OPT 114 -Orbit Overview UPDATED
ACTUAL Questions and CORRECT
Answers
What does the orbit socket contain? - CORRECT ANSWER - the globe, connective tissue,
extraocular muscles (EOMS), orbital nerves, blood vessels, and fat
What three coats (tunics) does the globe consist of? - CORRECT ANSWER - Outer
fibrous layer (cornea & sclera), middle vascular layer (iris, ciliary body, choroid), and inner
neural layer (retina)
What three chambers are filled with fluid in the globe? - CORRECT ANSWER - Anterior,
posterior, and vitreous
What is the sheet of dense connective tissue that covers the sclera? - CORRECT
ANSWER - Tenon's capsule (Bulbar fascia)
Describe the attachment of Tenon's capsule - CORRECT ANSWER - Anteriorly merges
with sclera/conjunctiva at the limbus. Posteriorly is continuous with the dural sheath of the optic
nerve.
What is the purpose of Tenon's capsule? - CORRECT ANSWER - -provides a strong
barrier
-separates the globe from contents of orbit
-prevents orbital infections from entering the globe
What is the transition between the cornea and tenon's capsule/sclera referred to? - CORRECT
ANSWER - limbus
Why is Tenon's capsule continuous with dura sheath posteriorly? - CORRECT ANSWER -
The optic nerve must pierce sclera and tenon's capsule to enter the globe
,Sheet of dense connective tissue that extends the entire rim of the orbit to the tarsal plate -
CORRECT ANSWER - Orbital septum (Palpebral fascia)
Describe the attachment of the orbital septum - CORRECT ANSWER - Continuous with
the periosteum at the superior and inferior orbital rim
What is the purpose of the orbital septum? - CORRECT ANSWER - Anterior barrier of the
orbit -separates the eyelids and lacrimal sac from the orbit and keeps the orbital fat in place
What does the orbital septum prevent from entering the orbit? - CORRECT ANSWER -
Facial/eyelid/nasolacrimal system infections
Rim where the orbital septum originates - CORRECT ANSWER - Arcus margins
Sheet of dense connective tissue that covers the bones of the orbit - CORRECT
ANSWER - periorbital (orbital fascia, periosteum)
Describe the attachment of periorbita - CORRECT ANSWER - anteriorly- continuous with
the periosteum of facial bones and orbital septum
posteriorly- continuous with dural sheath of the ON and forms the common tendinous ring
Transverse dense connective tissue located in the superior orbit and courses from lateral orbital
wall to medial orbital wall - CORRECT ANSWER - Whitnall's ligament
What is the function of Whitnall's ligament? - CORRECT ANSWER - Provides support
and maintains spatial movement between anatomic structures in the superior orbit
How is the Whitnall's Ligament formed? - CORRECT ANSWER - By condensation of the
levator muscle and is the point where the levator muscle fibers end and the levator aponeurosis
begins
, What is the function of levator aponeurosis? - CORRECT ANSWER - moves the eyelid
Transverse dense connective tissue located in the inferior orbit and courses from lateral orbital
wall to medial orbit wall - CORRECT ANSWER - Lockwood's Ligament
What is the function of Lockwood's Ligament? - CORRECT ANSWER - -provides
support and maintains spatial relationships between anatomic structures in the inferior orbit
-contributes to the formation of the capulopalpebral fascia
What is the function of the capulopalpebral fascia? - CORRECT ANSWER - dense
connective tissue that acts as a muscle to move the lower eyelid
Transverse dense connective tissue that is an expansion of the sheath of the medial rectus and
attaches to the lacrimal bone - CORRECT ANSWER - Medial check ligament
What is the function of medial check ligament? - CORRECT ANSWER - Prevents
overaction of the medial rectus
Transverse dense connective tissue that is an expansion of the sheath of the lateral rectus and
attaches to the zygomatic bone - CORRECT ANSWER - Lateral check ligament
What is the function of the lateral check ligament? - CORRECT ANSWER - prevents
overaction of the lateral rectus
Which ligaments come together to form the supporting hammock-like structure for the globe? -
CORRECT ANSWER - -Whitnall's
-Lockwood's
-Medial check
-Lateral check
ACTUAL Questions and CORRECT
Answers
What does the orbit socket contain? - CORRECT ANSWER - the globe, connective tissue,
extraocular muscles (EOMS), orbital nerves, blood vessels, and fat
What three coats (tunics) does the globe consist of? - CORRECT ANSWER - Outer
fibrous layer (cornea & sclera), middle vascular layer (iris, ciliary body, choroid), and inner
neural layer (retina)
What three chambers are filled with fluid in the globe? - CORRECT ANSWER - Anterior,
posterior, and vitreous
What is the sheet of dense connective tissue that covers the sclera? - CORRECT
ANSWER - Tenon's capsule (Bulbar fascia)
Describe the attachment of Tenon's capsule - CORRECT ANSWER - Anteriorly merges
with sclera/conjunctiva at the limbus. Posteriorly is continuous with the dural sheath of the optic
nerve.
