Eyes Flashcards
EXTERNAL ANATOMY
.
The eye is the sensory organ of vision
A)true
B)false
True
More than half the neocortex is involved with processing visual information.
A)true
B)false
True
the eye is well protected by the bony orbital cavity, surrounded with a cushion of fat.
A)true
B)false
True
The eyelids are like two movable shades that further protect the eye from injury, strong light, and dust. The upper eyelid is the larger and more mobile one.
A)true
B)false
True
The _________are short hairs in double or triple rows that curve outward from the lid margins, filtering out dust and dirt.
A)eyelashes
B)eyelids
A
The __________ is the elliptical open space between the eyelids (Fig. 14-l). When closed, the lid margins approximate completely. When open, the upper lid covers part of the iris.
A)palpebral fissure
B)eyelashes
A
The ___________ is just at the limbus, the border between the cornea and sclera.
A)lower lid margin
B)upper lid margin
C)both a and b
A
The________ is the corner of the eye, the angle where the lids meet. At the inner canthus, the caruncle is a small, fleshy mass containing sebaceous glands.
A)eyelashes come together
B)canthus
B
The canthus is the corner of the eye, the angle where the lids meet. At the inner canthus, the__________ is a small, fleshy mass containing sebaceous glands.
A)caruncle
B)canthus
A
Within the upper lid, tarsal plates are strips of connective tissue that give it
A)shape
B)color
C)both a and b
A
The tarsal plates contain the__________ glands, modified sebaceous glands that secrete an oily lubricating material onto the lids. This stops the tears from overflowing and helps form an airtight seal when the lids are closed
A)lacrimal
B)meibomian
B
The exposed part of the eye has a transparent protective covering, the__________. The________—- is a thin mucous membrane folded like an envelope between the eyelids and the eyeball.
A)cornea
B)rentia
C)conjunctiva
C
The ___________ lines the lids and is clear, with many small blood vessels. It forms a deep recess and then folds back over the eye.
A)palpebral conjunctiva
B)cornea
C)cataracts
A
The ________ overlays the eyeball, with the white sclera showing through.
A)bulbar conjunctiva
B)sclera
C)both a and b
A
At the limbus, the conjunctiva merges with the_______-.
A)rentia
B)cornea
C)iris
B
The cornea covers and protects the
A)iris
B)pupil
C)both a and b
C
The lacrimal apparatus provides constant irrigation to keep the conjunctiva and cornea moist and lubricated. The ____________, in the upper outer corner over the eye, secretes tears. The tears wash across the eye and are drawn up evenly as the lid blinks.
A)lacrimal gland
B)cornea gland
C)canthus gland
A
The _____________ provides constant irrigation to keep the conjunctiva and cornea moist and lubricated. The lacrimal gland, in the upper outer corner over the eye, secretes tears. The tears wash across the eye and are drawn up evenly as the lid blinks
A)lacrimal apparatus
B)cornea apparatus
A
The tears drain into the_______, visible on the upper and lower lids at the inner canthus. The tears then drain into the nasolacrimal sac, through the one-half-inch-long nasolacrimal duct, and empty into the inferior meatus inside the nose. A tiny fold of mucous membrane prevents air from being forced up the nasolacrimal duct when the nose is blown.
A)puncta
B)cornea
C)sinus
A
Six muscles attach the eyeball to its orbit and serve to direct the eye to points of the person’s interest. These extraocular muscles give the eye both straight and rotary movement. The four straight, or rectus, muscles are the superior, inferior, lateral, and medial rectus muscles. The two slanting, or oblique, muscles are the superior and inferior muscles.
A)true
B)false
True
Each muscle is coordinated, or yoked, with one in the other eye. This ensures that when the two eyes move, their axes always remain parallel (called conjugate movement). Parallel axes are important because the human brain can tolerate seeing only one image.
A)true
B)false
True
Each muscle is coordinated, or yoked, with one in the other eye. This ensures that when the two eyes move, their axes always remain parallel called
A)conjugate movement
B)ocular movement
A
Movement of the ___________ is stimulated by three cranial nerves. Cranial nerve VI, the abducens nerve, innervates the lateral rectus muscle (which abducts the eye); cranial nerve IV, the trochlear nerve, innervates the superior oblique muscle; and cranial nerve III, the oculomotor nerve, innervates all the rest-the superior, inferior, and medial rectus and the inferior oblique muscles.
A)intraocular muscles
B)extraocular muscles
B