13. The Peripheral Nervous System

What are the four types of papillae on the human tongue?

The larger the receptive field, the

(a) Larger the stimulus needed to stimulate a sensory receptor

(b) Fewer sensory receptors there are

(c) Harder it is to locate the exact point of stimulation

(d) Larger the area of the somatosensory cortex in the brain that deals with the area

(e) Closer together the receptor cells

Identify six types of tactile receptors located in the skin, and describe their sensitivities.

______detect the degree to which a muscle is stretched, whereas______detect the force of a muscle contraction.

First-order somatic sensory neurons are_____neurons whose cell bodies are located in the_____.

a. Multipolar, posterior horn

b. Pseudounipolar, posterior root ganglion

c. Bipolar, anterior horn

d. Pseudounipolar, posterior horn

What three steps are necessary for transduction to occur?

All of the following descriptions refer to dorsal column–medial lemniscal ascending pathways except one:

a. They include the fasciculus gracilis and fasciculus cuneatus.

b. They include a chain of three neurons.

c. Their connections are diffuse and poorly localized.

d. They are concerned with precise transmission of one or a few related types of sensory input.

The aspect of sensory perception by which the cerebral cortex identifies the site or pattern of stimulation is

(a) perceptual detection

(b) feature abstraction

(c) pattern recognition

(d) spatial discrimination

Match the receptor type in column B to the correct description in column A.

Column A

______    (1) Pain, itch, and temperature receptors

______    (2) Contains intrafusal fibers and anulospiral and flower spray endings

______    (3) Discriminative touch receptor in hairless skin (fingertips)

______    (4) Contains receptor endings wrapped around thick collagen bundles

______    (5) Rapidly adapting deep-pressure receptor

______    (6) Slowly adapting deep-pressure receptor

Column B

a. Bulbous corpuscles

b. Tendon organ

c. Muscle spindle

d. Free nerve endings

e. Lamellar corpuscle

f. Tactile corpuscle

The CNS interprets information entirely on the basis of the

(a) Number of action potentials that it receives

(b) Kind of action potentials that it receives

(c) Line over which sensory information arrives

(d) Intensity of the sensory stimulus

(e) Number of sensory receptors that are stimulated

Which receptor type would you expect to find on the tongue, allowing us to taste?