Test 2 Flashcards
What forms the orbital roof?
82
Orbital process/plate of the frontal bone.
Lesser wing of the sphenoid bone.
What forms the orbital floor?
pg 82
Orbital process of the maxilla.
Zygomatic bone.
Orbital process of palatine bones (small part of floor; near apex).
What bones form the medial wall of the orbit?
82
Frontal process of the maxilla.
Lacrimal bone.
Orbital process of the ethmoid bone.
What bones from the lateral wall of the orbit?
82
Zygomatic bone.
Greater wing of sphenoid.
What is the optic canal associated with and what are it’s contents?
(84)
Associated with the lesser wing of the sphenoid.
Contains CN II and opthalmic a.
What borders the superior orbital fissure and what does it contain?
(84)
Bordered by the lesser and greater wings of the sphenoid.
Contains CN III, IV, V1, VI, and superior opthalmic n.
What are the contents of the inferior orbital fissure?
Infraorbital NAV.
What are the contents of the supraorbital foramen?
Supraorbital NAV
What are the contents of the infraorbital foramen and where does it lead to?
(84)
Contains the infraorbital NAV.
Leads to the floor of the orbit where it is continuous with the infraorbital groove/sulcus.
Where is the ethmoidal foramina located and what does it connect to?
(84)
Located on the medial wall of the orbit.
Connects to the ethmoid air cells.
What does the floor of the orbit separate?
84
Separates the orbit from the maxillary sinus.
Define palpebra, cilia, and supercilia.
(85)
Palpebra = eyelids. Cilia = eyelashes. Supercilia = eyebrows.
What does the medial caruncle include?
85
Lacrimal caruncle (fleshy prominence that includes sweat and sebaceous glands. Lacrimal puncta
What is the lacrimal puncta?
85
Pinhole sized opening at the lacrimal papilla that permits draining of lacrimal fluid from the cornea. Fleshy bump on superior and inferior palpebrae.
What helps to maintain the shape of the eyelids?
85
Tarsal plates.
Dense fibrous CT deep to the skin and muscle
What’s the function of tarsal glands?
85
Secretions to spread along margins of the eyelids to lubricate margins and help increase surface tension along margins => lacrimal fluid to stay on cornea.
What are some of the features of tarsal glands?
85
Embedded in tarsal plates.*
Can be seen if the eyelids are inverted.
Modified sebaceous glands (lipid like secretions).*
Open up along the margins of the eyelids.
What are the 2 types of ciliary glands?
86
Glands of moll: Small, modified sweat glands.
Glands of zeis: small modified sebaceous glands.
What is a sty?
Chalazion?
(86)
Sty= hordeolum; result of an infected gland of the eyelid. Chalazion= plugged gland; cyst-like.
What are the 2 portions of the conjunctive?
86
Palpebral: covers the internal surface of the eyelids.
Bulbar: reflects onto the “bulb”/eyeball => continuous with the outer cornea.
What are the conjunctiva fornices?
86
Where the palpebral conjunctiva meets the bulbar conjunctiva.
(Recesses of the conjunctiva).
What does the lacrimal gland secrete?
87
Lacrimal fluid (serous/watery fluid) through a series of ducts onto the cornea. (Lacrimal fluid circulates across the corneal surface and across the inner eyelids to moisten, clean, lubricate, and protect).
What’s the role of the parasympathetic fibers of the lacrimal gland?
(87)
Control lacrimation (secretomotor).
- Pregang.= CN VII (greater petrosel n).
- Postgang.= Associated with the sphenopalatine ganglion.
What’s the role of the sympathetic fivers of the lacrimal gland?
(87)
To arteries of the gland (vasomotor innervation).
-Postgang. are associated with the superior cervical ganglion of the sympathetic chain.