The compounds of the bones of the upper limb girdle
The compounds in the belt of the upper limb are represented by two paired articular compounds - compound thoracic end of the clavicle with the sternum and the connection handle acromial end of the clavicle with the acromion scapulae.
Sternal clavicular joint, (articulatio sternoclavicularis), a compound formed by the sternal end of the clavicle with the clavicular notch on the handle of the sternum - the only joint that connects the axial skeleton with the skeleton of the upper extremity. The shape of both articular surfaces close to the saddle. Powerful joint capsule reinforced midclavicular (lig. interclaviculare), costoclavicular (lig. costoclaviculare) (runs between the sternal end of clavicle and rib I), and anterior and posterior sternal-clavicular ligaments.
Cartilaginous articular disk located inside the joint, shared not coincide in the form of joint surfaces and slightly increases the degree of freedom of the connection. As a result of the sternum-clavicular joint allows movement in three planes: the vertical axis (the movement of the shoulders forward and backward), around the sagittal (raise and lower the shoulders), as well as around the frontal axis (rotation).
|In Fig. 23.
Sternum-clavicular joints, front view
1 - midclavicular ligament;
2 - the sternum-clavicular joint;
3 - BREAST end of the clavicle;
4 - costoclavicular ligament;
5 - I edge;
6 - anterior sternum-clavicular ligament;
7 - presternum
|In Fig. 24.
1 - acromial end of clavicle;
2 - acromioclavicular ligament;
3 - coracoid-clavicular ligament;
4 - acromion scapula;
5 - coracoid process;
6 - coracoid-acromion ligament
Acromioclavicular joint (articulatio acromioclavicularis) is flat in shape, with little freedom of movement. This form joint articular surface acromion scapula and acromial end of clavicle. Strengthened joint strong coracoid-clavicular (lig. coracoclaviculare) and acromioclavicular (lig. acromioclaviculare) ligaments.
a., aa. — arteria, arteriae (artery, the artery)
lig., ligg. — ligamentum, ligamenta (ligament, the ligaments)
m., mm. — musculus, musculi (muscle, the muscle)
n., nn. — nervus, nervi (nerve, the nerve)
r., rr. — ramus, rami (branch)
s. — seu (or)
v., vv. — vena, venae (vienna)