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Ch. 13 The Peripheral Nervous System and Reflex Activity
Marieb - Human Anatomy & Physiology 7th Edition
Marieb, Hoehn7th EditionHuman Anatomy & PhysiologyISBN: 9780805359091Not the one you use?Change textbook
All textbooksMarieb, Hoehn 7th EditionCh. 13 The Peripheral Nervous System and Reflex ActivityProblem 7
Chapter 13, Problem 7

The portion of the fibrous layer that is white and opaque is the
a. Choroid
b. Cornea
c. Retina
d. Sclera

Verified step by step guidance
1
Understand the structure of the fibrous layer of the eye, which consists mainly of two parts: the cornea and the sclera.
Recall that the cornea is the transparent, clear part of the fibrous layer that allows light to enter the eye.
Recognize that the sclera is the white, opaque portion of the fibrous layer, providing protection and structural support to the eye.
Eliminate options that are not part of the fibrous layer: the choroid is part of the vascular layer, and the retina is the innermost neural layer.
Conclude that the white and opaque portion of the fibrous layer is the sclera.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Fibrous Layer of the Eye

The fibrous layer is the outermost layer of the eyeball, providing structural support and protection. It consists mainly of two parts: the sclera and the cornea. Understanding this layer is essential to identify which part is white and opaque.
Recommended video:
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5:59
Fibrous Layer

Sclera

The sclera is the white, opaque portion of the fibrous layer. It covers most of the eyeball and maintains the shape of the eye while protecting internal components. Its opacity distinguishes it from the transparent cornea.
Recommended video:
Guided course
5:59
Fibrous Layer

Cornea

The cornea is the transparent, dome-shaped front part of the fibrous layer that allows light to enter the eye. Unlike the sclera, it is clear and plays a key role in focusing vision. Recognizing its transparency helps differentiate it from the sclera.
Recommended video:
Guided course
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Fibrous Layer
Related Practice
Textbook Question

Match the names of the cranial nerves in column B to the appropriate description in column A.

Column A 

_______    (1) Causes pupillary constriction 

_______    (2) The major sensory nerve of the face

_______    (3) Serves the sternocleido-mastoid and trapezius muscles 

_______    (4) Purely sensory (two nerves) 

_______    (5) Serves the tongue muscles 

_______    (6) Allows you to chew your food 

_______    (7) Impaired in Bell's palsy

_______    (8) Helps regulate heart activity

_______    (9) Helps you hear and maintain your balance 

_______   (10) Contain parasympathetic motor fibers (four nerves)

Column B

a. Abducens

b. Accessory

c. Facial

d. Glossopharyngeal

e. Hypoglossal

f. Oculomotor

g. Olfactory

h. Optic

i. Trigeminal

j. Trochlear

k. Vagus

l. Vestibulocochlear

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Textbook Question

The connective tissue sheath that surrounds a fascicle of nerve fibers is the

a. Epineurium

b. Endoneurium

c. Perineurium

d. Epimysium

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Textbook Question

Accessory glands that produce an oily secretion are the

a. Conjunctiva

b. Lacrimal glands

c. Tarsal glands

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Textbook Question

Which sequence best describes a normal route for the flow of tears from the eyes into the nasal cavity?

a. Lacrimal canaliculi, lacrimal sacs, nasolacrimal ducts

b. Lacrimal ducts, lacrimal canaliculi, nasolacrimal ducts

c. Nasolacrimal ducts, lacrimal canaliculi, lacrimal sacs

1042
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Textbook Question

Of the neurons in the retina, the axons of which of these form the optic nerve?

a. Bipolar cells

b. Ganglion cells

c. Cone cells

d. Horizontal cells

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Textbook Question

Taste buds are found on the

a. Anterior part of the tongue

b. Posterior part of the tongue

c. Palate

d. All of these

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