True Back Muscles | The Splenius & Erector Spinae Groups

The video tutorial explores the deep muscles of the back and spine, focusing on their roles in stabilization and movement. It distinguishes between superficial, intermediate, and deep layers, emphasizing that only the deep muscles are true back muscles. The splenius muscles, part of the deep layer, are discussed in detail, highlighting their origins, insertions, and functions in neck extension and rotation. The erector spinae group, another component of the deep layer, is examined for its powerful role in back extension and lateral flexion.

Explain the significance of the nuchal ligament in relation to the splenius muscles.

Identify the innervation of the splenius muscles.

What are the three regions of the iliocostalis muscle?

What distinguishes the longissimus muscle from the other erector spinae muscles?