What is the purpose of Tenon's capsule? - CORRECT ANSWER - -provides a strong
barrier
-separates the globe from contents of orbit
-prevents orbital infections from entering the globe
What is the transition between the cornea and tenon's capsule/sclera referred to? - CORRECT
ANSWER - limbus
Why is Tenon's capsule continuous with dura sheath posteriorly? - CORRECT ANSWER -
The optic nerve must pierce sclera and tenon's capsule to enter the globe
,Sheet of dense connective tissue that extends the entire rim of the orbit to the tarsal plate -
CORRECT ANSWER - Orbital septum (Palpebral fascia)
Describe the attachment of the orbital septum - CORRECT ANSWER - Continuous with
the periosteum at the superior and inferior orbital rim
What is the purpose of the orbital septum? - CORRECT ANSWER - Anterior barrier of the
orbit -separates the eyelids and lacrimal sac from the orbit and keeps the orbital fat in place
What does the orbital septum prevent from entering the orbit? - CORRECT ANSWER -
Facial/eyelid/nasolacrimal system infections
Rim where the orbital septum originates - CORRECT ANSWER - Arcus margins
Sheet of dense connective tissue that covers the bones of the orbit - CORRECT
ANSWER - periorbital (orbital fascia, periosteum)
Describe the attachment of periorbita - CORRECT ANSWER - anteriorly- continuous with
the periosteum of facial bones and orbital septum
posteriorly- continuous with dural sheath of the ON and forms the common tendinous ring
Transverse dense connective tissue located in the superior orbit and courses from lateral orbital
wall to medial orbital wall - CORRECT ANSWER - Whitnall's ligament
What is the function of Whitnall's ligament? - CORRECT ANSWER - Provides support
and maintains spatial movement between anatomic structures in the superior orbit
How is the Whitnall's Ligament formed? - CORRECT ANSWER - By condensation of the
levator muscle and is the point where the levator muscle fibers end and the levator aponeurosis
begins
, What is the function of levator aponeurosis? - CORRECT ANSWER - moves the eyelid
Transverse dense connective tissue located in the inferior orbit and courses from lateral orbital
wall to medial orbit wall - CORRECT ANSWER - Lockwood's Ligament
What is the function of Lockwood's Ligament? - CORRECT ANSWER - -provides
support and maintains spatial relationships between anatomic structures in the inferior orbit
-contributes to the formation of the capulopalpebral fascia
What is the function of the capulopalpebral fascia? - CORRECT ANSWER - dense
connective tissue that acts as a muscle to move the lower eyelid
Transverse dense connective tissue that is an expansion of the sheath of the medial rectus and
attaches to the lacrimal bone - CORRECT ANSWER - Medial check ligament
What is the function of medial check ligament? - CORRECT ANSWER - Prevents
overaction of the medial rectus
Transverse dense connective tissue that is an expansion of the sheath of the lateral rectus and
attaches to the zygomatic bone - CORRECT ANSWER - Lateral check ligament
What is the function of the lateral check ligament? - CORRECT ANSWER - prevents
overaction of the lateral rectus
Which ligaments come together to form the supporting hammock-like structure for the globe? -
CORRECT ANSWER - -Whitnall's
-Lockwood's
-Medial check
-Lateral check
