GENERAL INFORMATION
The subclavius is a small, triangular muscle located under the clavicle. It plays an essential role in stabilising the clavicle during upper limb movements, which is crucial for maintaining shoulder stability and proper arm function.
ORIGIN
The subclavius originates from the first rib at the junction of the rib and its costal cartilage. Therefore, its origin point is well-positioned to support its function in clavicle stabilisation.
INSERTION POINT
The subclavius inserts into the inferior surface of the middle third of the clavicle. Thus, its insertion point is crucial for connecting the clavicle to the ribcage and facilitating shoulder movements.
MAJOR ARTERIES
The subclavius receives its blood supply from the clavicular branch of the thoracoacromial artery. Consequently, this artery ensures that the muscle gets adequate blood flow to perform its functions effectively.
NEURAL INNERVATION
The subclavian nerve from the brachial plexus innervates the subclavius. Therefore, proper nerve function is essential for the activation and control of this muscle.
TRIGGER POINT
Trigger points may develop along the muscle belly beneath the clavicle. As a result, addressing these trigger points through massage or other therapies can alleviate discomfort and improve muscle function.
CONCENTRIC FUNCTION
The subclavius depresses and pulls the clavicle medially to stabilise it during upper-limb movements. Thus, it plays a crucial role in shoulder and arm movements.
ECCENTRIC FUNCTION
During an eccentric contraction, the subclavius controls the upward movement of the clavicle. Consequently, it helps maintain stability during the relaxation phase of movements.
ISOMETRIC FUNCTION
The subclavius helps stabilise the clavicle during arm movements, providing essential support during various physical activities.
RELATED MUSCLES (SCIENTIFIC NAMES)
- Pectoralis Major: This muscle aids in the movement and stabilisation of the shoulder joint.
- Pectoralis Minor: Assists in scapular movements and helps stabilise the shoulder blade.
- Trapezius: Plays a key role in moving, rotating, and stabilising the scapula and extending the neck.
- Serratus Anterior: Essential for the protraction and upward rotation of the scapula.
ANTAGONIST MUSCLES
- Levator Scapulae: Elevates the scapula and assists in its downward rotation.
- Rhomboids: Retracts the scapula and aids in its downward rotation.
- Trapezius: Acts antagonistically during certain shoulder and scapular movements.
COMMON INJURIES
- Contact sports injuries: Rare but may occur due to direct trauma, causing pain and limited movement.
- Overuse injuries Can lead to discomfort and tightness in the shoulder area, affecting arm movements.
- Trauma: Direct hits or falls can result in strains or bruising of the subclavius.
EXERCISES
- Push-ups: Engage the subclavius indirectly by working the chest, shoulders, and triceps.
- Bench presses: Target the pectoral muscles and indirectly strengthen the subclavius.
- Pull-ups: Enhance upper body strength and engage the subclavius through the shoulder
- Dips: Focus on the triceps and chest, indirectly involving the subclavius.
- Shoulder presses: Strengthen the deltoids and stabilise the shoulder, indirectly working the subclavius.
STRETCHES
- Cross-body shoulder stretch: Stretches the subclavius and shoulder muscles by holding your arm across your body.
- Overhead shoulder stretch: Increases flexibility by extending the arm overhead and gently pulling the elbow behind the head.
- Doorway stretch: Enhances flexibility by placing your arms on a doorframe and leaning forward to stretch the chest and subclavius.
- Foam roller chest stretch: Relieves tension by lying on a foam roller placed along the spine and extending the arms out.
- Neck side stretch: Stretches the neck and upper shoulder area by tilting the head to one side and gently pulling with the opposite hand.