Download The Clavicle - Deranged Physiology

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The Clavicle
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The clavicle is an S-shaped long bone, which forms part of the pectoral girdle
It articulates proximally with the sternum and distally with the acromion of scapula
Bony features include:
 Acromial facet
 Sternal facet
 Impression for costoclavicular ligament
 Subclavian groove
 Conoid tubercle
 Trapezoid line
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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
coracoclavicular ligament
Sternal facet
Subclavian groove:
site of attachment of the
subclavius muscle
Acromial facet
Impression for the
costoclavicular ligament
which binds the clavicle to
the first rib
Rough inferior surface of the
shaft, over the first rib
Trapezoid line, attachment of the
trapezoid ligament
which is the lateral part of the
coracoclavicular ligament
FACTOIDS
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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
THE CLAVICLE IS THE FIRST LONG BONE TO OSSIFY in the embryo (5th-6th 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