Topics

Topic

design image
Inferior eyelid

The inferior eyelid, commonly known as the lower eyelid, forms the lower margin of the palpebral fissure and plays a crucial role in protecting the anterior surface of the eye. It functions alongside the superior eyelid, maintaining ocular hydration, clearing debris, and serving as a barrier against external trauma. The inferior eyelid is composed of several anatomical layers, including skin, subcutaneous tissue, orbicularis oculi muscle, tarsal plate, and conjunctiva. Its position and integrity are vital for normal tear distribution and ocular surface health.

Synonyms

  • Lower eyelid

  • Palpebra inferioris

  • Inferior palpebra

  • Inferior lid

Function

  • Protects the eyeball from physical injury and foreign bodies

  • Aids in spreading the tear film evenly across the ocular surface

  • Prevents excessive evaporation of the tear film

  • Facilitates drainage of tears via the inferior lacrimal punctum

  • Helps in the mechanical removal of debris through blinking

MRI Appearance

T1-Weighted Images

  • The inferior eyelid appears as a multi-layered structure:

    • Skin and subcutaneous fat: intermediate to high signal intensity.

    • Orbicularis oculi muscle: intermediate signal.

    • Tarsal plate: low signal intensity (due to dense connective tissue).

    • Glands: Meibomian glands may show slightly higher signal than muscle.

  • Clear distinction of layers is possible in high-resolution images.

T2-Weighted Images

  • Skin and muscle: intermediate signal.

  • Tarsal plate: low signal intensity.

  • Fatty tissue: high signal.

  • Glands: relatively high signal intensity due to fluid content.

  • Layers may appear more prominent due to contrast between fat and fibrous tissues.

STIR (Short Tau Inversion Recovery)

  • Fat: markedly suppressed signal (appears dark).

  • Muscle and tarsal plate: low to intermediate signal.

  • Edematous changes: hyperintense if present, aiding in detection of inflammation or pathology.

CT Appearance

  • Skin and subcutaneous tissues: low attenuation (less dense).

  • Tarsal plate: higher attenuation compared to muscle/fat (appears denser).

MRI images

Inferior eyelid mri image