Ch. 13 The Peripheral Nervous System and Reflex Activity
Back
Problem 1
Which of the following structures is not part of the central nervous system? a. the brain, b. a nerve, c. the spinal cord, d. a tract.Problem 1
The large onion-shaped receptors that are found deep in the dermis and in subcutaneous tissue and that respond to deep pressure are a. epithelial tactile complexes, b. lamellar corpuscles, c. free nerve endings, d. muscle spindles.Problem 2
Proprioceptors include all of the following except a. muscle spindles, b. tendon organs, c. epithelial tactile complexes, d. joint kinesthetic receptors.Problem 3
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 corpuscleProblem 4
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. vestibulocochlearProblem 5
Destruction of the ventral horn cells of the spinal cord results in loss of a. integrating impulses, b. sensory impulses, c. voluntary motor impulses, d. all of these.Problem 5
The connective tissue sheath that surrounds a fascicle of nerve fibers is the a. epineurium, b. endoneurium, c. perineurium, d. epimysium.Problem 11
a. What is myelin? b. How does the myelination process differ in the CNS and PNS?Problem 14
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.Problem 27
Differentiate clearly between sensation and perception.Problem 29
Compare and contrast flexor and crossed-extensor reflexes.Problem 30
Characterize each receptor activity described below by choosing the appropriate letter and number(s) from keys A and B. _____ , _____ (1) You are enjoying an ice cream cone. _____ , _____ (2) You have just scalded yourself with hot coffee. _____ , _____ (3) The retinas of your eyes are stimulated. _____ , _____ (4) You bump (lightly) into someone. _____ , _____ (5) You are in a completely dark room and reaching toward the light switch. _____ , _____ (6) You feel uncomfortable after a large meal. Key A: a. exteroceptor b. interoceptor c. proprioceptor Key B: (1) chemoreceptor (2) mechanoreceptor (3) nociceptor (4) photoreceptor (5) thermoreceptorProblem 33
What is the homeostatic value of flexor reflexes?Problem 34
What clinical information can be gained by conducting somatic reflex tests?Problem 35
What is the structural and functional relationship between spinal nerves, skeletal muscles, and dermatomes?
