Definition

1. Noun:
   • A muscle that produces supination: A muscle, particularly one located in the forearm, whose primary function is to rotate the forearm and hand so that the palm faces upward or forward. This action is called supination.

Examples of Usage

• Noun:
  • The supinator is a key muscle for turning a doorknob.
  • Damage to the radial nerve can weaken the supinator.
  • The physical therapist assessed the strength of my supinator after the injury.

Advanced Usage

• Anatomical Context: In detailed anatomical descriptions, the supinator is often discussed in relation to its origin (lateral epicondyle of the humerus and ulna) and its insertion (radius), and its innervation by the deep branch of the radial nerve.
  • The supinator muscle lies deep to the superficial extensor muscles of the forearm.

Variants and Related Words

• Supinate (verb): To rotate the forearm and hand so the palm faces upward or forward.
  • You must supinate your forearm to receive the change in your palm.
• Supination (noun): The rotational movement produced by the supinator muscle.
  • Supination is the opposite motion of pronation.

Synonyms

• None (Anatomical Term): As a specific anatomical structure, "supinator" does not have direct synonyms. It can be described functionally as a forearm supinating muscle.

Related Phrases

• Supinator syndrome: A condition involving compression of the deep branch of the radial nerve as it passes through the supinator muscle.
  • The patient's wrist weakness was diagnosed as supinator syndrome.

Related Idioms

• None: This is a technical anatomical term and is not used in idiomatic expressions.

Noun

1. a muscle (especially in the forearm) that produces or assists in supination