Eye FINAL Flashcards
The EYBALL aka ‘the globe’ , or the ‘eye bulb’ is located in the skull’s bony socket called….
the orbit.
The eye is composed of…..
The lens
Three Layers:
- Outer Fibrous Tunic
- Middle Vascular Tunic
- The Inner Retinal Tunic
The ________ also known as the accessory ocular structures are the supporting structures.
ADNEXA
The ADNEXA also known as the accessory ocular supporting structures include..
Palpabrae (eyelids)
Third Eyelid and Conjunctiva
The lacrimal apparatus
Identify A
Sclera of the Fibrous Tunic
Identify B
Cornea of the Fibrous Tunic
Identify C
Iris of the Vascular Tunic
Identify D
Ciliary Body of the Vascular Tunic
Identify E
Choroid of the Vascular Tunic
Identify F
Pigmented Layer of the Retina
Identify G
Neural Layer of the Retina
What are the Tunics of the eye?
Fibrous Tunic
Vascular Tunic
Neuro-Epithelial Tunic
Fibrous Tunic is composed of
A. Sclera
B. Cornea
C. Limbus
Vascular Tunic is composed of
A. Iridocorneal angle
B. Iris
C. Ciliary Body
D. Choroid
Neuro-Epithelial Tunic =
Retina
What tunic of the eye is labeled A?
Fibrous Tunic
What tunic of the eye is labeled B?
Vascular Tunic
What tunic of the eye is labeled C?
Nervous Tunic
What is the posterior, white, opaque layer of dense irregular connective tissue?
**Sclera **
What are the functions of the Sclera?
- Protects the eye
- Maintains the shape of the eye
- Provides insertion points for tendons of extraocular muscles.
What is the anterior portion of the eye? This is an avascular, transparent, convex-concave lens.
Cornea
What is outlined in the rectangle?
Cornea
The cornea is richly supplied by ________
sensory nerves (ophthalmic branch of Cr. N. V)
The cornea is relatively _________ to maintain transparency.
Dehydrated
True or False
The Cornea has remarkable regenerative capacity.
TRUE
The Cornea is composed of ___ Layers.
5
CORNEA. Name labels.
CORNEA. What is 1?
Anterior Corneal Epithelium
CORNEA: What is 5?
Posterior epithelium of cornea, corneal endothelium.
CORNEA: What is 1?
Anterior corneal epithelium
CORNEA: What is 2?
Anterior limiting membrane
CORNEA: What is 3?
Stroma (substantia propria)
CORNEA: What is 4?
Descemet’s membrane
CORNEA: What is 5?
Posterior epithelium (corneal endothelium)
•Corneal _____ is avascular and composed of dense connective tissue, with collagen bundles regularly arranged (parallel), embedded in ground substance (proteoglycans) that maintain a precise organization of the approximately ____layers of collagen.
Stroma
60
•Cells of the corneal endothelium maintain transparency and optimal light refraction via active protein synthesis, and ________ allow passive transport of chloride and water.
Na+ Pumps
Orientation of the collagenous laminae aids in _________ of cornea.
transparency
What is going on here?
Corneal Ulcer
______is the corneoscleral junction where the opaque sclera overlaps the transparent cornea. This area has small blood vessels.
Limbus
•Microvasculature of limbus and aqueous humor of the anterior chamber provide ________ for the corneal.
Metabolites
Vascular Tunic is composed of?
Iridocorneal Angle
Iris
Ciliary Body
Choroid
________ is located anterior to the lens and separates the anterior and posterior chambers.
IRIS
__________ suspends the lens, contains smooth muscle for accommodation; has processes covered by secretory epithelium.
CILIARY BODY
•___________- vascular supply to optical retina. Contains pigment; TAPETUM LUCIDUM (in many species).
CHOROID
•The limbus is the region where the transparent cornea merges with the ____________.
vascular sclera = S
The epithelium of the limbus is continuous with the ___________that lines the eyelids
Conjunctiva (C)
•The ______ is the shutter of the eye.
IRIS
•The iris has a central opening, the _______, that communicates the anterior and posterior chamber.
PUPIL
________ and ___________ muscles control amount of light to which the retina is exposed
Dilator and sphincter pupillae muscles control amount of light to which the retina is exposed
•The ______ contains stroma of pigmented loose connective tissue, dilator and sphincter pupillae muscles and a posterior epithelium.
IRIS
•Pigment or iridial melanin present in the ___________ determines eye color.
stromal cells
________________ are present in equids and ruminants at the dorsal and ventral pupillary margins.
•Iridic granules (corpora nigra)
•The iris forms half of _________________, also called filtration angle and drainage angle.
IRIDOCORNEAL ANGLE
Label Image
AC= Anterior Chamber
CP = Constrictor Pupillae
PC = Posterior Chamber
EYE COLOR
•____________ – minimal pigment in stroma of iris; pigment only in pigmented epithelium of iridal part of retina
•Blue iris
•Increasing pigment in stroma – ______________
greenish/blue gray - brown iris
__________ is an inherited congenital disorder, characterized by a partial or total lack of melanin pigment in the eyes, skin and hair or more rarely in the eyes alone.
Albinism
•The _____________ is an anterior expansion of the choroid at the level of the lens with mechanical and secretory functions.
ciliary body
The _________ is seen as a thickened ring of tissue lying just inside the anterior portion of the sclera.
Ciliary Body
•Ciliary muscle (smooth muscle) has a _________ function, it contracts during accommodation, reduces tension of the zonular fibers of the lens.
mechanical
