Chapter 16: Eye and Ear

Chapter 16: Eye and Ear

Complete Chapter Questions With Answers

Sample Questions Are Posted Below

MULTIPLE CHOICE

Directions: Each group of questions below consists of a numbered list of descriptive words or phrases accompanied by a diagram with certain parts indicated by letters or by a list of lettered headings. For each numbered word or phrase, select the lettered part or heading that matches it correctly and then insert the letter in the space to the right of the appropriate number. Sometimes more than one numbered word or phrase may be correctly matched to the same lettered part or heading.

________ Becomes the pigmented layer of the retina

ANS:   B

The external layer of the optic cup differentiates into the pigmented layer of the retina. The pigmented epithelium consists of a single layer of cells that reinforces the light-absorbing properties of the choroid membrane to reduce scattering of light within the eye.

________ Retinal fissure

ANS:   E

The retinal fissure (optic fissure) develops on the inferior surface of the optic cup and along the optic stalk. The hyaloid blood vessels pass into the optic cup along this cleft and supply the lens and the developing neural layer of the retina.

________ Becomes specialized for sensitivity to light

ANS:   C

The inner layer of the optic cup becomes the neural layer of the retina. It differentiates into the visual receptive portion of the adult retina. The inner layer of the optic cup also gives rise to the ciliary and the iridial parts of the retina.

________ Gives rise to the lens

ANS:   D

The lens develops from the lens vesicle, a derivative of the surface ectoderm. The anterior wall of this vesicle becomes the anterior epithelium of the adult lens. Cells of the posterior wall lengthen to form lens fibers, which grow into and gradually obliterate the cavity of the lens vesicle.