Deltoid

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Deltoid

The Deltoid (pronounced: /ˈdɛltɔɪd/) is a large, triangular muscle occupying the upper arm and the shoulder giving it a rounded shape. The term "deltoid" comes from the Greek letter Delta, which is shaped like an equilateral triangle.

Etymology

The term "deltoid" has been derived from the Greek word "δέλτα" (delta), and the English suffix "-oid", meaning "delta-shaped" or "triangular".

Anatomy

The deltoid muscle is divided into three parts:

  • The anterior or clavicular part
  • The middle or acromial part
  • The posterior or spinal part

Each part has its own function and contributes to the overall movement of the shoulder joint.

Function

The deltoid muscle, due to its location and size, is responsible for the majority of movements in the shoulder joint. It plays a crucial role in the abduction, flexion, and extension of the arm.

Related Terms

  • Abduction: The movement of a limb away from the midline of the body.
  • Flexion: The action of bending or the condition of being bent.
  • Extension: An action that increases the angle between the bones of a joint.
  • Muscle: A band or bundle of fibrous tissue in a human or animal body that has the ability to contract, producing movement in or maintaining the position of parts of the body.
  • Shoulder Joint: The shoulder joint, also known as the glenohumeral joint, is the major joint of the shoulder, but can more broadly include the acromioclavicular joint.

External links

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