Latin nervus suprascapularis TA A14.2.03.014 | Dorlands/Elsevier n_05/12566859 FMA 37025 | |
 | ||
Innervates supraspinatus, infraspinatus | ||
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.
Contents
Structure
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 to the infraspinous fossa.
Function
The suprascapular nerve is a mixed peripheral nerve containing motor and sensory components.
Motor innervation
Sensory innervation
In the supraspinous fossa it gives off two branches to the supraspinatus muscle and in the infraspinous fossa it gives off two branches to the infraspinatus muscle.