Overview

The rhomboid major and minor are paired muscles between your spine and shoulder blade. They pull the scapula inward and help keep it steady during reaching, rowing and carrying.

Location

Rhomboid minor sits higher, near the level of the base of the neck
Rhomboid major lies directly below it
Both sit beneath the trapezius

Origin, Insertion, Nerve Supply, and Action

Origin: Lower cervical and upper thoracic spinous processes
Insertion: Medial border of the scapula
Nerve supply: Dorsal scapular nerve, mainly C4–C5
Action: Retract and downwardly rotate the scapula; help secure it to the chest wall

In plain language, they draw your shoulder blade toward your spine and stop it from drifting too far forward during loaded movements.

Function

Retract the scapula during rowing
Assist downward rotation
Help maintain shoulder-blade position during arm movement
Work with the middle trapezius and levator scapulae

Structures It Connects To

Scapula
Cervical and thoracic spine
Trapezius
Dorsal scapular nerve

Movements It Assists

Pulling the shoulder blades together
Rowing and climbing
Controlling the return from an overhead reach

Common Injuries

Muscular strain after forceful pulling or lifting
Fatigue during prolonged sitting or repeated upper-limb work
Weakness after dorsal scapular nerve injury

Pain Referral Patterns

Discomfort is commonly described between the inner border of the scapula and the spine. Neck, rib, thoracic-joint and nerve problems can produce similar pain, so tenderness in this region does not automatically mean a rhomboid injury.

Clinical Relevance

Rhomboid strength is interpreted as part of the whole scapular system. Excessive “pinching back” is not always better; the scapula must also rotate and move freely during overhead activity.

Interesting Facts

Rhomboid minor and major often blend together, which is why they are commonly trained and discussed as one group.
Their name describes their roughly diamond-like shape.

Dorsal scapular nerve — supplies both rhomboids
Levator scapulae — shares the same nerve supply
Trapezius — overlies the rhomboids
Scapula — their moving attachment

References

OpenStax. "Muscles of the Pectoral Girdle and Upper Limbs." https://openstax.org/books/anatomy-and-physiology-2e/pages/11-5-muscles-of-the-pectoral-girdle-and-upper-limbs
StatPearls. "Anatomy, Back, Rhomboid Muscles." https://www.ncbi.nlm.nih.gov/books/NBK534856/
Standring S, ed. Gray's Anatomy. Elsevier.

Rhomboid Major and Minor