The Clavicle

The Clavicle is a long bone

It is horizontally placed

The Clavicle is a long bone

It is horizontally placed

The medial end of the Clavicle articulates with the manubrium at the Sternoclavicular Joint

The lateral end of the Clavicle articulates with the acromion of the scapula at the Acromioclavicular Joint

The Clavicle is divided into thirds along its length

Undersurface of Right Clavicle

Lateral Third

The lateral third is flattened and expanded

Undersurface of Right Clavicle

Medial Third

The medial third is rounded

Undersurface of Right Clavicle

The Clavicle is curved convex forwards at its medial end

Lateral Medial

Posterior

Anterior

The Clavicle is concave forwards at its lateral end

Lateral Medial

Posterior

Anterior

There are a number of impressions on the undersurface

Lateral Medial

Posterior

Anterior

This area gives attachment to the Trapezoid ligament

Lateral Medial

Posterior

Anterior

This is one of the two coracoclavicular ligaments that stabilise the acromioclavicular joint

This area gives attachment to the Conoid ligament

Lateral Medial

Posterior

Anterior

This is one of the two coracoclavicular ligaments that stabilise the acromioclavicular joint

This area gives attachment to the costoclavicular ligament that arises from the first costal cartilage and first rib

Lateral Medial

Posterior

Anterior

It stabilises the sternoclavicular joint

Sternoclavicular Joint

Manubrium

Clavicle

Manubrium

Costoclavicular Ligament anterior fibres

Manubrium

Clavicle

Manubrium

Costoclavicular Ligament posterior fibres

Manubrium

Clavicle

Manubrium

Anterior Sternoclavicular Ligament

Manubrium

Clavicle

Manubrium

Interclavicular Ligament

Manubrium

Clavicle

Manubrium

Interclavicular Ligament

Manubrium

Clavicle

Manubrium

Section through Sternoclavicular Joint

Manubrium

Clavicle

Manubrium

Section through Sternoclavicular Joint

Manubrium

Clavicle

Manubrium

Section through Sternoclavicular Joint

Articular Disc

Muscles that attach to the Clavicle

Muscles that attach to the Clavicle

Lateral Medial

Posterior

Anterior

Deltoid

Muscles that attach to the Clavicle

Lateral Medial

Posterior

Anterior

Pectoralis Major

Muscles that attach to the Clavicle

Lateral Medial

Posterior

Anterior

Subclavius

Muscles that attach to the Clavicle

Lateral Medial

Posterior

Anterior

Trapezius

Muscles that attach to the Clavicle

Lateral Medial

Posterior

Anterior

Sternohyoid

Summary of Muscles that attach to Clavicle

Deltoid

Pectoralis Major

Subclavius

Sternohyoid

Sternocleidomastoid

Trapezius

Lateral Chest Wall

DeltoidOrigin Lateral third of clavicle,

acromion, and spine of scapulaInsertion Deltoid tuberosity on lateral

shaft of humerusAction Anterior part: flexes and

internally rotates arm; Middle part: abducts arm; Posterior part: extends and externally rotates arm

Nerve Supply Axillary nerve (C5 and C6)Blood Supply Deltoid branch of

thoracoacromial artery

Anterior Chest WallPectoralis Major

Origin Clavicular head: anterior surface of medial half of clavicle; Sternocostal head: anterior surface manubrium & sternum, superior 6 costal cartilages, and aponeurosis of external oblique muscle

Insertion Lateral lip of bicipital groove of humerus

Action Clavicular head: flexes & adducts arm Sternal head: adducts & internally rotates arm

Nerve Supply Lateral and medial pectoral nerves (C5, C6, C7, C8, and T1)

Blood Supply pectoral branch of thoracoacromial trunk

SubclaviusOrigin Costochondral junction 1st

ribInsertion Subclavian groove inferior

surface middle clavicleAction Depresses clavicleNerve Supply Nerve to subclavius C5, 6Blood Supply Clavicular branch of

thoraco-acromial artery and suprascapular artery

Anterior Chest Wall

Posterior Chest Wall

TrapeziusOrigin Medial third of superior nuchal

line; external occipital protuberance, nuchal ligament, and spinous processes of thoracic vertebrae

Insertion Lateral third of clavicle, acromion, and spine of scapula

Action superior fibers elevate, middle fibers retract, and inferior fibers depress scapula

Nerve Supply Spinal root of accessory nerve (CN XI) (motor) and cervical nerves (C3 and C4) (pain and proprioception)

Blood Supply Transverse cervical artery