Contents of the Orbit Flashcards
Another name for Tenon’s capsule
Bulbar fascia (globe/ connective tissue)
Is tenon’s capsule vascular or avascular
Tenon’s capsule is avascular. Although vessels travel through the layer, no capillaries are formed within.
What does tenon’s capsule cover
The sclera and extra ocular muscles as they insert into the sclera.
Anteriorly, tenon’s capsule merges with the ___ at the limbus
Sclera and conjunctiva
Posteriorly, tenon’s capsule is continuous with the ___ of the optic nerve
Dural sheath.
This provides a strong barrier and prevents the spread of disease from orbit to eyeball/globe.
Dural sheath
Dense connective tissue that protects the optic nerve as it exits the eye.
What structure of the eye prevents spread of disease from the orbit to the eyeball?
Tenon’s capsule.
Another name for orbital septum
Palpebral fascia
Another name for palpebral fascia
Orbital septum
Where does the orbital septum/palpebral fascia originate?
The arcus marginalis
What is the orbital septum/palpebral fascia?
Sheet of dense connective tissue that extends the entire rim of the orbit to the tarsal plate.
It is continuous with the periosteum at the super and inferior orbital rim.
Anterior barrier of the orbit (holds fat in)
Separates the eyelids and lacrimal sac from the orbit
What structure keeps orbital fat in place
Orbital septum/palpebral fascia
What structure is continuous with the periosteum at the super and inferior orbital rim
The orbital septum/palpebral fascia
What is the periosteum called when it is in the orbit
Periorbitum
peri
around
What is the periorbita (periosteum/orbital fascia) continuous with anteriorly and posteriorly?
Anteriorly- Continuous with the periosteum of the facial bones and the orbital septum
Posteriorly- Continuous with the dural stealth of the optic nerve and forms the common tendinous ring.
What forms the common tendinous ring?
The periorbita/perostium/orbital fascia
What muscle type is the periobrbita?
Smooth muscle innervated by the autonomic system.
What is Whitnall’s ligament and where is it located
Dense connective tissue that is located in the superior orbit. It courses from the lateral orbit wall to the medial orbit wall.
Role of Whitnall’s ligament
Provides support and maintains the spacial relationships between anatomic structures in the superior orbit.
What is Whitnall’s ligament formed by
Condensation of the elastic fibers in the anterior sheath of the levator muscle- point where the levator muscle fibers end and the levator aponeurosis begins.
Role of lockwood’s ligament
Dense connective tissue that provides support and maintains spatial relationships between anatomic structures in the inferior orbit.
What does Lockwood’s ligament contribute to the formation of
Capsulopalpebral fascia.
What is lockwood’s ligament similar to?
Whitnall’s ligament. Both span the anterior orbit from lateral to medial walls and support/maintain the spacial relationships between anatomic structures in the superior or inferior orbit. They are both dense connective tissues.
