A&P Lab Exercise 17 Flashcards
Where does light strike the eye?
In the posterior area called the retina
What happens to light rays in order for us to see?
The light rays are bent and focuses in a certain way to strike light sensitive cells
What structures does the retina contain?
Photoreceptors (rods and cones)
What happens when a photoreceptor is stimulated?
The rods and cones send impulses that travel by way of the optic nerve to the brain
What are the six intrinsic eye muscles?
Superior rectus Inferior rectus Lateral rectus Medial rectus Superior oblique Inferior oblique
What cranial nerve innervates the superior rectus?
III (oculomotor)
What cranial nerve innervates the inferior rectus?
III (oculomotor)
What cranial nerve innervates the lateral rectus?
VI (abducens)
What cranial nerve innervates the medial rectus?
III (oculomotor)
What cranial nerve innervates the superior oblique?
IV (trochlear)
What cranial nerve innervates the inferior oblique?
III (oculomotor)
What is the white part of the eye?
Sclera
What does the sclera do?
Protects and holds the shape of the eye
What does the cornea look like?
The transparent anterior part of the sclera
What does the cornea do?
Allows light to reach the retina and acts in some light refraction
What does the conjunctiva look like?
The thin mucous membrane covering the anterior surface of the eye
What does the conjunctiva do?
Secretes mucus to lubricate the eyeball