Chapter 16 - Fill in the Blanks Flashcards
The _______ is a cone-shaped cavity in the front of the skull that contains the eyeball.
orbit
The __________, another name for the openings through which blood vessels pass into the eye.
foramina
The ______ ________ give passage to the optic nerve and the ophthalmic artery.
optic foramen
_________ control the movement of the eye and also help maintain the shape of the eyeball.
muscles
The ________ covers the eyeball and protects it from light, foreign particles, and impact. It also helps to keep the eyeball lubricated and free from dust and debris.
eyelids
The ______ _______ includes the lacrimal gland, canaliculi sac, and nasolacrimal duct.
lacrimal apparatus
The ______ ______ secretes tears through ducts onto he surface of the conjunctiva of the upper lid.
lacrimal gland
The ______ _______ are two ducts at the inner corner of the eye that collect tears and drain into a sac.
lacrimal canaliculi
Tears secreted bu the lacrimal glands are pulled into the ________ ___.
lacrimal sac
The passageway draining lacrimal fluid into the nose is known as the ____________ ______.
nasolacrimal duct
The eyeball contains 2 chambers. The _______ chamber is filled with a watery fluid known as ________ _____. And the ________ chamber is filled with a jellylike material called ________ _______.
(watery fluid) anterior = aqueous humor
(jellylike material) posterior = vitreous humor
The eyeball’s outer layer is composed of the _______ or the white of the eye.
sclera
The curved surface of the ________ is important because it bends light rays and helps to focus them on the surface of the retina.
cornea
The _______ is the middle layer of the eyeball.
uvea
The ______ is a coloured membrane in the eye.
iris
The _______ has a circular opening in its center and is surrounded by muscles that contract or dilate to regulate the amount of light admitted into the eye.
pupil
The ________ is the vascular membrane of the eye.
choroid
The innermost layer of the eye is the _______ and contains photoreceptor cells.
retina
There are 2 types of photoreceptor cells. The _____ are sensitive to dim light and used for night vision, and the _____ are sensitive to bright light and colour vision
rods (night vision)
cones (bright light / colour)
The point at which nerve fibres from the retina converge to form the optic nerve is known as the _____ _____.
optic disk
The _____ is suspended by ligaments just behind the iris. Contraction and relaxation of muscles control the ligaments to change the shape.
lens
The function of the lens of the eye is to sharpen the focus of the light on the retina, this process is called ___________.
accommodation
