Mastering A&P Ch.18

What structure produces, distributes, and removes tears in the eye, to reduce friction, remove debris, prevent infection, and provide nutrients and oxygen to parts of the conjunctival epithelium?

Lacrimal apparatus

Which of the following bones is not considered an auditory ossicle?

Petrous part of the temporal bone

Which of the following is NOT a function of the vascular tunic of the eye?

Regulating the amount of light exiting the anterior portion of the eye

Which of the following structures equalizes the pressure in the middle ear cavity with external atmospheric pressure, to prevent distortion of the tympanic membrane?

Auditory tube

Which portion of the eye begins at the junction between the cornea and sclera and extends posteriorly to the ora serrata?

Ciliary body

Place the steps in the production of an auditory sensation in order from start to finish. Information concerning the frequency and intensity of stimulation is relayed to the CNS over the cochlear branch of N VIII. The pressure waves distort the basilar membrane on their way to the round window of the tympanic duct. Sound waves arrive at the tympanic membrane. Movement of the stapes at the oval window establishes pressure waves in the perilymph of the vestibular duct. Vibration of the basilar membrane causes vibration of hair cells against the tectorial membrane, resulting in hair cell stimulation and neurotransmitter release. Movement of the tympanic membrane causes displacement of the auditory ossicles.

364251

Which of the following structures is not a subdivision of the bony labyrinth?

Cochlear duct

In a sectional view of the inner ear, which structure lies between a pair of perilymphatic chambers, which are interconnected at the tip of the cochlear spiral?

Cochlear duct (scala media)

Reflexive motor commands issued by the vestibular nucleus are distributed to the motor nuclei for which cranial nerves?

III, IV, VI, and XI

Which of the following is not part of the visual pathway?

Medial geniculate nucleus of the thalamus

Which cranial nerves monitor taste buds?

N VII, N IX, N X

Which of the following statements is not true, concerning the semicircular canals?

There are 2 semicircular canals, the anterior and posterior canals; this makes it possible to analyze movement in two rotational planes.

Which of the following is not a function of the vestibular nuclei?

To relay information from the vestibular apparatus to the parietal lobe of the brain

Information concerning the general texture of food, together with taste-related sensations of "peppery" or "burning hot," is provided by sensory afferents in which cranial nerve?

Trigeminal nerve (N V)

Which of the following statements regarding visual image focusing is incorrect?

When the ciliary muscles contract, the ciliary body moves toward the lens, causing it to assume a flattened shape.

Which of the following is a type of papilla on the human tongue?

all

Which of the following is/are (a) function(s) of the fibrous tunic of the eye?

all

Which of the following is not a primary taste sensation?

all are

All of the following are true about the photoreceptors of the retina, except:

cones are much more sensitive to light than rods, so they provide for vision in dim lighting conditions.

All of the following statements are true of the utricle and saccule, except:

receptors in the utricle and saccule respond best to rotational movements of the head.

The fibrous tunic of the eye consists of the:

sclera and cornea.

Before reaching the cerebral cortex and conscious awareness, ascending auditory sensations synapse in the __________.

thalamus

All of the following statements are true of the organization of the retina, except:

the layer of rods and cones, the visual receptors, lie farthest from the pigmented layer, and closest to incoming light.