The suprascapular nerve is a nerve that arises from the brachial plexus. It is responsible for the innervation of some of the muscles that attach on the scapula, namely the supraspinatus and infraspinatus muscles.
The right brachial plexus with its short branches, viewed from in front. (Suprascapular labeled at upper left.)
|From||C5–C6 of brachial plexus|
|Anatomical terms of neuroanatomy|
The suprascapular nerve arises from the upper trunk of the brachial plexus which is formed by the union of the ventral rami of the fifth and sixth cervical nerves. After branching from the upper trunk, the nerve passes across the posterior triangle of the neck parallel to the inferior belly of the omohyoid muscle and deep to the trapezius muscle. It then runs along the superior border of the scapula, passes through the suprascapular notch inferior to the superior transverse scapular ligament and enters the supraspinous fossa. It then passes beneath the supraspinatus, and curves around the lateral border of the spine of the scapula through spinogleniod notch to the infraspinous fossa.
The suprascapular nerve is a mixed peripheral nerve containing motor and sensory components.
- Suprascapular paralysis, causing back pain, problems with abduction and external rotation of the humerus, and wasting away of supraspinatus and infraspinatus.
Supraspinatus muscle helps in 0°-15° arm abduction. And Infraspinatus helps in lateral rotation(external rotation) of humerus.