Subclavius
Shoulder & Scapula · Upper Limb
Subclavius belongs to the Shoulder & Scapula group of the Upper Limb. Its origin is Junction of 1st rib and its costal cartilage, and it inserts onto Inferior surface of middle third of clavicle. It is responsible for several movements: Depresses and stabilizes clavicle; steadies sternoclavicular joint. Its nerve supply is the Nerve to subclavius (C5, C6).
Origin, Insertion, Action & Nerve
Origin
Junction of 1st rib and its costal cartilage
Insertion
Inferior surface of middle third of clavicle
Action
Depresses and stabilizes clavicle; steadies sternoclavicular joint
Nerve
Nerve to subclavius (C5, C6)
Attachments explained
The Subclavius 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
Junction of 1st rib and its costal cartilage
Insertion
Inferior surface of middle third of clavicle
Action & function
When the Subclavius contracts, it produces the following movements: Depresses and stabilizes clavicle; steadies sternoclavicular joint.
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 Subclavius receives its nerve supply from the Nerve to subclavius (C5, C6). This nerve carries fibres from spinal segment(s) C5, C6.
Because a muscle can only contract when its nerve is intact, injury to the Nerve to subclavius or to its spinal roots (C5, C6) can weaken or paralyse the Subclavius, impairing the movements it normally produces (depresses and stabilizes clavicle). This is why knowing the innervation is central to localising nerve lesions in clinical practice.
How to study the Subclavius (the OIANS method)
OIANS stands for Origin, Insertion, Action and Nerve, the four facts that uniquely define every skeletal muscle. To learn the Subclavius, 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 Subclavius 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.
Subclavius quick facts
- Region
- Upper Limb
- Group
- Shoulder & Scapula
- Origin
- Junction of 1st rib and its costal cartilage
- Insertion
- Inferior surface of middle third of clavicle
- Action
- Depresses and stabilizes clavicle; steadies sternoclavicular joint
- Nerve
- Nerve to subclavius (C5, C6)
- Spinal roots
- C5, C6
Frequently asked questions
Where is the Subclavius located?
The Subclavius is a muscle of the Shoulder & Scapula group, located in the Upper Limb.
What is the origin of the Subclavius?
Junction of 1st rib and its costal cartilage
What is the insertion of the Subclavius?
Inferior surface of middle third of clavicle
What movements does the Subclavius produce?
Depresses and stabilizes clavicle; steadies sternoclavicular joint
What nerve supplies the Subclavius?
Nerve to subclavius (C5, C6)
Is the Subclavius free to study in OIANS?
Yes. The Subclavius 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 Subclavius
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