PEDS100 Chapter Notes -Glenohumeral Ligaments, Glenoid Labrum, Coracohumeral Ligament

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Published on 25 Nov 2011
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Shoulder Joint (Glenohumeral joint):
loose, shallow joint, allows greatest range of motion of any joint in body
ball and socket joint formed by head of humerus with glenoid cavity of scapula
Stability is mostly provided by ligaments, and surrounding skeletal muscles and
their associated tendons
Glenoid labrum: connected to margin of glenoid cavity by fibrous cartilage,
which deepens the joint. ring of dense, irregular connective tissue. serves as
attachment site for glenohumeral ligaments and long head of biceps brachii
articular capsule extends from scapular neck to humerus, oversized, weakest at
inferior surface.
when in anatomical position capsule is tight superiorly, loose inferiorly and
anteriorly
Ligaments:
Glenohumeral ligaments: anterior regions where capsule surrounding shoulder
thickens. Superior, middle/inferior blend together. participates in joint stabilization
only as humerus approaches or exceeds limits of normal motion
Coracohumeral ligament: originates at base of coracoid process and inserts
on head of humerus. strengthens superior part of articular capsule, helps support
weight of upper limb
Coracoacromial ligament: spans gap between coracoid process and acromion,
just superior to capsule. provides additional support to superior surface of
capsule
Acromioclavicular ligament: binds acromion to clavicle, restricts clavicular
movement at acromial end.
Shoulder separation is common injury involving partial or complete dislocation of
acromioclavicular joint, can result from blow to superior surface of shoulder,
acromion is forcibly depressed, clavicle held back by strong muscles
Coracoclavicular ligaments: tie clavicle to coracoid process, limit relative
motion between clavicle and scapula
Transverse humeral ligament: extends between greater and lesser tubercles,
holds down tendon of long head of biceps brachii muscle in intertubercular
groove of humerus
Muscles:
Muscles that move humerus stabilize glenohumeral joint more than all ligaments
and capsular fibers combined.
Rotator cuff: muscles that support shoulder, limit its movement range
Bursae:
reduce friction where large muscles and tendons pass across joint capsule
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Document Summary

Ligaments: glenohumeral ligaments: anterior regions where capsule surrounding shoulder thickens. Muscles: muscles that move humerus stabilize glenohumeral joint more than all ligaments and capsular fibers combined, rotator cuff: muscles that support shoulder, limit its movement range. Humerus: proximal bone of upper limb, head: smooth, round, superior medial portion of proximal epiphysis. Articulates with the scapula at the glenoid cavity: greater tubercle: large projection on the lateral edge of the epiphysis. 3 flat smooth impressions where muscles originating from the scapula attach. Supraspinatus muscle inserts on the uppermost impression, the infraspinatus muscle onto the middle, and the teres minor muscle attaches to the lowest: lesser tubercle: on anterior and medial surface of the epiphysis. Where subscapularis attaches: intertubercular sulcus(intertubercular groove): separates the greater and lesser tubercle, anatomical neck: constriction inferior to the head, marks distal limit of articular capsule of shoulder joint.

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