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17 Cards in this Set
- Front
- Back
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What are two physiological joints of the shoulder arm complex? |
1) Subdeltoid 2) Scapulothoracic |
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What is the diarthrotic joint of the shoulder arm complex? |
Glenohumeral-scapulohumeral |
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What are two plane synovial joints of the shoulder arm complex? |
1) Acromioclavicular 2) Sternoclavicular |
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Which joint primarily influences the translatory movements of the mechanical scapulothroacic joint? |
The Sternoclavicular joint |
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What are the four ligaments of the sternoclavicular joint? |
1-2) Anterior/posterior sternoclavicular 3) Costoclavicular 4) Interclavicular |
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What are the functions of the four ligaments of the sternoclavicular joint? |
1-2) Anterior/posterior sternoclavicular: check posterior/anterior movements of the head of clavicle 3) Costoclavicular: checks elevation and limits protraction and retraction 4) Interclavicular: checks excessive downward movement of the clavicle |
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What direction in relation to their placement on a joint do ligaments limit movement? |
They limit movement opposite to their placement on a joint |
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What are the three ligaments of the acromioclavicular joint? |
Acromioclavicular, coracoclavicular, and coracromial |
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If torn, what is it called when the acromioclavicular (AC) joint is torn? |
Partial shoulder separation |
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If torn, what is it called when the coracoclavicular joint is torn? |
Complete shoulder separation |
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What is the least stable joint in the body? Why? |
The gleno-humeral joint. It sacrificed stability for mobility. |
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The total available articular surface of the glenoid fossa is enhanced by an accessory structure known as what? |
The glenoid labrum. |
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What are the most important bursae of the gleno-humeral joint? What do they do? |
The subacromial and subdeltoid bursae. These bursae separate the supraspinatus tendon and head of the humerus below, from the acromion, coracoacromial ligament and Deltoid muscle above. |
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What is the unique structure of the glenohumeral capsule that enables it to support the wide range of movement at this joint? |
It is taut superiorly but slack inferiorly. |
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Where is the coracoacromial arch and what is its function? |
The arch overlies the subacromial bursa. The acromion process, coracoacromial ligament and coracoid process form the arch. It serves to protect the humeral head from direct trauma. |
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Glenohumeral Ligament structure and function |
Three bands that form a Z on the anterior capsule. All bands tighten on lateral rotation; middle and inferior bands tighten during abduction. |
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Coracohumeral ligament |
Originates from coracoid process and blends with the superior capsule and the supraspinatus tendon to insert on the greater tubercle. It checks lateral rotation but serves a more important funciton in passive support of the upper limb against the force of gravity. |
