Ligaments of the pectoral girdle Flashcards
Shape and DoF for Anterior Sternoclavicular ligament
strong broad band
runs obliquely downwards and medially
Shape and DoF for Posterior sternoclavicular ligament
broad band
weaker than anterior sternoclavicular joint
obliquely downwards and medially
Shape and DoF for interclavicular ligament
many fibres forming a flat band
runs transversely
Shape and DoF for costoclavicular ligament
extremely strong, wide, extracapsular, short, dense band of fibres
anterior fibres run upwards and laterally
posterior fibres run upwards and medially
- forms a cruciate arrangement
Shape and DoF for coracoclavicular ligament
extremely powerful - two distinct bands
conoid fibres - fan shaped - lie posteromedially - run vertically upwards
trapezoid fibres - strong, flat and quadrilateral shaped - lies anterolaterally - runs obliquely
attachments of anterior sternoclavicular ligament
O: superior and anterior part of medial end of clavicle
I: t the front of the upper part of the manubrium stern
runs from lateral to medial
attachments of posterior sternoclavicular ligament
O: superior and posterior medial end of clavicle
I: to the back of the upper part of manubrium sterni
run from lateral to medial
attachments of interclavicular ligament
O: upper aspect of sternal end of one clavicle
cross the jugular notch (where some fibres attach)
I: upper aspect of the sternal end of the other clavicle
attachments of costoclavicular ligament
O: from the upper medial surface of the 1st rib and CC
I: anterior lamina- anterior lip of inferior clavicle
posterior lamina - posterior lip of inferior clavicle
attachments of coracoclavicular ligament
Conoid fibres:
O: posterior coracoid process
I: conoid tubercle on inferiolateral clavicle
Trapezoid fibres:
O: roughened ridge on superior coracoid process (anteriorly)
I: trapezoid line on inferior clavicle
bands separated by the synovial bursa
Functions of Anterior sternoclavicular ligament
strengthens the anterior JC
reinforced by tendinous origin of sternomastoid
Functions of Posterior sternoclavicular ligament
strengthens the posterior JC
reinforeced by sternal attachment of sternohyoid
Functions of interclavicular ligament
strengthens superior JC
Functions of costoclavicular ligament
limits elevation of the clavicle
compensates for weak inferior JC
anchors medial clavicle
Anterior lamina limit posterior movement fo the clavicle
posterior lamina limit anterior movement of clavicle
Functions of coracoclavicular ligament
Conoid fibres - limits forwards movements of the scapula (protraction)
Trapezoid fibres - limit backwards movement of the scapula (retraction)
anchors the clavicle medially
Both band limit elevation of clavicle
