Eye structure and function

Question 1

What muscle controls contraction and closure of eyelid?

Answer 1

Orbicularis oculi muscle

Question 2

what muscle controls contraction and lifts or raises upper lid?

Answer 2

superior palpebral levator muscle

Question 3

lower lid retraction muscle?

Answer 3

capsulopalpebral fascia

Question 4

Three regions of conjunctiva
and two layers

Answer 4

bulbar
palpebral
conjunctival fornices

epithelium- goblet cells
stroma- immune cells

Question 5

eyelid anatomy what plates are there in eyelid and what ligaments hold them in place? and glands?

Answer 5

tarsal plates- rigidity and structure to eyelids
palpebral ligaments -hold tarsal plates in position during eyelid movement
meibomian glands

Question 6

Cells that transmit electrical signals:

Answer 6

Neural cells transmit signals
photoreceptors
bipolar, ganglion, amacrine and horizontal
GILAL CELLS:
mueller
astrocytes
microglia

Question 7

in the optic tract majority of info goes to LGN but some goes to _________ for pupil control

Answer 7

pretectal nucleus

Question 8

in the optic tract majority of info goes to LGN but some goes to _________ for circadian rhythms

Answer 8

suprachiasmaric nucleus

Question 9

in the optic tract majority of info goes to LGN but some goes to _________ for
co-ordinated movements of eyes and head

Answer 9

superior colliculus

Question 10

processing of visual information
magnocellular

Answer 10

found in bottom two layers of lgn
low acuity
no colour
motion
high sensitivity to flicker

Question 11

processing of visual information
parvocellular

Answer 11

top 4 layers
high acuity
colour
precision
slow flicker

Question 12

processing of visual information
konlocellular

Answer 12

blue and yellow colour information
they’re in thin layers in between the layers