Shoulder Girdle

Description

View of the shoulder girlde

Human shoulder girdle movements

Left panel shows a sagittal T1-weighted MR-arthrography image of the right shoulder of a thirty-five-year-old male, and depicts the anatomy of the shoulder girdle muscles on the level of the glenoid cavity: supraspinatus (A), infraspinatus (B), teres minor (C), subscapularis (D), deltoid (E), trapezius (F), triceps brachii (G) and teres major (H). Right panel illustrates one of the two positions where the cross-sectional area (CSA) of the rotator cuff muscles was measured

Name

• Shoulder Girdle
• Pectoral Girdle

General

• Incomplete bony ring that connects the upper limbs to the bones to the axial skeleton
• Formed by the clavicle and scapula on the sides of the body
• Anteriorly, joined by the manubrium and sternum
• The bones articulate with each other to form 4 joints

Joints

• Glenohumeral Joint: glenoid cavity of the scapula + head of the humerus
• Acromioclavicular Joint: acromion of the scapula + distal clavicle
• Scapulothoracic Joint: anterior body of scapula + posterior thorax
• Sternoclavicular Joint: superolateral sternum + medial clavicle

Vascular Supply

• Suprascapular and thoracoacromial arteries (acromioclavicular joint)
• Internal thoracic and suprascapular arteries (sternoclavicular joint)
• Anterior and posterior circumflex humeral arteries (glenohumeral joint)

Innervation

• Acromioclavicular joint: subscapular nerve, lateral pectoral nerve, axillary nerve
• Sternoclavicular joint: medial suprascapular nerve
• Glenohumeral Joint: axillary nerve, suprascapular nerve, lateral pectoral nerves

Function

• Forms a connection between upper limbs and thoracic cage;
• Facilitates movements of the upper limb in the glenohumeral joint

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Clinical Significance

• Needs to be updated

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See Also

• Shoulder Pain Main
• Physical Exam Shoulder
• Shoulder Anatomy Main

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