How many muscles in human back?
Firstly, I assume that you are referring to the area below the neck and above the gluteal region. Also, some muscles are technically in the back but don’t act on the back, notably some of the rotator cuff muscles around the scapula. So the number varies depending on how you define the back (for example, the deltoid is thought to cover the shoulder but its fibres reach onto the scapula in the back). I will include them for this answer, since technically they are in the back. You have: The superficial extrinsic back muscles of Trapezius Rhomboid major and minor Levator scapulae Latissimus dorsi The intermediate extrinsic back muscles of Serratus posterior superior Serratus posterior inferior (sometimes grouped together as serratus posterior) The superficial intrinsic back muscles of Splenius cervicis Splenius capitis The intermediate intrinsic back muscles of Iliocostalis Longissimus Spinalis These are sometimes collectively referred to as Erector Spinae The deep intrinsic back muscles g
