A nurse is preparing to assess a patient's sensory function. Which cranial nerve should be tested for smell?
Olfactory nerve (CNI)
Facial nerve (CN VII)
Optic nerve (CN II)
Trigeminal nerve (CNV)
The Correct Answer is A
A. Olfactory nerve (CN I): The Olfactory nerve is a pure sensory nerve responsible for the sense of smell. It is tested by asking the patient to identify common scents (like coffee or mint) with their eyes closed.
B. Facial nerve (CN VII): The Facial nerve controls facial expressions and provides taste sensation to the anterior two-thirds of the tongue, but it is not involved in smell.
C. Optic nerve (CN II): The Optic nerve transmits visual information from the eyes to the brain.
D. Trigeminal nerve (CN V): The Trigeminal nerve is responsible for facial sensation (touch/pain) and motor functions like chewing. It can sense the "sting" of ammonia (a pain response), but not actual odors.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Lens:The lens is a transparent, flexible structure located behind the iris. By changing its shape (accommodation), it fine-tunes the focus of light onto the retina to allow clear vision at various distances.
B. Pupil:The pupil is simply the opening (hole) in the center of the iris that allows light to enter the eye. It does not focus light itself.
C. Iris:The iris is the colored muscle that controls the size of the pupil, regulating the amount of light entering, but not the focus.
D. Cornea:The cornea is the clear outer layer that provides the initial and strongest refraction (bending) of light. However, the lensis the structure responsible for the variable focusing adjustment required to see clearly.
Correct Answer is C
Explanation
A. Adipose tissue:Adipose (fat) tissue is primarily located in the hypodermis(subcutaneous layer), which is the layer beneath the dermis.
B. Stratum lucidum:This is a specific layer of the epidermis(the outermost skin layer), found only in thick skin like the palms and soles. If the wound has reached the dermis, it has already passed through the epidermis.
C. Sweat glands:The functional units of sweat glands, hair follicles, and sebaceous (oil) glands are located within the dermis. A wound extending into this layer would disrupt these structures.
D. Melanocytes:Melanocytes are pigment-producing cells located in the stratum basale, which is the deepest layer of the epidermis, sitting just above the dermis.
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