Sternum Flat Thin and curved Points of attachment for muscles protectors of

Sternum flat thin and curved points of attachment for

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Sternum Flat (Thin and curved) Points of attachment for muscles; protectors of internal organs. Helps protect the heart, lungs, and major blood vessels from injury. Articulates with sixteen bones: the paired clavicles and the first seven pairs of ribs via the costal cartilages, forming the front of the ribs. Costals (ribs) Flat (Thin and curved) Three important functions: protection, support and respiration. Encloses and protects the heart and lungs. Provides a strong framework onto which the muscles of the shoulder girdle, chest, upper abdomen and back can attach. It is flexible and can expand and contract by the The first rib articulates solely with the first thoracic vertebra. The head (of the rib) articulates with the demifacet and the tubercle articulates with the costal facet. The last three thoracic vertebrae lack transverse processes and the ribs associated with them lack tubercles.
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action of the muscles of respiration. Scapula (shoulder blade) Flat ( Thin and curved) To attach the upper arm to the thorax, or trunk of the body, stabilizes the arm and provides arm movement at the shoulder, it also connects the humerus bone of the arm to the collarbone. Has two main articulations: At the Glenohumeral joint between the glenoid fossa of the scapula and the head of the humerus. Acromioclavicular joint between the acromion of the scapula and the clavicle. Bones of the Arm: Humerus Long (Cylinder like shape, longer than it is wide) Provides support to the major muscles of the shoulder, upper and lower arm, very important in proper movement and functioning of the entire arm. Articulates with the glenoid fossa of the scapula. More distally, at the elbow, the capitulum of the humerus articulates with the head of the radius, and the trochlea of the humerus articulates with the trochlear notch of the ulna. Bones of the Forearm: Radius Ulna Long (Cylinder like shape, longer than it is wide) In concert with each other, the two bones play a vital role in how the forearm rotates . The ulna primarily connects with the humerus at the elbow joint, while the radius primarily junctions with the carpal bones of the hand at the wrist joint. Together with the radius , the ulna enables the wrist joint to rotate. The radius and ulna lie parallel from the elbow, where they articulate with the humerus, to the wrist, where they articulate with the carpals. The radius is located laterally, near the thumb, and the ulna medially, near the little finger. Carpals (wrists) Short (Cube- like shape, approximately equal in Main role of the wrist (carpals) is to facilitate effective positioning of the hand and powerful Bones of the forearms (radius and ulna) articulate with the carpals, where they articulate with the metacarpals.
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length, width, and thickness) use of the extensors and flexors of the forearm, and the mobility of individual carpal bones increase the freedom of movements at the wrist.
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