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Exam 1 bio 212
Terms in this set (24)
Select the extrinsic eye muscle that is innervated by the trochlear nerve (IV).
Which of the following statements about the cornea is true?
The cornea lacks blood vessels.
- An inability to move the eye laterally would indicate a problem with which muscle and nerve?
Lateral rectus muscle and abducens nerve (VI)
Arrange the structures of the wall of the eyeball in their correct sequence, from deep to superficial.
Retina, choroid, sclera
Which of the following is true with regards to eye muscles?
The extrinsic eye muscles are among the most precisely and rapidly controlled skeletal muscles in the entire body. This precision reflects their high axon-to-muscle-fiber ratio: The motor units of these muscles contain only 8 to 12 muscle cells and in some cases as few as two or three.
Which of the following is false when considering eyelids?
The levator palpabrae muscle encircles the eye and closes the eye when it contracts. The orbicularis oculi muscle raises the eyelid to open the eye.
The ___________is not a part of the vascular layer of the eye.
Which of the following is false regarding the cornea?
The cells of the cornea have active water pumps to keep the water content Of the cornea low.
When a person cries, he or she tends to keep on wiping their dripping nose. The nose drips because
lacrimal gland secretions wash the eyeball and drain into the lacrimal sac, which empties into the nasal cavity
Correctly match the term and definition: Blind spot or optic disc.
Region where the optic nerve exits the eye
Seventy percent of the sensory receptors in the body are involved with
Given your knowledge of the muscles of the eye, what changes in eye movements would occur with damage to the trochlear nerve (IV)?
The affected eye would not be able to move downward and laterally.
Match the part of eyeball with the correct definition: Choroid.
Blood vessel laden component of the vascular layer
Which of the following types of stimulation results in an increase in the diameter of the pupil?
Match the part of the lacrimal apparatus to the correct function: Lacrimal gland.
Releases tears into the superior part of the conjunctival sac
Which of the following is true for the central artery and central vein of the retina?
Enter and leave the eye via the optic nerve
- The conjunctiva lines
both the inner surface of the eyelids and the visible portion of the sclera
Correctly match the term and definition: Aqueous humor.
Clear, plasma-like substance that bathes the lens and cornea
Correctly match the term and definition: Vitreous humor.
Thick, jelly-like substance in the posterior segment of the eye
Match the following term with the appropriate description: Cataract.
Clouding of the lens
What is the function of the eyebrows?
Help shade the eyes from sunlight
Pinkeye is caused by an infection that produces inflammation of the
Strabismus is caused by
congenital weakness of the extrinsic muscles of the eye
Match the part of eyeball with the correct definition: Retina.
Contains both pigmented and sensory layers
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