Upper limb

Collarbone

Clavicula

Origin

S-shaped strut connecting the sternum (sternoclavicular joint) to the acromion of the scapula (acromioclavicular joint)

Insertion

Attachment site for pectoralis major, deltoid, trapezius, sternocleidomastoid, and subclavius muscles

Function

Acts as mechanical strut keeping upper limb away from thorax; transmits forces to axial skeleton; protects neurovascular bundle

Innervation

Supraclavicular nerves (C3–C4) and nerve to subclavius (C5–C6)

Movement & chain

Elevation, depression, anterior/posterior rotation, and protraction/retraction during shoulder movement

Palpation

Palpable subcutaneously along its entire length

Clinical

Clavicle fractures (one of the most common fractures in falls on outstretched hand or direct blow); AC joint separation

Segmental innervation

C3–C6

In clinical practice

Key anatomical landmark for subclavian vein catheterization and interscalene / supraclavicular nerve blocks

Region in the model

Upper limb