All of the following are true about phrenic nerve, except
The phrenic nerves contain motor, sensory, and sympathetic nerve fibers. The phrenic nerve originates mainly from the 4th cervical nerve, but also receives contributions from the 5th and 3rd cervical nerves Both phrenic nerves run from C3, C4, and C5 along the anterior scalene muscle deep to the carotid sheath. The accessory phrenic nerve is a branch of the nerve to the subclavius Ref: BD Chaurasia; 7th edition
It is purely motor nerve
It arise from C4 spinal nerve
It is formed at the lateral order of scalenus anterior
Accessory phrenic is commonly a branch from the nerve of subcalvirus
Thorax