Upper Limbs and Thorax Essay Example

latissimus dorsi and teres major in extending and laterally rotating the arm.

The powerful abductor function of the multivariate middle part allows for arm abduction of up to 900, which is initiated by supraspinatus. During abduction, both the anterior and posterior fibers serve to stabilize the humerus. The serratus anterior muscle connects the medial border of the scapula to the lateral thoracic wall. It originates from eight fleshy attachments on the outer surfaces and superior borders of the first eight ribs. The muscle belly covers a significant portion of the lateral thoracic wall.

The first digitization reaches the superior angle of the scapula, while the next two or three attachments spread out to insert on the medial border of the scapula. The lower four or five attachments converge towards the lower angle of the scapula. The insertion occurs along a strip along the costal surface of the medial border of the scapula from the superior angle to infer 'or angle. The lower four or five attachments are inserted on a broad area on the costal surface of infer error angle.Nerve Supply: The long thoracic nerve (CO, CO, CO) has the role of protracting the scapula and is involved in pushing and punching movements. The lower portion of the muscle, along with the lower part of the trapezium, aids in rotating the wing of the scapula during arm abduction above the head.

Clinical Anatomy: If the muscle becomes paralyzed, scapular protraction is weakened and the medial border of the scapula becomes prominent (known as winging of the scapula).

The Triceps Brachii: This muscle originates from three heads. The long head arises from the infraglenoid tubercle of the scapula. The

lateral head attaches to a narrow oblique ridge on the posterior surface of the upper part of the humerus shaft. The medial head attaches to the entire posterior surface of the humerus distal to the spiral groove. It is also connected to the back of the lateral intermuscular septum.

Muscle Belly: The lateral and long heads overlap the medial head, which lies on a deeper plane. The three heads unite to form a common tendon.

Insertion: The triceps tendon inserts on the superior surface of the olecranon, separated from the articular capsule by a bursa.

Nerve Supply: The triceps receives separate branches from the radial nerve.

Actions: The triceps main function is extending the elbow. The long head also provides support to the shoulder joint when the arm is raised.

Large, fusion muscle belly with two heads of origin. The short head originates from the tip of the cordial along with coral-brachia and the long head originates from the supercargoes tubercle inside the capsule of the shoulder joint. It inserts as a flat tendon to the rough posterior part of the radial tuberose's and gives a broad expansion medially. This tendon blends with the deep fascia of the forearm. It is supplied by separate branches for the two heads and its main actions are to powerfully aspirate the flexed elbow and help flex the elbow.

The long head also helps prevent upward displacement of the humeral head. The muscle belly crosses the upper part of the forearm and forms a flat tendon. The humeral head inserts on the medial epicycle of the humerus and the lunar head (smaller) inserts on the medial border of the corrosion process of the

ulna. It is supplied by the median nerve and its main actions include being an important pronto muscle of the forearm and a weak flexor of the elbow joint.

The ingot, which consists of multiple heads, includes the honeymooner head that originates from the medial epicycle of the humerus and also from a tubercle on the medial border of the corrosion process of the ulna. The radial head originates from the anterior border of the radius, starting at tuberose's and extending to its insertion on a rough area on the middle of the lateral surface of the radius. It is supplied by the median nerve and its main action is to serve as a floor distributor propound.

The four tendons course towards the wrist, forming two layers - two superficial tendons for the middle and ring fingers, and two deep tendons for the index and little fingers. Each tendon splits into two slips at the anthropomorphically joint and forms a tunnel through which the tendon of the floor distributor propounds passes.

The text below describes the insertion and nerve supply of the slips in the middle phalanx. The median nerve provides the nerve supply to the fleshy part of the muscle. Its actions include flexing the proximal interpersonal joints of the four fingers. The muscle belly is located deep to the superficial distributor floor, giving rise to four tendons that pass beneath the reticulum of the wrist. The upper three fourths of the anterior and medial surfaces of the ulna, as well as the front of the interior souse membrane of the forearm, receive innervation. The four tendons are inserted into the base of the distal

phalanx by passing through the TU Nell formed by slips of tendon from the superficial distributor floor.