MRI Essay Example | Topics and Well Written Essays - 1500 words

MRI - Essay Example Apart from these condyles, which are bony prominences, the distal end of humerus has two depressions as well. The bony depression on the anterior side is known as coronoid fossa, while the posterior depression is known as olecranon fossa. The areas where the bones connect to each other are referred to as articular surfaces. The elbow joint is articulated at Radioulner, Radiohumeral and Ulnohumeral joints. These articular surfaces are covered by the hyaline cartilage. A joint capsule, which is lined by Synovial membrane, encloses the entire joint in such a way that all three joint cavities remain in communication with each other. The elbow joint is stabilized by ligaments. These include Radial and Ulnar Collateral ligaments and the annular ligament of the head of radius. The medial side of the joint is strengthened by the Ulnar collateral ligament whereas the radial collateral ligament stabilizes the lateral side. The head of radius is connected to the radial notch of ulna by the annu lar ligament which runs around the head of radius. The movements at the elbow joint are facilitated by the muscles attached in this region. These muscles are organized into four different compartments according to their position, namely anterior, posterior, lateral and medial. The anterior group has two muscles, biceps brachii and brachialis. Posterior group has triceps brachii and anconeus muscles. The lateral group has brachioradialis and supinator muscles as well as the extensors of wrist and fingers. Whereas the flexor muscles of wrist and fingers, along with pronator teres muscle form the part of medial group. The arterial blood supply to the elbow region is through brachial artery. The venous drainage is by the way of brachial vein, median vein and median cubital vein. The nerves supplying the elbow region include musculocutaneous nerve, radial nerve, ulnar nerve and axillary nerve. MRI IMAGE FOE ELBOW The daily activities performed by the hands, grasping and the coordinated m ovements at the forearm and wrist are possible because of the complex synovial joint at the elbow which is referred to as the elbow joint (Lee et al 2003). It connects the distal end of the upper arm bone humerus to the proximal ends of the two forearm bones radius and ulna. The bones are articulated at trochlea and capitulum of humerus above and trochlear notch of ulna and the head of the radius below (Snell 2004). The three bones are articulated at four joints, together known as cubital articulations, i.e, humeroulner, humeroradial, superior radioulner and inferior radioulner (Stroyan et al 1993). The articular surfaces are covered by hyaline cartilage and the joint is enclosed by the capsule, lined by synovial membrane. The capsule serves to stabilize the joint along with the two ligaments, i.e. lateral collateral ligament and the ulnar collateral ligament. Anteriorly, the capsule attaches to the radial and coronoid fossae and the medial and lateral epicondyles of humerus above a nd to the coronoid process of ulna and annular ligament of radius head below. The posterior attachments of capsule are to the olecranon processes of humerus above and ulna below, and the annular ligament of radius head below (Snell 2004). The fan shaped lateral collateral ligament attaches lateral epicondyle of humerus to the annular ligament of radius. The triangular ulnar collateral