The multifidus muscle is one of the transversospinales muscles, which are a group of deep muscles within the back which lie deep to the erector spinae. There are three major muscle groups within the transversospinales: semispinalis, multifidus and rotares.
Origin
- Sacrum
- Posterior superior iliac spine
- Mammillary processes of L1-5
- Transverse processes of T1-12
- Articular processes of C3-7
Insertion
- Spinous processes of C2-L5
Action
- Postural and dynamic support of the vertebral column
Innervation
- Dorsal rami C3- L5