This document was created by Alex Yartsev ([email protected]); if I have used your data or images and forgot to reference you, please email me. The Clavicle o The clavicle is an S-shaped long bone, which forms part of the pectoral girdle o It articulates proximally with the sternum and distally with the acromion of scapula o Bony features include: . Acromial facet . Sternal facet . Impression for costoclavicular ligament . Subclavian groove . Conoid tubercle . Trapezoid line o

Right clavicle Smooth superior surface of the shaft, under the platysma muscle Deltoid tubercle: attachment of the deltoid

Acromial facet

Conoid tubercle, attachment of the conoid ligament which is the medial part of the Sternal facet coracoclavicular ligament

Subclavian groove: site of attachment of the subclavius muscle

Acromial facet

Impression for the Trapezoid line, attachment of the costoclavicular ligament Rough inferior surface of the trapezoid ligament which binds the clavicle to shaft, over the first rib which is the lateral part of the the first rib coracoclavicular ligament

FACTOIDS - Its occasionally pierced by a branch of the supraclavicular nerve - thicker and more curved in manual workers - weakest part is the junction of the middle and lateral thirds: most commonly fractured; more common in children - after a fracture, the sternocleidomastoid elevates the medial fragment of the clavicle, and the shoulder drops. - The lateral fragment of the clavicle gets pulled medially by the arm adductors, eg. pectoralis major th th - THE CLAVICLE IS THE FIRST LONG BONE TO OSSIFY in the embryo (5 -6 week) - Protects the neurovascular bundle supplying the upper arm, forming a bony boundary of the cervical canal - Transmits traumatic impact force from the upper limb to the axial skeleton - Contains NO MEDULLARY CAVITY -