Deltoideuslihakseen

Deltoideuslihakseen is the Latin term for the deltoid muscle, a large, triangular muscle covering the shoulder joint. It is responsible for a variety of arm movements and provides the rounded contour of the shoulder. The deltoid muscle is divided into three distinct parts: the anterior, lateral, and posterior heads. Each head originates from a different part of the scapula and clavicle and inserts onto the deltoid tuberosity of the humerus. The anterior deltoid originates from the clavicle and is primarily involved in flexing and internally rotating the arm. The lateral deltoid arises from the acromion and is the main muscle responsible for abducting the arm away from the body. The posterior deltoid originates from the spine of the scapula and assists in extending and externally rotating the arm. Together, these three heads allow for a wide range of motion at the shoulder, including flexion, extension, abduction, adduction, rotation, and circumduction. The deltoid muscle is crucial for many everyday activities, such as reaching, lifting, and throwing, as well as in athletic performance across various sports. It is a common site for intramuscular injections due to its large size and accessibility.