Rhomboid Minor
Shoulder & Scapula · Upper Limb
The rhomboid minor is a small, cord-like muscle lying just above rhomboid major and, like it, deep to trapezius. It originates from the lower nuchal ligament and the spinous processes of C7 and T1 and inserts onto the medial border of the scapula at the root of the spine. It retracts, elevates, and downwardly rotates the scapula, working with rhomboid major to fix and stabilise the shoulder girdle against the thoracic wall. Its nerve supply is the dorsal scapular nerve (C4, C5).
Origin, Insertion, Action & Nerve
Origin
Nuchal ligament and spinous processes of C7–T1
Insertion
Medial border of scapula, at root of the spine
Action
Retracts (pulls medially), elevates, and downwardly rotates the scapula, helping to stabilize the shoulder girdle
Nerve
Dorsal scapular nerve (C4, C5)
Attachments explained
The Rhomboid Minor is defined first by where it attaches. Its origin is the more fixed anchor, usually the proximal or more stable end that stays put during contraction, while its insertion is the more mobile point that is pulled toward the origin when the muscle shortens.
Origin
Nuchal ligament and spinous processes of C7–T1
Insertion
Medial border of scapula, at root of the spine
Action & function
When the Rhomboid Minor contracts, it produces the following movement: Retracts (pulls medially), elevates, and downwardly rotates the scapula, helping to stabilize the shoulder girdle.
As part of the Shoulder & Scapula group of the Upper Limb, it works alongside neighbouring muscles to generate smooth, coordinated movement and to stabilise the structures it acts on.
Nerve supply & clinical relevance
The Rhomboid Minor receives its nerve supply from the Dorsal scapular nerve (C4, C5). This nerve carries fibres from spinal segment(s) C4, C5.
Because a muscle can only contract when its nerve is intact, injury to the Dorsal scapular nerve or to its spinal roots (C4, C5) can weaken or paralyse the Rhomboid Minor, impairing the movements it normally produces (retracts (pulls medially), elevates, and downwardly rotates the scapula, helping to stabilize the shoulder girdle). This is why knowing the innervation is central to localising nerve lesions in clinical practice.
How to study the Rhomboid Minor (the OIANS method)
Study rhomboid minor as the higher, slimmer twin of rhomboid major, arising a level or two above it (C7 to T1 versus T2 to T5) and inserting at the root of the scapular spine. Their actions are identical, so the only things to keep distinct are the vertebral levels and the precise point on the medial border.
Bundle its nerve supply with rhomboid major and levator scapulae under the dorsal scapular nerve, and treat all three as scapular stabilisers rather than arm movers. This grouping keeps the small posterior scapular muscles organised and prevents them blurring together.
Frequently asked questions
Where is the Rhomboid Minor located?
The Rhomboid Minor is a muscle of the Shoulder & Scapula group, located in the Upper Limb.
What is the origin of the Rhomboid Minor?
Nuchal ligament and spinous processes of C7–T1
What is the insertion of the Rhomboid Minor?
Medial border of scapula, at root of the spine
What movements does the Rhomboid Minor produce?
Retracts (pulls medially), elevates, and downwardly rotates the scapula, helping to stabilize the shoulder girdle
What nerve supplies the Rhomboid Minor?
Dorsal scapular nerve (C4, C5)
Is the Rhomboid Minor free to study in OIANS?
Yes. The Rhomboid Minor is free in OIANS: its full origin, insertion, action and nerve details are open to everyone in the Muscle Directory, and because it belongs to the Upper Limb it is also covered by the free Quiz and Flashcard decks. The other regions, the "All Muscles" deck, and the Progress and Explore tools are unlocked with a one-time Lifetime purchase.
Related muscles
Study the Rhomboid Minor
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