该 shoulder girdle is four bones, two neckline bones (clavicle) and two shoulder bones (肩胛骨). These four bones make up the shoulder support and additionally the shoulder attachment. The shoulder girdle in a perfect world swings from the head suspended over the rib confine without either the neckline bones or scapula touching the ribs.
该 shoulder girdle has just a single hard association with the storage compartment at the front of the chest the sternoclavicular joint where the neckline bones meet the sternum. At the back of the body, the shoulder bones are associated by the rhomboid muscles that extend from the external edge of the shoulder bone to the spine. 于是, the shoulder support is two sets of hard units-right scapula and clavicle and left scapula and clavicle rather than the apparently strong pelvis.
该 shoulder girdle is fundamentally like the pelvis yet practically unique. The shoulder girdle versatility in the arms versus the weight bolster capacity of the pelvis obscures their likenesses. Since it is lighter and bound in just a single place without firm help the shoulder support is more powerless against disfigurement than the pelvis. 也, being more remote from the beginning offers gravity more noteworthy use for demolition.
The shoulder is comprised of three bones the neckline bone, the shoulder bone, and the humerus, the arm bone. The bearing and nature of arms development are dictated by muscles that shape an extension amongst shoulder and humerus. On the off chance that pectoralis major is too tight the leader of the humerus will be turned in. On the off chance that the latissimus dorsi is tight the humerus will be pivoted inside. Teres major likewise has a part in deciding the arms development potential.
The shoulder girdle is intended to take into account free development of the arm and shoulder on the grounds that in standing the upper arm is never again engaged with weight bearing. Therefore its strength has been relinquished for a more prominent scope of movement. While the hips attachment is a strong container for the leader of the femur to sit into, the shoulder attachment is just a free structure framed by the acromial and coracoid procedures of the shoulder bone.
The arm and shoulder are loose to the point that a peculiar thing happens to consider the majority of the accessible scope of movement. Ligaments of specific muscles go up against the part of tendons that would be excessively solid and tight, making it impossible to empower to the extreme flexibility that the shoulder permits. This area of the arm and shoulder muscles is known as the rotator sleeve which I’ll clarify in a later post.
To a specific degree the shoulder girdle, 背部上方, and neck shape a solitary development framework. They all equally impact the majority of alternate components of the body.
Joints of The Shoulder Girdle
The shoulder and arm bone are combined by tendons. The joints enable the shoulder to move your arm here and there, it hovers, in front, and toward the back. You may think about the shoulder as one joint, 然而, there are three in the pectoral support: Sternoclavicular, 肩锁, and Glenohumeral.
The Sternoclavicular joint is molded by the verbalization of the stern with the manubrium of the sternum end of the clavicle. It’s a strong joint; it allows adaptability of the pectoral help.
The Sternclavicular joint is a synovial joint that has an articular circle and is encompassed by the joint case. ss
- Foremost and back Sternclavicular tendons: These tendons strengthen the joint in the front and back.
- Interclavicular肌腱: This tendon keeps running between the sterna finishes of the two clavicles over the highest points of the joints.
- Costoclavicular tendon: This tendon connects the base of the sterna end of the clavicle to the first rib.
The acromioclavicular joint is a synovial joint formed by the clarification of the acromial end of the clavicle with the acromion of the scapula. The acromioclavicular joint empowers the scapula to turn on the clavicle.
The Glenohumeral joint joins the leader of the humerus to the glenoid pit. It’s a ball-and-attachment joint that takes into account an extensive variety of development for the arm.
Envision your arm hanging around your agreement with your elbow twisted (so your lower arm is parallel to the floor). On the off chance that you push your lower arm and hand toward the midline of your body, you’re medically turning your arm in the glenohumeral joint. On the off chance that you move your lower arm and pass out far from your body the other way, at that point you’re along the side turning the arm at the Glenohumeral joint.
The glenoid pit is fixed with a ring-molded bit of ligament called the labrum, which shapes a lip that enables the leader of the humerus to fit into the depression somewhat more safely.