NBEO Part 1 - Anatomy Exam Questions and
Answers with Verified Solutions | Latest
Updated 2026
Layers of the eyelid Skin
Subcutaneous areolar layer
Orbicularis layer
Submuscular areolar layer
Orbital septum
Posterior muscular system
Tarsal plate
Palpebral conjunctiva
Orbicularis muscle split into what 2 Orbital - forced closure of eyelids
portions? Palpebral - spontaneous/reflex blinking
What is another name for the Pars ciliaris
muscle
of Riolan?
What is the function of the muscle Keeps lid margin tightly applied to the
of globe
Riolan? during eye movements
Rotates the lashes
Where is the gray line found? The most anterior portion of the muscle of
Riolan
, What is the importance of the gray It is a groove located between the eyelash
line? insertions and the meibomian glands
Divides the lid into anterior and posterior
portions
Surgical landmark during lid repair
Ectropion occurs due to paralysis Orbicularis
of
what muscle
What is another name for the Pars lacrimalis
muscle
of Horner?
What is the function of the muscle Encircles the canaliculi and helps drain
of tears into
horner? the lacrimal sac
What is the purpose of the orbital Prevents fat from falling down onto the lid
septum? margins
Keeps infections localized to the anterior
portion
of the eyelid, away from the orbit
Does the orbital septum protect NO - the lacrimal sac is anterior to the
the attachment
lacrimal sac from infection? of the orbital septum to the posterior
lacrimal crest
Where is the insertion for the At the superior orbital septum
levator
aponeurosis?
Answers with Verified Solutions | Latest
Updated 2026
Layers of the eyelid Skin
Subcutaneous areolar layer
Orbicularis layer
Submuscular areolar layer
Orbital septum
Posterior muscular system
Tarsal plate
Palpebral conjunctiva
Orbicularis muscle split into what 2 Orbital - forced closure of eyelids
portions? Palpebral - spontaneous/reflex blinking
What is another name for the Pars ciliaris
muscle
of Riolan?
What is the function of the muscle Keeps lid margin tightly applied to the
of globe
Riolan? during eye movements
Rotates the lashes
Where is the gray line found? The most anterior portion of the muscle of
Riolan
, What is the importance of the gray It is a groove located between the eyelash
line? insertions and the meibomian glands
Divides the lid into anterior and posterior
portions
Surgical landmark during lid repair
Ectropion occurs due to paralysis Orbicularis
of
what muscle
What is another name for the Pars lacrimalis
muscle
of Horner?
What is the function of the muscle Encircles the canaliculi and helps drain
of tears into
horner? the lacrimal sac
What is the purpose of the orbital Prevents fat from falling down onto the lid
septum? margins
Keeps infections localized to the anterior
portion
of the eyelid, away from the orbit
Does the orbital septum protect NO - the lacrimal sac is anterior to the
the attachment
lacrimal sac from infection? of the orbital septum to the posterior
lacrimal crest
Where is the insertion for the At the superior orbital septum
levator
aponeurosis?
