Middle back

The muscles between the shoulder blades that pull them together and hold them onto the ribcage. They are the antidote to a rounded, hunched-forward posture.

This muscle in 3D

Drag to rotate · scroll to zoom — see the shape, origin and insertion of the middle back. 3D model via Sketchfab (CC-BY).

Anatomy

Muscles: Rhomboids (major & minor), middle trapezius

Origin: Lower cervical and upper thoracic vertebrae (spinous processes).

Insertion: Medial (inner) border of the scapula.

Actions:

Scapular retraction (squeeze the shoulder blades together)
Scapular stabilisation against the ribcage
Downward rotation and elevation of the scapula (rhomboids)

How the muscle works

They anchor the shoulder blade so the arm has a stable base. Every horizontal pull (row) retracts the scapula via these muscles; posturally they resist the shoulders drifting forward.

Fibre-type bias: Postural, endurance-biased (type I).

Functional role: Posture, shoulder-blade control, and a strong base for all pulling and pressing.

Common problems

Interscapular aching from prolonged desk posture
Weakness → rounded shoulders and shoulder-impingement risk

Training & stretching

Rows, face pulls, scapular retractions, prone Y-T-W raises.

Cross-body reach; thoracic 'hug and round' between the blades.