Author: Jana Vasković•Reviewer: Gordana SendicLast reviewed: September 30, 2021Reading time: 13 minutes


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Back muscles

The muscles the the back are a group of strong, combine muscles that lie top top the posterior aspect of the trunk. They administer movements of the spine, security to the trunk, as well as the coordination in between the movements of the limbs and trunk.The earlier muscles are split into two big groups:

The intrinsic (deep) earlier muscles, i beg your pardon are also called true back muscles. Lock are located deep to the extrinsic muscles, gift separated indigenous them by the thoracolumbar fascia. Your primary role is to develop movements that the vertebral column. These muscles are split into superficial, deep, and deepest layers.

This article will introduce you to the anatomy that the ago muscles.

You are watching: Large paired superficial muscle of the lower back

Key facts around the earlier muscles
Extrinsic/superficial ago musclesImmigrant muscle of the upper limb the lie superficially in the back.- Superficial layer: trapezius, latissimus dorsi, levator scapulae, rhomboid muscles- Intermediate layer: serratus posterior musclesAll this muscles room innervated through the anterior rami that cervical spinal nerves other than for the trapezius (accessory nerve CN XI).
Intrinsic/deep back musclesTrue muscles of the ago that lied deep come the thoracolumbar fascia.- Superficial layer: splenius muscles, erector spinae muscles- Deep layer: transversospinal (semispinalis, multifidus and also rotatores)- Deepest layer: interspinales and intertransversarii musclesAlmost every one of these muscles space innervated by the posterior rami that spinal nerves.

The extrinsic muscles of the back, as stated earlier, functionally belong come the muscles of the top limb yet are uncovered superficially ~ above the posterior trunk. They are split into:

Superficial extrinsic muscle of the back: trapezius, latissimus dorsi, rhomboid major, rhomboid minor, and levator scapulaeIntermediate extrinsic muscles of the back: serratus posterior superior and serratus posterior worse muscles.

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All the extrinsic back muscles are innervated through the anterior(ventral) rami that the cervical spinal nerves, except for the trapezius muscle i beg your pardon receives its supply from the accessory nerve (CN XI).