This nerve supplies infraspinatus and glenohumeral joint

The nerve that supplies the infraspinatus muscle and the glenohumeral joint is the suprascapular nerve.

Here are the steps to understand this:

1. The infraspinatus muscle is one of the four muscles of the rotator cuff, located at the back of the shoulder.

2. The glenohumeral joint is the ball-and-socket joint that connects the upper arm bone (humerus) to the shoulder blade (scapula).

3. The suprascapular nerve originates from the brachial plexus, specifically from the upper trunk formed by the fifth and sixth cervical nerves (C5 and C6).

4. This nerve passes through the suprascapular notch under the superior transverse scapular ligament, giving branches to the supraspinatus muscle and the shoulder joint.

5. It then wraps around the lateral border of the spine of the scapula, entering the infraspinatus fossa to innervate the infraspinatus muscle and the glenohumeral joint.

So, the suprascapular nerve