Questions and Answers
What is the function of the eyebrows?
Help shade the eyes from sunlight.
Match the part of the eyeball with the correct definition: Choroid.
Choroid = Blood vessel laden component of the vascular layer. i = n
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.
Match the part of the eyeball with the correct definition: Retina.
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Correctly match the term and definition: Blind spot or optic disc.
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Which of the following is false when considering eyelids?
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An inability to move the eye laterally would indicate a problem with which muscle and nerve?
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Match the part of the lacrimal apparatus to the correct function: Lacrimal gland.
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Which of the following is true regarding eye muscles?
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What changes in eye movements would occur with damage to the trochlear nerve (IV)?
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Select the extrinsic eye muscle that is innervated by the trochlear nerve (IV).
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Which of the following types of stimulation results in an increase in the diameter of the pupil?
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Pinkeye is caused by an infection that produces inflammation of the __________.
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Which of the following is false regarding the cornea?
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Match the following term with the appropriate description: Cataract.
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Seventy percent of the sensory receptors in the body are involved with __________.
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Which of the following statements about the cornea is true?
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Which of the following is true for the central artery and central vein of the retina?
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Correctly match the term and definition: Vitreous humor.
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Strabismus is caused by __________.
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The conjunctiva lines __________.
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The __________ is not a part of the vascular layer of the eye.
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Correctly match the term and definition: Aqueous humor.
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Arrange the structures of the wall of the eyeball in their correct sequence, from deep to superficial.
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Match the nerve with the correct function: Glossopharyngeal nerve (IX).
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The base of the stapes is associated with which structure?
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Match the following type of taste with what causes it: Sour.
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Select the letter that corresponds to the tectorial membrane of the spiral organ.
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Correctly match the term to its description: Endolymph.
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Select the receptor region for hearing.
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Match the following: A.
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Match the following: B.
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Match the following: C.
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Match the following: D.
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Match the following: E.
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Match the following type of taste with what causes it: Salty.
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Which of the following is not a modality of taste sensations?
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Correctly match the term to its description: Round window.
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Which of the following is an incorrect match?
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Match the nerve with the correct function: Branch of the facial nerve (VII) called the chorda tympani.
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Which of the following is improperly matched?
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Which of the following would not be found in the external (outer) ear?
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Which of the following is/are a part of the external (outer) ear?
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Match the following: Function of A.
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Match the following: Function of B.
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Match the following: Function of C.
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The spiral organ is found in the __________.
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The tiny skeletal muscles associated with the ossicles of the middle ear function to __________.
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Match the following type of taste with what causes it: Sweet.
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Match the following type of taste with what causes it: Bitter.
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Match the nerve with the correct function: Vagus nerve.
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Which of the following is false?
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Study Notes
Eyeball Anatomy and Function
- Eyebrows shade the eyes from sunlight.
- Choroid is a blood vessel-rich component of the vascular layer of the eye.
- Tears from the lacrimal gland wash the eyeball and drain into the nasal cavity, causing a dripping nose when crying.
- Retina comprises both pigmented and sensory layers, crucial for light processing.
- Blind spot, or optic disc, is where the optic nerve exits the eye.
- Eyelid movements are controlled by the orbicularis oculi muscle, while the levator palpebrae opens the eyelid.
Eye Muscles and Innervation
- Lateral rectus muscle, innervated by the abducens nerve (VI), controls lateral eye movement.
- Extrinsic eye muscles have a high axon-to-muscle-fiber ratio, allowing precise and rapid control.
- Damage to the trochlear nerve (IV) prevents the affected eye from moving downward and laterally.
- Superior oblique muscle is specifically innervated by the trochlear nerve (IV).
Pupillary Response and Conjunctiva
- Sympathetic stimulation causes an increase in pupil diameter.
- Pinkeye is an infection that results in inflammation of the conjunctiva.
- The conjunctiva lines both the inner surface of the eyelids and the visible part of the sclera.
Eye Components and Structure
- Cornea lacks blood vessels and does not actively pump water to maintain low water content.
- Cataract refers to the clouding of the lens.
- Vitreous humor is a thick, jelly-like substance located in the posterior segment of the eye.
- Aqueous humor is a clear, plasma-like fluid bathing the lens and cornea.
Hearing and Taste Sensation
- Seventy percent of the body’s sensory receptors are associated with sight.
- Spiral organ is the receptor region for hearing and located in the cochlear duct.
- Endolymph is the fluid found within the membranous labyrinth of the inner ear.
- Taste sensation modalities include sweet (sugars, alcohols), salty (metal ions), sour (acids), and bitter (alkaloids).
Nerve Functions Related to Taste and Hearing
- Glossopharyngeal nerve (IX) transmits taste sensation from the posterior third of the tongue.
- The chorda tympani, a branch of the facial nerve (VII), transmits taste sensations from the anterior two-thirds of the tongue.
- Vagus nerve transmits taste sensations from the epiglottis and lower pharynx.
- Functions of structures in the ear include equalizing pressure (pharyngotympanic tube) and dampening loud sounds.
Innate Conditions and External Ear
- Strabismus, a condition of misalignment, is caused by congenital weakness of the extrinsic eye muscles.
- External ear components include the auricle, but excludes the pharyngotympanic tube.
- Ossicles are protected from loud sounds by tiny skeletal muscles associated with them.
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Description
Test your knowledge on the anatomy and function of the eyeball with this engaging quiz. Explore topics like the layers of the eye, eye muscles, and the neural innervation that controls vision. Perfect for students of anatomy or anyone interested in understanding how our eyes work!