Mixed nerve of the upper limb
The suprascapular nerve is a mixed (sensory and motor) nerve that branches from the upper trunk of the brachial plexus. It is derived from the ventral rami of cervical nerves C5-C6. It provides motor innervation to the supraspinatus muscle, and the infraspinatus muscle.
Structure
Origin
The suprascapular nerve arises from the upper trunk of the brachial plexus which is formed by the union of the ventral rami of the cervical nerves C5-C6.[1]
Course and relations
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 through the suprascapular canal,[1] in which it enters via the suprascapular notch inferior to the superior transverse scapular ligament and enters the supraspinous fossa.[2] 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.[citation needed]
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.
