Shoulder abduction involves all the following except –
**Core Concept**
Shoulder abduction is a movement of the shoulder joint that involves the rotation of the humerus (upper arm bone) away from the body's midline, resulting in the arm being lifted out to the side. This movement is primarily facilitated by the deltoid muscle and the supraspinatus muscle.
**Why the Correct Answer is Right**
The deltoid muscle, specifically its middle and upper fibers, plays a crucial role in shoulder abduction by contracting and pulling the humerus upward. The supraspinatus muscle helps to stabilize the glenohumeral joint and assists in the initial phase of abduction. Additionally, the teres minor muscle also contributes to shoulder abduction by helping to rotate the humerus outward.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not provided, so we cannot evaluate its correctness.
* **Option B:** This option is also not provided, so we cannot evaluate its correctness.
* **Option C:** This option is not provided, so we cannot evaluate its correctness.
* **Option D:** This option is also not provided, so we cannot evaluate its correctness.
**Clinical Pearl / High-Yield Fact**
The supraspinatus muscle is often the first to be affected in conditions like rotator cuff tears, leading to pain and weakness in the shoulder. Early recognition and treatment of supraspinatus muscle pathology can prevent further damage and improve patient outcomes.
**Correct Answer:** None of the above options are listed, as the question lacks options A, B, C, and D.