The shoulder girdle is likewise called the pectoral girdle, and also it is a bone ring, incomplete posteriorly. The shoulder girdle is developed by 2 sets the bones: the scapulae, posteriorly, the clavicles anteriorly and completed anteriorly by the manubrium that the sternum (part of the axial skeleton).
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Those skeleton are component of the appendicular skeleton - consisting bones of the four (upper and lower) and most that the bones forming the girdles (pectoral and pelvic). These bones affix the arms on each side, and the girdle actually features as the anchor the attaches the appendages come the axial skeleton.
| Function | Connecting the upper limbs come the axial skeleton |
| Bones | Scapulae, clavicles, manubrium of the sternum |
| Joints | Acromioclavicular - in between the acromion that the scapula and also the lateral finish of the clavicleSternoclavicular - in between the manubrium of the sternum and the first costal cartilage through the medial finish of the clavicleGlenohumeral - in between the head of the humerus and the glenoid fossa of the scapula |
| Vascularization | Suprascapular and also thoracoacromial arteries (acromioclavicular joint)Internal thoracic and suprascapular arteries (sternoclavicular joint)Anterior and posterior circumflex humeral arteries (glenohumeral joint) |
| Innervation | Subscapular, lateral pectoral, axillary nerves (acromioclavicular joint)Medial suprascapular nerve (sternoclavicular joint)Axillary, suprascapular, lateral pectoral nerves (glenohumeral joint) |
| Clinical relations | Fractures, dislocations the the joints, glenoid labrum tears, adhesive capsulitis that the glenohumeral joint |
All of the bones that make the shoulder girdle will be debated in this article.
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The pectoral girdle associate the top limb to the axial skeleton ~ above the left and also right political parties of the body. It creates the complying with joints:
Sternoclavicular joint
Articulatio sternoclavicularis
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Note that the clavicle & scapula provides up the shoulder girdle, if the left & best pelvic skeletal (hip bones) and also the sacrum and also coccyx form the pelvic girdle. The pectoral girdle and also bones of the complimentary part that the top limb kind the exceptional appendicular skeleton, while the pelvic girdle and bones of the complimentary part the the lower limb type the worse appendicular skeleton.
Movements
The pectoral girdle is an extremely mobile. However, the complying with movements the the girdle are greatly permitted through the physiological joint between the pectoral girdle and also the rib cage, the scapulothoracic joint. The movements easily accessible for the pectoral girdle or the scapula in certain includes:
Retraction: this motion pulls the scapula back towards the rib cage.Depression: the reverse of the elevation movement. The pectoral girdle and entire shoulder move downwards.Downward rotation: rotating the lower scapula in the direction of the rib cage as in relocating the eight behind the back.Want come learn more about the species of human body movements? examine out our articles, video tutorials, quizzes, and also labeled diagrams.
Bones
The shoulder girdle is created by 2 pairs the bones, the scapulae and also the clavicles.
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Clavicle
The clavicle or collar bone is an S-shaped lengthy bone lied superficial and also is palpable along its whole length (figure 3). That connects the top limb come the trunk.