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Questions and Answers
What is the outermost layer of the eyeball called?
What is the outermost layer of the eyeball called?
- External fibrous coat (correct)
- Middle vascular coat
- Retinal layer
- Inner nervous coat
Which coat of the eye is responsible for providing nourishment to the eye tissues?
Which coat of the eye is responsible for providing nourishment to the eye tissues?
- Corneal layer
- Middle vascular coat (correct)
- Inner nervous coat
- External fibrous coat
What is the correct order of the coats of the eyeball from external to internal?
What is the correct order of the coats of the eyeball from external to internal?
- Inner nervous coat, middle vascular coat, external fibrous coat
- External fibrous coat, middle vascular coat, inner nervous coat (correct)
- Corneal layer, external fibrous coat, inner nervous coat
- Middle vascular coat, inner nervous coat, external fibrous coat
Which layer of the eye primarily contains sensory receptors?
Which layer of the eye primarily contains sensory receptors?
What is NOT a function of the middle vascular coat?
What is NOT a function of the middle vascular coat?
What is the movement that describes the pupil moving downwards?
What is the movement that describes the pupil moving downwards?
Which movement refers to the pupil moving laterally away from the nose?
Which movement refers to the pupil moving laterally away from the nose?
What is the term for the movement that results in the pupil moving towards the nose?
What is the term for the movement that results in the pupil moving towards the nose?
Which muscle is associated with the elevation of the eyeball?
Which muscle is associated with the elevation of the eyeball?
Which of the following movements occurs when the pupil is moved inferiorly?
Which of the following movements occurs when the pupil is moved inferiorly?
What is the primary function of the sclera?
What is the primary function of the sclera?
Where is the cornea located in relation to the eye?
Where is the cornea located in relation to the eye?
What is the main characteristic of the sclera?
What is the main characteristic of the sclera?
Which part of the eye is responsible for bending light to help it enter correctly?
Which part of the eye is responsible for bending light to help it enter correctly?
What connects the sclera to the cornea?
What connects the sclera to the cornea?
Which statement about the sclera is correct?
Which statement about the sclera is correct?
What is the color and transparency characteristic of the cornea?
What is the color and transparency characteristic of the cornea?
What is the main role of the choroid in the eye?
What is the main role of the choroid in the eye?
What is the role of the aqueous humor in the eye?
What is the role of the aqueous humor in the eye?
What is the main function of the vitreous body within the eye?
What is the main function of the vitreous body within the eye?
What prevents the eye's shape from changing, particularly in external pressure?
What prevents the eye's shape from changing, particularly in external pressure?
Which description best fits the structure of the cornea?
Which description best fits the structure of the cornea?
Which part of the eye is responsible for bending light to focus on the retina?
Which part of the eye is responsible for bending light to focus on the retina?
What is the primary component of the inner nervous coat of the eye?
What is the primary component of the inner nervous coat of the eye?
Which structure in the eye is primarily responsible for feeding the vascular coat?
Which structure in the eye is primarily responsible for feeding the vascular coat?
What describes the sclera?
What describes the sclera?
Which statement is true regarding the function of the cornea?
Which statement is true regarding the function of the cornea?
What is the main purpose of the lens within the eye?
What is the main purpose of the lens within the eye?
Which part of the eye has a transparent and curved shape to assist in light refraction?
Which part of the eye has a transparent and curved shape to assist in light refraction?
What is the primary role of the vitreous body?
What is the primary role of the vitreous body?
What happens if there is a blockage in the drainage of aqueous humor?
What happens if there is a blockage in the drainage of aqueous humor?
Which of the following accurately describes the lens of the eye?
Which of the following accurately describes the lens of the eye?
What composition is the vitreous body primarily made of?
What composition is the vitreous body primarily made of?
How does the lens contribute to vision?
How does the lens contribute to vision?
Which of the following statements is NOT true regarding the components of the eye?
Which of the following statements is NOT true regarding the components of the eye?
Which part of the eye is located behind the lens?
Which part of the eye is located behind the lens?
Why is glaucoma a serious condition?
Why is glaucoma a serious condition?
Which component of the eye is primarily responsible for adjusting focus based on the distance of an object?
Which component of the eye is primarily responsible for adjusting focus based on the distance of an object?
Which layer of the retina acts as a black background to help absorb excess light?
Which layer of the retina acts as a black background to help absorb excess light?
What type of cells are responsible for detecting light in the inner nervous layer of the retina?
What type of cells are responsible for detecting light in the inner nervous layer of the retina?
