

• Rotation of the wrist

• Flexion of the shoulder

• Stabilization of the glenohumeral joint

• Extension of the elbow

What shape does the deltoid muscle resemble?

• Circle

• Square

• Triangle

• Rectangle

Which part of the deltoid muscle is responsible for shoulder abduction?

• Lateral belly

• Middle belly

• Anterior belly

• Posterior belly

Which nerve is responsible for innervating the deltoid and teres minor muscles?

• Radial nerve

• Ulnar nerve

• Axillary nerve

• Median nerve