The shoulder girdle or pectoral girdle, composed of the clavicle and the scapula, connects the upper limb to the axial skeleton through the sternoclavicular joint (the only joint in the upper limb that directly articulates with the trunk), a ball and socket joint supported by the subclavius muscle which acts as a dynamic ligament. While this muscle prevents dislocation in the joint, strong forces tend to break the clavicle instead. The acromioclavicular joint, the joint between the acromion process on the scapula and the clavicle, is similarly strengthened by strong ligaments, especially the coracoclavicular ligament which prevents excessive lateral and medial movements. Between them these two joints allow a wide range of movements for the shoulder girdle, much because of the lack of a bone-to-bone contact between the scapula and the thoracic cage. The pelvic girdle is, in contrast, firmly fixed to the axial skeleton, which increases stability and load-bearing capabilities.
The mobility of the shoulder girdle is supported by a large number of muscles. The most important of these are muscular sheets rather than fusiform or strap-shaped muscles and they thus never act in isolation but with some fibres acting in coordination with fibres in other muscles.
- of shoulder girdle excluding the glenohumeral joint
- Migrated from head
- Trapezius, sternocleidomastoideus, omohyoideus
- Rhomboideus major, rhomboideus minor, levator scapulae
- Subclavius, pectoralis minor, serratus anterior
Other articles related to "girdle, shoulder girdle, shoulder":
... The pectoral girdle or shoulder girdle is the set of bones which connects the upper limb to the axial skeleton on each side ... and, in those species with three bones in the pectoral girdle, the coracoid ... In humans, the only true anatomical joints between the shoulder girdle and axial skeleton are the sternoclavicular joints on each side ...
... S40) Superficial injury of shoulder and upper arm (S41) Open wound of shoulder and upper arm (S42) Fracture of shoulder and upper arm (S42.0) Fracture of clavicle (S42.1) Fracture of scapula ...
Famous quotes containing the words girdle and/or shoulder:
“There are no stars to-night
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Yet how much room for memory there is
In the loose girdle of soft rain.”
—Hart Crane (18991932)
“Sir, tis my occupation to be plain:
I have seen better faces in my time
Than stands on any shoulder that I see
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—William Shakespeare (15641616)