Definition

1. Noun:
   • The medial rectus: A specific extraocular muscle of the eye. Its primary function is to pull the eyeball inward, toward the nose, enabling the eye to look toward the midline of the body. It is one of the six muscles responsible for controlling eye movements.

Usage

• The term "medial rectus" is used in medical, anatomical, and ophthalmological contexts to refer to this specific muscle. It is typically used with definite articles ("the medial rectus") or possessive determiners (e.g., "its medial rectus").

Examples

• Noun:
  • The surgeon carefully isolated the medial rectus during the strabismus operation.
  • Weakness in the medial rectus can cause the eye to turn outward, a condition known as exotropia.
  • The nerve signal to the medial rectus was impaired.

Advanced Usage

• "Medial rectus palsy": Paralysis or weakness of the medial rectus muscle.
  • The patient's double vision was diagnosed as a result of medial rectus palsy.
• "Medial rectus recession": A surgical procedure to weaken the medial rectus muscle by moving its attachment point backward on the eyeball.
  • The ophthalmologist recommended a medial rectus recession to correct the esotropia.

Variants and Related Words

• Medial rectus muscle: A fuller, more descriptive term for the same structure.
• Extraocular muscles: The group of six muscles that control eye movements, which includes the medial rectus, lateral rectus, superior rectus, inferior rectus, superior oblique, and inferior oblique.
• Lateral rectus: The antagonist muscle to the medial rectus; it pulls the eye outward, away from the nose.

Synonyms

• Internal rectus: An older or less common term for the same muscle.
• MR (muscle): A common abbreviation used in medical notes and diagrams.

Related Terms and Phrases

• Adduction: The movement of turning the eye inward toward the nose, which is the primary action of the medial rectus.
• Oculomotor nerve (Cranial Nerve III): The nerve that supplies and controls the medial rectus muscle (along with several other eye muscles).
• Convergence: The coordinated action of both medial rectus muscles to turn the eyes inward to focus on a nearby object.

Noun

1. the ocular muscle whose contraction turns the eyeball medially