Chapter 13 The Peripheral Nervous System and Reflex Activity
The patellar ʺknee jerkʺ reflex is an example of a(n) ________.
A) extensor thrust reflex
B) stress reflex
C) cross extensor reflex
D) stretch reflex
The ________ nerve is not a branch of the trigeminal nerve.
Which of the following is at the lowest level of the CNS?
A) direct system
B) indirect system
C) projection level
D) Central Pattern Generators (CPGs)
The three primary levels of neural integration in a somatosensory system include all of the
following except the ________.
A) receptor level
B) circuit level
C) perceptual level
D) effector level
The posterior side of the thigh, leg, and foot is served by the ________ nerve.
B) common fibular
Starting at the spinal cord, the subdivisions of the brachial plexus are (in order):
A) roots, trunks, divisions, and cords
B) roots, divisions, cords, and trunks
C) divisions, roots, trunks, and cords
D) trunks, divisions, cords, and roots
The cranial nerve with a dual origin (brain and spinal cord) is the ________.
Which of the following is not a nerve plexus?
A major nerve of the lumbar plexus is the ________.
Spinal nerves exiting the cord from the level of L4 to S4 form the ________.
A) lumbar plexus
B) femoral plexus
C) sacral plexus
D) thoracic plexus
The abducens nerve ________.
A) supplies innervation to the lateral rectus muscle of the eye
B) relays sensory information from taste buds on the tongue
C) exits from the medulla
D) if paralyzed, exhibits Bellʹs palsy
Inborn or intristic reflexes ________.
A) are rapid, predictable, learned responses
B) are involuntary, yet may be modified by learned behavior
C) are autonomic only
D) are always mediated by the brain
Which of the following is not true about the integration center of a reflex arc?
A) The center may be a single synapse between a motor and a sensory neuron.
B) There are always multiple synapses with chains of interneurons.
C) It is always located in the CNS.
D) More complex reflex arcs in the center are polysynaptic reflexes.
Striking the ʺfunny boneʺ is actually stimulation of (or injury to) the ________.
A) radial nerve
B) sciatic nerve
C) ulnar nerve
D) median nerve
Which of the following numbers of pairs of spinal nerves is correct?
A) six cervical
B) twelve thoracic
C) six lumbar
D) eight sacral
Select the statement about plexuses that is most correct ________.
A) The dorsal rami of all spinal nerves unite to form complex networks
B) Only ventral rami form plexuses
C) Each branch of the plexus contains fibers from a single spinal nerve
D) The ventral rami of thoracic spinal nerves unite to form the thoracic plexus
A reflex that causes muscle relaxation and lengthening in response to muscle tension is called
A) Golgi tendon reflex
B) flexor reflex
C) crossed extensor reflex
D) plantar reflex
Pressure, pain, and temperature receptors in the skin are ________.
Potentially damaging stimuli that result in pain are selectively detected by ________.
Meissnerʹs corpuscles ________.
A) are found primarily in connective tissue
B) are anatomically unencapsulated
C) are interoceptors
D) are mechanoreceptors
Which receptors adapt most slowly?
A) smell receptors
B) pressure receptors
D) touch receptors
The trochlear nerve conveys proprioceptor impulses from the ________ to the brain.
A) medial rectus muscle
B) lateral rectus muscle
C) superior rectus muscle
D) inferior rectus muscle
Nerves that carry impulses toward the CNS only are ________.
A) afferent nerves
B) efferent nerves
C) motor nerves
D) mixed nerves
After axonal injury, regeneration in peripheral nerves is guided by ________.
A) Wallerian cells
B) Schwann cells
D) Golgi organs
Regeneration within the CNS ________.
A) is more successful than with the PNS
B) typically allows axonal sprouting of 20 mm
C) is prevented due to growth-inhibiting proteins of oligodendrocytes.
D) is promoted by growth inhibitors and glial scars
In a crossed extensor reflex, if the right arm were grabbed it would flex and the left arm would
A) also flex
Select the correct definition.
A) Magnitude estimation is the simplest level of sensation.
B) Perceptual detection is the ability to detect how much stimulus is applied to the body.
C) Pattern recognition allows us to see a familiar face.
D) Spatial discrimination allows us to recognize textures.
All processing at the circuit level going up to the perceptual level must synapse in the
C) reticular formation
The sciatic nerve is a combination of which two nerves?
A) pudendal and posterior femoral cutaneous
B) posterior femoral cutaneous and tibial
C) pudendal and common fibular
D) common fibular and tibial
The thickest and longest nerve of the body is found in the ________.
A) cervical plexus
B) brachial plexus
C) lumbar plexus
D) sacral plexus
Irritation of a major nerve of this plexus may cause hiccups.
A) cervical plexus
B) lumbar plexus
C) sacral plexus
D) thoracic plexus
Bellʹs palsy ________.
A) is characterized by partial paralysis of diaphragm muscles
B) is characterized by loss of vision
C) is often caused by inflammation of the trigeminal nerve
D) is characterized by paralysis of facial muscles
Babinskiʹs sign is ________.
A) normal in an infant less than 4 years old
B) a reflex whose physiological mechanism is well understood
C) when the great toe dorsiflexes and the other toes fan laterally
D) caused by incomplete development of the thalamus in the infant
A simple spinal reflex goes along which of the following reflex arcs?
A) effector, afferent neuron, integration center, efferent neuron, receptor
B) receptor, afferent neuron, integration center, efferent neuron, effector
C) effector, efferent neuron, integration center, afferent neuron, receptor
D) receptor, efferent neuron, integration center, afferent neuron, effector
Mixed cranial nerves containing both motor and sensory fibers include all except which of the
Transduction refers to conversion of ________.
A) presynaptic nerve impulses to postsynaptic nerve impulses
B) stimulus information to nerve impulses
C) receptor energy to stimulus energy
D) afferent impulses to efferent impulses
The flexor muscles in the anterior arm (biceps brachii and brachialis) are innervated by what
The cranial nerves that have neural connections with the tongue include all except the
Problems in balance may follow trauma to which nerve?
A fracture of the ethmoid bone could result in damage to which cranial nerve?
Select the statement that is most correct.
A) Ganglia are collections of neuron cell bodies in the spinal cord that are associated with
B) Ganglia associated with afferent nerve fibers contain cell bodies of sensory neurons.
C) The dorsal root ganglion is a motor-only structure.
D) The cell bodies of afferent ganglia are located in the spinal cord.
A fall or an improperly delivered gluteal injection could result in ________.
B) postpoliomyelitis muscular atrophy
Which nerve does not use the jugular foramen as a route of exit from the skull?
The peripheral nervous system includes ________.
A) sensory receptors
B) basal nuclei
C) the spinal cord
D) the corpus callosum
Feeling a gentle caress on your arm would likely involve all of the following except ________.
A) Meissnerʹs corpuscles
B) Merkel discs
C) Pacinian corpuscles
D) root hair plexuses
A patient who received a blow to the side of the skull exhibits the following signs and
symptoms on that side of the face: he is unable to close his eye, and the corner of his mouth
droops. Which cranial nerve has been damaged?
The circuit level of the somatosensory system delivers impulses to the appropriate level of the
A) spinal cord
C) brain stem
D) cerebral cortex
The projection level of the brain does not include the ________.
A) basal nuclei
B) brain stem nuclei
C) reticular formation
If the ventral root of a spinal nerve were cut, what would be the result in the tissue or region
that nerve supplies?
A) complete loss of sensation
B) a complete loss of voluntary movement
C) loss of neither sensation nor movement but only
of autonomic control
D) a complete loss of sensation and movement
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