BSC 2086L Lab 1

What is the function of the levator palpebrae superioris muscle?

opens the eye

What actions are performed by the inferior oblique eye muscle?

eye roll, looks superiorly and laterally

What actions are performed by the superior oblique eye muscle?

eye roll, looks inferiorly and laterally

Which two bactericidal proteins are produced by tears?

lysozyme and IgA

What is performed when the palpebrae are opened then closed in succession?

blinking

What eye structure is a non-vascularized, transparent, fibrous covering of the middle eye’s outer surface which protects the eye and acts as an initial lens for focusing light into the eye?

cornea

What eye strcuture is the central opening that allows differing amounts of light into the eye depending upon its size?

pupil

Which muscles control enlarging pupil size in response to lower light levels?

pupillary dilator muscles

Which muscles control decreasing pupil size in response to brighter light levels?

pupillary constrictor muscles

Which pupillary reflex is assessed when light is shined into the eye to see how the pupils responds?

direct response

Which pupillary response assesses how the eye not being tested responds to differing amounts of light shined into the eye being tested?

consensual response

True or False? A normal pupillary reflex direct response to light shined into the eye is pupil dilation and pupil constriction occurs when light is stopped from shining into the eye

False

What structures comprise the fibrous layer of the eye?

sclera and cornea

Which eye layer contains the iris, choroid, and ciliary body?

vascular layer

Which eye layer is the most deep?

retinal layer

Name the photoreceptor cells.

rods and cones

Name three types of cones.

blue, green, and red

Which photoreceptors are mainly used in low light conditions?

rods

What area within the macula contains the highest concentration of cones?

fovea centralis

Name the area where the optic nerve originates.

optic disc

In addition to vitreous humor, what is vitreous body composed of?

collagen fibers and proteoglycans

Where would you find vitreous body?

posterior cavity of the eye

Where would you find aqueous humor?

anterior cavity of the eye

How do you check for pupillary accommodation?

put an object (penlight or finger) in front of the patient and slowly move it toward the patients face

Describe how an abnormal direct pupillary response appears when the light is shined into they eye.

absence or lesser constriction of pupil

Describe how to detect the consensual response of the pupils.

shine light in one eye and then see if the other eye responds the same way

Describe how to detect the direct response of the pupil.

shine light into one eye to see how that pupil responds

Identify the highlighted cow eye cranial nerve in this image (external segment).

optic nerve

Identify the highlighted cow eye structure that is also described as the "white" of the eye (external segment).

sclera

Identify the highlighted cow eye structure that is transparent and allows light to enter the eye (external segment).

cornea

Identify the highlighted cow eye structure representing the colored part of the eye (anterior segment).

iris

Identify the highlighted cow eye structure that allows light into the eye passing it to the lens (anterior segment).

pupil

Identify the highlighted cow eye structure that helps anchor the lens using suspensory ligaments (posterior segment).

ciliary body

Identify the highlighted cow eye structure (posterior segment).

lens

Identify the highlighted cow eye structure that is described as a gelatinous sac that fills the posterior cavity of the eye (posterior segment).

vitreous

Identify the highlighted cow eye structure that is the delicate neural layer (posterior segment).

retina

Identify the highlighted cow eye structure that lacks photoreceptors, therefore visual information cannot be received in this area (posterior segment).

optic disc