Subclavius muscle

Subclavius Muscle – Anatomy Made Simple | Origin, Insertion, Nerve Supply & Clinical Notes

Topics covered
o Exact origin & insertion
o Nerve supply (Nerve to Subclavius)
o Actions made simple
o How it protects the subclavian vessels
o Clinical correlations: fractures of clavicle, subclavian vein access, thoracic outlet relevance
o Memory tricks to recall easily

🔑 Key Concepts &exam points
• Smallest muscle of the pectoral region.
• Origin:
 From 1st rib at its costochondral junction.
• Insertion:
 Subclavian groove on inferior surface of middle third of clavicle.
• Nerve Supply:
 Nerve to Subclavius (C5–C6) from upper trunk of brachial plexus.
• Action:
 Depresses the clavicle.
 Stabilizes sternoclavicular (SC) joint.
 Protects subclavian vessels & brachial plexus from clavicle movements.
• Unique point:
 Sometimes gives an accessory branch to phrenic nerve → “Accessory phrenic nerve”.
• Clinical correlation:
 Important in clavicle fractures, preventing upward displacement of bone.
 Landmark during subclavian vein catheterization.
 Relevant in thoracic outlet syndrome anatomy.
• Relations:
 Located between clavicle and first rib, lying just above subclavian vessels.
• Variation:
 May be absent in some individuals (exam trivia).
• Functionally:
 Acts as a protective cushion for underlying vessels & nerves.
• Mnemonic
💡 "S-D-N-C" → Subclavius: Depress–Nerve C5/C6"

0:00 -Start
0:02 - Introduction to the subclavius muscle
1:04 - Attachment and origin of the subclavius muscle
4:03 - Importance of the subclavius muscle in protecting underlying structures
5:37 - Nerve supply and action of the subclavius muscle

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