Lecture 9 Upper Extremities.docx

Clavicle flattens out and widens at the lateral

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Clavicle flattens out and widens at the lateral portion Cylindrical along handle and then it spreads a bit after Becomes concave as Itapproaches Red circle = conoid tubercle on posterior inferior side, has a cone like shape Blue circle = triangular roughened space starting at conoid tubercle where the trapezoid ligament attaches more lateral Clavicle is S shaped, has a tendency to fracture at its transition point AC Joint Not particularly mobile Little bit of spinning and mobile Hold the shoulder girdle together to pivot off of SC joint Number 1 = Acromioclavicular ligament to hold them together, on top of the joint Number 2 = TRAPEZOID LIGAMENT, attachment on inferior and lateral surface of clavicle Number 3 = Conoid ligament a. In real life, the fibres for each ligament are continuous with one another Coracoclavicular ligaments
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Number 4 = coracoid to acromion, coracoacromion ligament, both features on scapula, creates a ridge between the two bony landmarks, makes a roof//ceiling over the head of the humerus Actions being limited Number 2 and 3 = limits upward movement of clavicle, superior motion of lateral clavicle o Also lim its acromion dropping away from clavicle, suspensory ligaments o ****Conoidtrapezoid stops lateral end of clavicle from going up AND stops acromion from falling away from clavicle
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  • Fall '18
  • Krista Madsen

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