It arises from the humerus to later insert on the olecranon of the ulna. There is a distinct gap between it and the radius, which is filled by the pronator quadratus muscle. Attachments: Originates from the anterior surface of the ulna and attaches to the anterior surface of the radius. The biceps brachii originates on the front of the scapula of the shoulder and inserts on the front of the radius in the forearm. The fracture line on the volar cortex is usually simple, which facilitates reduction. These reactions change the internal structures of muscle fiber cells, a process that shortens the muscle. The surgical neck is a common site for fractures (hence its name), while fractures of the anatomical neck are rare.. The stability of the elbow joint is maintained by the bony congruency, the muscular attachments and the ligaments. Gross anatomy Osteology. A square shaped muscle found deep to the tendons of the FDP and FPL. This complex system allows a hinging action (bending and straightening) and a rotation action. the proximal end lies medial and the distal end lateral to the radius. Muscles contract when messages travel from nerves to muscles and trigger chemical reactions. Radius . The ulna shaft tapers distally, lying oblique to the radius, i.e. The anterior scalene muscle lies on the lateral aspect of the neck, deep to the prominent sternocleidomastoid muscle. The and the radius (the smaller bone of the forearm on the thumb side). Actions: Pronates the forearm. Attachments: Originates from the anterior tubercles of the transverse processes of C3-C6, and attaches onto the scalene tubercle, on the inner border of the first rib. Function: Articulates with the radius and the ulna of each arm, forms part of the elbow, provides attachments for several shoulder and arm muscles. Anconeus Muscle – Attachments, Action & Innervation. The humerus begins proximally as a rounded head and joins the greater and lesser tubercles via the anatomical neck of the humerus. M. pronator quadratus: The fibers of this muscle originate from the proximal radius and ulna and are inserted into the distal third of the radius. Radius. Muscles contract and relax to move bones. Innervation: Median nerve (anterior interosseous branch). The surgical neck is found just inferior to the tubercles where the shaft begins. • M. supinator longus: This muscle finds it origin at the lateral epicondylar crest of the humerus and is inserted into the base of the styloid process of the radius. Elevating the Pronator Quadratus Use a periosteal elevator to elevate the PQ to expose the volar surface of the radius (Figure 7). The radius (r, l) is a long, thin bone of the forearm (antebrachium)—a segment of the upper limb of the appendicular skeleton. on the lateral edge of the radius (Figure 6). 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