Special Senses - The Eye & Vision Flashcards
What is the clinical word for tears?
lacrimal secretions
Tears enter
lacrimal …
and drain into
lacrimal …
canaliculi
sac
Tears empty
into nasal cavity
via …
nasolacrimal duct
… gland produces and
secretes tears
Lacrimal
The white of the eye is refered to as the …
sclera
The mucous membrane covering inner surface
of eyelids & outer surface of eyeball is called the …
conjunctiva
What are the two cavities of the eye called?
- Anterior cavity
- Posterior cavity
What are the three tunic layers of the eye called?
- Fibrous
- Vascular
- Neural
The vitreous humor is a transparent, colorless, gel-like substance located in the … of the eye.
posterior cavity
Aqueous humor fills the … and … chambers of the eye
anterior
posterior
T or F
The cornea lacks blood vessels
T
What is the most sensitive structure of the eye and why?
Cornea because of free nerve endings
T or F
The choroid lacks blood vessels
F
Rich in blood vessels
In the choroid, … minimise light scattering
melanocytes
The … body coordinates the shape of the lens
ciliary
Which two rings of muscle cause the eye to constrict and dilate? And in what direction are they arranged?
- sphincter pupillae, arranged longitudinally
- dilator pupillae, arranged radially
Low light causes the …NS to dilate the pupils
S
High light causes the …NS to contrict the pupils
P
The lens is attached to the ciliary body by …
suspensory ligaments
The ciliary body is under the control of what NS?
ANS
Differences in density of … alter the speed of light molecules, and leads to a change in direction (bending)
medium
Signal processing in the retina happens via what four cell types?
- Bipolar cells
─ Horizontal cells
─ Amacrine cells
─ Ganglion cells
The “blind spot” of the eye is called the…
optic disc
