Ch13 HW: The Peripheral Nervous System

Which of the following is a characteristic of both spinal and cranial nerves? They contain bundles of axons. They are predominantly motor. They are pure sensory. They are formed from the fusion of anterior and posterior roots.

They contain bundles of axons.

Which of the following are groups of neuronal cell bodies that are located within the ANS? nuclei tracts nerves ganglia

ganglia

Which cranial nerve is generally thought of as a mixed nerve? hypoglossal nerve (XII) glossopharyngeal nerve (IX) accessory nerve (XI) vestibulocochlear nerve (VIII)

glossopharyngeal nerve (IX)

Which cranial nerve detects smell? trochlear nerve (IV) olfactory nerve (I) oculomotor nerve (III) optic nerve (II)

olfactory nerve (I)

Which of the following parts of a spinal nerve carries sensory information only? posterior (dorsal) root anterior root anterior ramus posterior ramus

posterior (dorsal) root

Mechanoreceptors might detect which of the following sensations? temperature pressure light smell

pressure

Place the following steps in order for motor control. 1. Upper motor neurons stimulate lower motor neurons. 2. Sensory information is relayed back to the cerebellum so movement can be modified if needed. 3. Upper motor neurons in the premotor cortex select a motor program. 4. Lower motor neurons stimulate a skeletal muscle to contract. 5. The basal nuclei enable the thalamus to stimulate upper motor neurons of the primary cortex. 3, 5, 1, 2, 4 5, 3, 1, 4, 2 2, 5, 3, 1, 4 3, 5, 1, 4, 2

3, 5, 1, 4, 2

What is NOT true of muscle spindles? Muscle spindles are embedded within extrafusal muscle fibers. The contractile poles of intrafusal fibers within muscle spindles are innervated by γ-motor neurons. Muscle spindles are found within tendons. Muscle spindles are receptors for the stretch reflex.

Muscle spindles are found within tendons.

Predict the effects of damage to the lower motor neuron. The lower motor neuron will not be able to stimulate the upper motor neuron. Upper motor neurons would directly send impulses to the skeletal muscles. There would be increased levels of acetylcholinesterase in the synaptic cleft between lower motor neuron and skeletal muscle fiber. Skeletal muscle atrophy may occur.

Skeletal muscle atrophy may occur.

Which plexus provides motor and sensory innervation to the upper limb? brachial plexus cranial plexus sacral plexus lumbar plexus

brachial plexus

What part of the nervous system integrates and interprets information from PNS sensory neurons? somatic nervous system (SNS) central nervous system (CNS) visceral motor division, or autonomic nervous system (ANS) sensory (afferent) division

central nervous system (CNS)

The receptors for smell and taste are __________. photoreceptors mechanoreceptors chemoreceptors thermoreceptors

chemoreceptors

What connective tissue sheath wraps the axon of a neuron? endoneurium fascicle epineurium perineurium

endoneurium

Programmed, automatic responses, which require rapid communication between the sensory and motor branches of the nervous system, are called ____________. receptors plexuses reflexes transductions

reflexes

Reflexes that control skeletal muscle are called __________. spinal visceral monosynaptic somatic

somatic

Which division detects stimuli of the general senses and special senses? visceral motor division (autonomic nervous system) visceral sensory division somatic sensory division somatic motor division

somatic sensory division

The patellar reflex is a type of __________. stretch reflex cranial reflex withdrawal reflex Golgi tendon reflex

stretch reflex

Cranial nerve V is the __________. facial nerve trochlear nerve accessory nerve trigeminal nerve

trigeminal nerve

Cranial nerve IV is the __________. trochlear nerve abducens nerve trigeminal nerve facial nerve

trochlear nerve

Mechanoreceptors detect __________. light pain movement and joint position vibration and deep pressure

vibration and deep pressure

The sympathetic nervous system and parasympathetic nervous system are divisions of the: visceral motor division (or autonomic nervous system, ANS). somatic sensory division. visceral sensory division. somatic motor division.

visceral motor division (or autonomic nervous system, ANS).