30 Questions
What forms the posterior part of the roof of the bony orbit?
Orbital plate of ethmoid
Which bone forms most of the floor of the orbit?
Maxilla
What part of the orbit lodges the orbital part of the lacrimal gland?
Anterolateral part of the roof
Which bone forms the anterior part of the medial wall of the bony orbit?
Orbital plate of ethmoid
Where does the nasolacrimal duct lodge within the orbit?
Vertical groove of the maxilla
Which bone forms the anterior part of the lateral wall of the bony orbit?
Zygomatic bone
Which structure forms the inferior fornix of conjunctiva when reflected from the eyeball?
Lower eyelid
What happens to the conjunctiva when the eyelids are closed?
It becomes a completely closed sac
Where does the lacrimal fluid (tears) secreted by the lacrimal apparatus lubricate and protect?
Cornea
Which part of the lacrimal gland lies in the lacrimal fossa in the anterolateral part of the roof of the orbit?
Orbital part
Where do the twelve ducts of the lacrimal gland open into?
Superior fornix of the conjunctiva
What is the initial opening of the lacrimal canaliculus called?
Lacrimal punctum
What is the action of the medial rectus muscle on the cornea?
Rotates the cornea medially
Where is the insertion point of the superior oblique muscle in relation to the eyeball?
Posterolateral superior quadrant
Which nerve supplies the inferior oblique muscle?
Inferior division of oculomotor nerve
In which quadrant of the eyeball does the inferior oblique muscle insert?
Postero-lateral inferior quadrant
Which muscle rotates the cornea superiomedially?
Superior rectus
What is the origin of the inferior oblique muscle?
Anterior medial part of floor of the orbit
What structure forms the lateral palpebral raphe?
Inferior tarsus in the lower eyelid
Which part of the eyelid is reduced to a single layer opposite the cornea?
Bulbar conjunctiva
What structure forms the medial palpebral ligament?
Superior tarsus
Which part of the eyelid lines the inner surface of the eyelids?
Palpebral conjunctiva
What is the structure that covers the eyeball and is reflected to form the superior fornix of conjunctiva?
Palpebral conjunctiva
What structure unites at the medial angle of the orbit to form the medial palpebral ligament?
Inferior tarsus
Which part of the nasolacrimal duct opens in the inferior meatus of the nose?
Nasolacrimal canal
What prevents entry of air from the nose into the lacrimal sac?
Hasner's valve
Why should the angular vein be avoided during incisions in the lacrimal sac?
Its injury results in severe bleeding
Which muscle originates from the roof of the orbit just above the optic canal?
Levator palpebrae superiosis
Which structure is formed by the fundus, body, and lower end in the lacrimal area anatomy?
Lacrimal sac
What happens in case of rhinitis or common cold related to the veins surrounding the nasolacrimal duct?
Obstruction of the duct
Test your knowledge on the bony orbit anatomy as explained by Dr. Mohey Hulail, Professor of Human Anatomy and Embryology at Al-Yarmouk University. Explore the structure of the pyramidal shaped cavity, its walls, roof, and optic canal.
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