The Rotator Cuff Muscles: Supraspinatus
The “rotator cuff” gets its name as a result of the common tendinous attachment of all of the rotator cuff muscles and the way that the attachment sits over the head of the humerus. This common tendinous attachment drapes over the top of the humerus and resembles a shirt cuff enough that someone decided to called it the rotator “cuff”!
The rotator cuff muscles are sometimes referred to as the SITS muscles. Each letter stands for one of the muscles in the group.
- Teres Minor
I often refer to the rotator cuff muscles as dynamic stabilizers since they both stabilize and control the movement of the head of the humerus.
What does supraspinatus mean?
- Supra is similar to the word superior and means above.
- Spinatus refers to the spine of the scapula – that’s the ridge on the scapula that is almost horizontal.
Where does the supraspinatus muscle attach?
- On the scapular end, the supraspinatus muscle attaches to a depression (fossa) on the top of the scapula that is technically called the supraspinous fossa.
- On the other end it attaches onto the very top of the head of the humerus.
What actions does the supraspinatus muscle do?
- In terms of movement, supraspinatus does only one action, abduction of the humerus (first 10 degrees).
- It also stabilizes the head of the humerus in the socket.
What are the common injuries to the supraspinatus muscle?
Rotator Cuff Tear
When a tear occurs, the person typically has difficulty abducting their arm and often leans to the side in order to make it seem like their arm is abducting.
Symptoms can include generalized shoulder pain. It’s not uncommon for someone with a rotator cuff tear to be woken at night by the pain.
People who get this condition often wake up one morning and have extremely limited range of motion. Sometimes the cause is completely unknown (idiopathic), sometimes it stems from rotator cuff tears, and sometimes it arises just from an acute strain of the shoulder.
Postures Where The Supraspinatus Contracts
Postures Where The Supraspinatus Lengthens
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