Rhomboids Muscle: Origin, Insertion, Nerve Supply & Action

The rhomboid muscles are placed on either side of the upper back within the shoulder blades. The rhomboids muscles are attached to the edges of the shoulder blades to your spine, lie deep to the trapezius.There are two rhomboid muscles –

1.Rhomboid minor
2.Rhomboid major

Rhomboid Minor Muscle: Origin, Insertion, Nerve Supply & Action

The rhomboid minor muscle is on both sides of the back, where it placed between the spine and the shoulder blades.

Origin: Spinous processes of C7-T1 vertebrae
Insertion: Medial border of the scapula, at the level of the spine of scapula
Innervation: Dorsal scapular nerve.

Actions: Retraction and rotation of the scapula.

Rhomboid Minor Muscle: Origin, Insertion, Nerve Supply & Action

The rhomboid major muscle is on both sides of the back, within the spine and the shoulder blades.

Origin: Rhomboid Major originate from spinous processes of T2 – T5 vertebrae.
Insertion: It inserts into the medial border of the scapula from the level of the spine to the inferior angle.
Function: Rhomboid Major retract scapula and rotate it to depress glenoid cavity; fix scapula to thoracic wall.
Nerve Supply: Dorsal scapular nerve ( C4 and C5).
Blood Supply: Dorsal scapular artery.