صفحه محصول - پاورپوینت شانه

پاورپوینت شانه (pptx) 26 اسلاید

دسته بندی : پاورپوینت

نوع فایل : PowerPoint (.pptx) ( قابل ویرایش و آماده پرینت )

تعداد اسلاید: 26 اسلاید

قسمتی از متن PowerPoint (.pptx) :

The Shoulder = glenohumeral jt The glenohumeral joint is a ball-and-socket joint that allows for the arm to move in a circular rotation as well as movement of the arm towards and away from the body. The motion that the glenohumeral joint provides is flexion, extension, abduction and adduction. In Anatomical Position, the head of the humerus is medial, slightly posterior and superior in the glenoid fossa. While the glenoid cavity faces laterally forward and superior. Acromioclavicular Joint (AC joint) a gliding joint within the shoulder. This joint is specific to primates and humans, allowing for the ability to raise the arm above the head. This joint functions as a pivot point, acting like a strut to help with movement of the scapula resulting in a greater degree of arm rotation. Also, the AV joint allows for the transmission of force from the upper arm to the rest of the skeleton The AV joint is formed between the clavicle and the scapula. The acromion, a section of the scapula, is the binding site for the clavicle. These two bones fit together, but are not stable on their own. Ligaments & muscles are used to stabilize the AV joint. Two sets of muscles are important for the stabilization of this joint in the proper joint formation. [ help stabilize the clavicle and the scapula] 1) the trapezius: The upper trapezius muscle fibers connects the lower base of the skull to the clavicle. The middle and lower trapezius muscle fibers connect vertebrae in the spine to the scapula. 2) the deltoid: The anterior deltoid connects the clavicle to the humerus, while the posterior and lateral deltoid fibers connect the scapula to the humerus. Trapezius Large superficial, flat triangular muscle of upper back. Originates on the occipital bone of skull, ligamentum nuchae and 7 cervical and all thoracic vertebrae and inserts onto the clavicle, acromion and spine of the scapula.  Because the fibers run in different directions, it has a variety of actions. Different fibers control different actions: The superior (upper) fibers elevate the scapula: scapular elevation (shrugging up), the middle fibers retract it: scapular adduction (drawing the shoulder blades together) The inferior (lower) fibers depress it: depression (pulling the shoulder blades down) When the superior and inferior fibers act together they superiorly (upwardly) rotate the scapula. Deltoids forms the rounded contour of the human shoulder. Origin It arises in three distinct sets of fibers Anterior fibers: from the anterior border and upper surface of the lateral third of the clavicle Middle fibers: from the lateral margin and upper surface of the acromion. Posterior fibers: from the lower lip of the posterior border of the spine of the scapula, as far back as the triangular surface at its medial end Insertion All the fibers converge, the middle passing vertically, the anterior obliquely backward and lateralward, the posterior obliquely forward and lateralward; they unite in a thick tendon, which is inserted into the V-shaped deltoid tubercle on the middle of the lateral aspect of the shaft of the humerus.