Rotator Cuff Muscles Categorization?

Asked by: Timothy Meza

They are also referred to as the SITS muscle, with reference to the first letter of their names (Supraspinatus, Infraspinatus,Teres minor, and Subscapularis, respectively). The muscles arise from the scapula and connect to the head of the humerus, forming a cuff around the glenohumeral (GH) joint.

What are the 4 muscles of the rotator cuff muscles?

Parts of the Rotator Cuff

• Supraspinatus controls internal rotation and lifting of the arm.
• Infraspinatus allows you to externally rotate your arm in the shoulder socket.
• Teres minor is a small muscle that helps rotate your arm.
• Subscapularis controls arm abduction (holding your arm out straight, away from your body).

How are rotator cuffs classified?

Rotator cuff tears can be classified according to size. DeOrio and Cofield (^,40) classified rotator cuff tears on the basis of greatest dimension as either small (<1 cm), medium (1–3 cm), large (3–5 cm), or massive (<5 cm) (^,Fig 4^,).

What are the 3 groups of shoulder muscles and list the muscles in each group?

The large shoulder muscles are responsible for most of the shoulder’s work.

• Trapezius is responsible for elevating the shoulder blade and rotating it during arm abduction.
• Deltoid is responsible for flexion and medial rotation of the arm. …
• Pectoralis major is responsible for arm adduction and medial rotation of the arm.

What are the 4 rotator cuff tendons?

The rotator cuff consists of four muscles. These are the subscapularis, the supraspinatus, the infraspinatus and the teres minor muscles. These muscles end in short, flat, broad tendons which fuse intimately with the fibrous capsule to form the musculotendinous cuff.

How many rotator cuff muscles are there?

four muscle tendons

There are four muscle tendons that connect to the shoulder that make up the rotator cuff. Together these four tendons stabilize the upper arm bone to the shoulder socket and allow the wide range of motion in the shoulder.

Why subscapularis is called Forgotten muscle?

The subscapularis tendon, at one point, was thought of as the forgotten tendon, with “hidden lesions” that referred to partial tears of this tendon.

What are the 4 main ligaments of the shoulder?

Ligaments in the shoulder are essential for a healthy shoulder.

• Glenohumeral Ligaments.
• Coraco-acromial Ligament.
• Coraco-clavicular Ligaments.
• Transverse Humeral Ligament.

How can I remember my rotator cuff muscles?

The tea is for Terry's minor. And then over on the lesser tubercle we got the subscapularis. If you remember sits you'll remember the rotator cuff muscles.

What is the infraspinatus muscle?

The infraspinatus is a thick triangular muscle that occupies much of the infraspinous fossa of the scapula. It is a member of the rotator cuff, commonly remembered by the mnemonic “SITS” (supraspinatus, infraspinatus, teres minor, subscapularis).

What is supraspinatus and infraspinatus?

The supraspinatus muscle abducts the upper arm (test with the arm at the side to avoid overlap with deltoid muscle function). The infraspinatus muscle externally rotates the upper arm at the shoulder.

Where are the distal supraspinatus and infraspinatus tendons?

The names of these muscle-tendon components of the rotator cuff are: the supraspinatus which runs over the top of the ball of the shoulder joint (humeral head); the subscapularis which runs across the front of the humeral head; and. the infraspinatus and the teres minor which run across the back of the humeral head.