The Clavicle
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