deltoid muscle

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deltoid muscle

The athlete flexes his deltoid muscle in the mirror.

Definition
  1. Noun:
    • A large triangular muscle covering the shoulder joint: The deltoid muscle is a thick, triangular muscle that forms the rounded contour of the human shoulder.
    • A muscle serving to move the arm: Its primary functions are to abduct (lift away from the body), flex (lift forward), extend (pull backward), and rotate the arm at the shoulder joint.
Usage Examples
  • Noun:
    • Athletes often strengthen their deltoid muscle to improve shoulder stability.
    • The injection was administered into the deltoid muscle.
    • Pain in the deltoid muscle can limit arm movement.
Advanced Usage
  • "Deltoid" as a standalone noun: In medical, anatomical, and fitness contexts, "deltoid" is commonly used alone to refer to the deltoid muscle.
    • The anterior deltoid is responsible for flexion of the arm.
  • Referring to parts: The muscle is often described in three parts: the anterior (front), lateral (middle), and posterior (rear) deltoid.
Variants and Related Words
  • Deltoid (adj. & n.):
    • As an adjective: Having a triangular shape. The deltoid leaf.
    • As a noun: A shorthand for the deltoid muscle. He worked on his deltoids at the gym.
  • Deltoideus: A less common technical synonym for the deltoid muscle.
Synonyms
  • Deltoid (noun): The most direct synonym when referring to the muscle.
  • Shoulder muscle: A general descriptive term, though it is less specific as other muscles also act on the shoulder.
Related Phrases
  • Deltoid ligament: A separate anatomical term referring to a strong, triangular ligament in the ankle. This is a different structure but shares the name due to its triangular shape.
  • Deltoid tuberosity: The rough, V-shaped area on the humerus (upper arm bone) where the deltoid muscle attaches.
Notes
  • The deltoid muscle is crucial for a wide range of arm motions and is a key muscle in many sports and physical activities.
  • Injuries to this muscle, such as strains or tears, are common in activities involving overhead motion.
deltoid muscle

The athlete flexes his deltoid muscle in the mirror.

Noun
  1. a large triangular muscle covering the shoulder joint and serving to abduct and flex and extend and rotate the arm

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