18 Questions
What is the function of eyelids in relation to light and radiation?
Form a barrier to reduce the amount of light and other radiation entering the eye
What marks the boundary of the tarsal plate in the eyelids?
Grey-line
How do eyelids distribute tears over the ocular surface?
During blinking
Which of the following tissues is NOT part of the structures of the eyelids?
Striated muscle (orbicularis oculi)
Which part of the eyelid undergoes a change from keratinised epithelium to unkeratinised epithelium?
Tarsal plate
Where does the epidermis of the skin change to unkeratinised epithelium of conjunctiva in the eyelids?
At the tarsal gland orifices
What acts as a barrier to prevent the spread of orbital infections into the globe?
Intermuscular septa
Where is the epicanthal fold commonly found?
Oriental and Asian races
What marks the regions where the tissue of the eyelids is anchored to the facial bones?
Naso-jugal folds
What divides each eyelid into orbital and tarsal portions?
Palpebral sulcus
What creates the intraconal space by connecting the 4 recti muscles?
Intermuscular septa
What covers increasing amounts of the upper cornea as age increases?
Upper lid
Which part of the eyelids consists of a network of collagen & elastic fibers with numerous fine blood vessels & lymphatics?
Skin
Which element subdivides the orbit into compartments by containing fibroblasts?
Intermuscular septa
How are the eyelids separated from one another?
By palpebral sulcus
Which structure connects the periorbita to Tenon's capsule & intermuscular membranes?
Intermuscular septa
What is the function of the check ligament in relation to muscle action?
Prevents supraduction of the globe if septae become trapped
Which structure envelops the EOM and connects the muscle segments to each other?
Check ligament
Explore the key features of eyelid anatomy including lacrimal puncta, tarsal glands, mucocutaneous junction, and the grey-line boundary. Learn about the changes in the palpebral aperture position throughout life.
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