How does the retina connect with other eye structures?
How does the retina connect with other eye structures?
What happens when there is an obstruction to the drainage of the aqueous humor?
What happens when there is an obstruction to the drainage of the aqueous humor?
What is the vitreous body's role in the eye?
What is the vitreous body's role in the eye?
Which structure supplies blood to the retina?
Which structure supplies blood to the retina?
What is the composition of the aqueous humor in the eye?
What is the composition of the aqueous humor in the eye?
What type of nerve carries the signals from the retina to the brain?
What type of nerve carries the signals from the retina to the brain?
What is the primary effect of the outer pigmented layer of the retina?
What is the primary effect of the outer pigmented layer of the retina?
Flashcards
External Fibrous Coat
External Fibrous Coat
The outermost layer of the eyeball, providing protection and structure.
Middle Vascular Coat
Middle Vascular Coat
The middle layer of the eyeball, responsible for blood supply and nourishment.
Inner Nervous Coat
Inner Nervous Coat
The innermost layer of the eyeball, containing light-sensitive cells for vision.
Eye Coats
Eye Coats
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Eyeball
Eyeball
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Sclera
Sclera
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Cornea
Cornea
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Limbus
Limbus
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Choroid
Choroid
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Outer Fibrous Coat
Outer Fibrous Coat
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Retina
Retina
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Aqueous Humor
Aqueous Humor
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Vitreous Body
Vitreous Body
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Lens
Lens
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Accommodation
Accommodation
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Depression of the pupil
Depression of the pupil
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Abduction of the pupil
Abduction of the pupil
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Adduction of the pupil
Adduction of the pupil
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Elevation of the pupil
Elevation of the pupil
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Superior rectus innervation
Superior rectus innervation
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Outer Pigmented Layer
Outer Pigmented Layer
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Inner Nervous Layer
Inner Nervous Layer
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Photoreceptor cells
Photoreceptor cells
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Glaucoma
Glaucoma
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What is the vitreous body?
What is the vitreous body?
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What is aqueous humor?
What is aqueous humor?
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What is the lens?
What is the lens?
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What is glaucoma?
What is glaucoma?
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What is the purpose of aqueous humor?
What is the purpose of aqueous humor?
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What is the function of the vitreous body?
What is the function of the vitreous body?
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What is the primary function of the lens?
What is the primary function of the lens?
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How does the lens help with focusing?
How does the lens help with focusing?
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Where is the lens located inside the eye?
Where is the lens located inside the eye?
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How does the aqueous humor contribute to eye health?
How does the aqueous humor contribute to eye health?
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Study Notes
Eye Structure
- The eyeball is composed of three layers, from external to internal: the external fibrous coat, the middle vascular coat, and the inner nervous coat.
- The inside of the eyeball contains the aqueous humor, vitreous body, and the lens.
Outer Fibrous Coat
- The sclera is the posterior, opaque, white, and dense part.
- The cornea is the anterior, transparent part; it refracts light entering the eye.
- The sclera and cornea are continuous at the limbus (corneoscleral junction).
Middle Vascular Coat
- The choroid is a dark, vascular membrane behind the sclera, which nourishes the retina and absorbs excess light.
- The ciliary body contains the ciliary muscle, controlling lens shape for accommodation (focusing).
- The iris is the colored part, controlling pupil size to regulate light entry. The pupil is the central opening in the iris.
Inner Nervous Coat (Retina)
- The retina has two layers: the outer pigmented layer and the inner nervous layer.
- The outer layer absorbs excess light.
- The inner layer has photoreceptor cells that convert light into nerve signals.
- The retina's outer surface touches the choroid, and the inner surface touches the vitreous body.
Contents of the Eyeball
- The aqueous humor is a clear fluid filling the anterior and posterior chambers, maintaining eye shape and pressure.
- Obstruction in draining the aqueous humor leads to glaucoma, increasing intraocular pressure.
- The vitreous body is a transparent, jelly-like substance filling the space behind the lens, maintaining eye shape.
Muscles of the Eye
- Extrinsic muscles (extraocular muscles) move the eyeball.
- Superior rectus, inferior rectus, medial rectus, lateral rectus, superior oblique, and inferior oblique.
- Intrinsic muscles (within the eyeball) control lens shape and pupil size.
- Eye movements are described in three dimensions: elevation, depression, abduction, and adduction.
- Elevation: moving the pupil up
- Depression: moving the pupil down
- Abduction: moving the pupil laterally
- Adduction: moving the pupil medially
- Specific nerves control each eye muscle.
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