Rhomboid Minor
Shoulder & Scapula · Upper Limb
The Rhomboid Minor is found among the Shoulder & Scapula muscles of the Upper Limb. Its origin is Nuchal ligament and spinous processes of C7–T1, and it inserts onto Medial border of scapula, at root of the spine. It is responsible for several movements: Retracts and downwardly rotates scapula; fixes scapula to thoracic wall. It is innervated by 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 and downwardly rotates scapula; fixes scapula to thoracic wall
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 movements: Retracts and downwardly rotates scapula; fixes scapula to thoracic wall.
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 and downwardly rotates scapula). This is why knowing the innervation is central to localising nerve lesions in clinical practice.
How to study the Rhomboid Minor (the OIANS method)
OIANS stands for Origin, Insertion, Action and Nerve, the four facts that uniquely define every skeletal muscle. To learn the Rhomboid Minor, work through them in order: picture its origin, trace the muscle to its insertion, reason out the action that shortening between those two points must create, then add the nerve that drives it.
Most students remember the Rhomboid Minor fastest by linking its action back to its attachments rather than memorising each fact in isolation. Once the origin and insertion make sense, the action usually follows logically.
Rhomboid Minor quick facts
- Region
- Upper Limb
- Group
- Shoulder & Scapula
- Origin
- Nuchal ligament and spinous processes of C7–T1
- Insertion
- Medial border of scapula, at root of the spine
- Action
- Retracts and downwardly rotates scapula; fixes scapula to thoracic wall
- Nerve
- Dorsal scapular nerve (C4, C5)
- Spinal roots
- C4, C5
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 and downwardly rotates scapula; fixes scapula to thoracic wall
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
Test yourself on Upper Limb muscles with interactive quizzes and flashcards in the free OIANS app.
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