What divides the posterior side of the scapula?
What divides the posterior side of the scapula?
Posteriorly, the scapula is divided into a supraspinous fossa and infraspinous fossa by the scapular spine. Anteriorly, on the costal surface, is the shallow subscapular fossa. Laterally is the glenoid fossa.
What is an incomplete girdle?
The shoulder girdle, also called the pectoral girdle, is an incomplete bony ring formed by the clavicle and scapula on each side of the body, joined anteriorly by the manubrium of the sternum.
Why is the pectoral girdle incomplete?
The pectoral girdle is an incomplete ring because it is open in the back between the… The medial ends of the clavicles areticulate with the what of the sternum? The lateral ends of the clavicles areticulate with the what of the scapulae? This is a bone that serves as a brace between the sternum and the scapula.
Why is the pectoral girdle not a true girdle?
The pectoral girdle is made up of two clavicles and two scapulae which are the anchors that attach the “appendicular” skeleton to the “axial” skeleton. There is only a single “true” anatomical joint between the pectoral girdle and the axial skeleton, and that is the sternoclavicular joint.
What is the St joint?
Description. The Scapulothoracic (ST) “joint” is not a true anatomic joint as it has none of the usual joint characteristics (union by fibrous, cartilaginous, or synovial tissues).
What is a pectoral girdle?
The shoulder, or pectoral, girdle is composed of the clavicles (collarbones) and the scapulae (shoulder blades). In humans the clavicles join the sternum (breastbone) medially and the scapulae laterally; the scapulae, however, are joined to the trunk only by muscles.
What are the joints of the shoulder girdle?
The shoulder girdle is composed of the clavicle and the scapula, which articulates with the proximal humerus of the upper limb. Four joints are present in the shoulder: the sternoclavicular (SC), acromioclavicular (AC), and scapulothoracic joints, and glenohumeral joint.
Which joint is the articulation between the scapula and the humerus?
Glenohumeral joint
The shoulder joint itself known as the Glenohumeral joint, (is a ball and socket articulation between the head of the humerus and the glenoid cavity of the scapula)
What type of joint is the clavicle and scapula articulation?
The AC Joint is formed by the junction of the lateral clavicle and the acromion process of the scapula and is a gliding, or plane style synovial joint. The AC Joint attaches the scapula to the clavicle and serves as the main articulation that suspends the upper extremity from the trunk.
What is the scapular joint?
Anatomy. Your shoulder joint is a ball-and-socket joint. The head of the humerus (upper arm bone) is the ball and the scapula (shoulder blade) forms the socket where the humerus sits. The scapula and arm are connected to the body by multiple muscle and ligament attachments.