A&P Homework (12.1-12.14)

Which of the following is a nerve of the lumbar plexus? A) genitofemoral nerve B) sciatic nerve C) posterior femoral cutaneous nerve D) pudendal nerve

genitofemoral nerve

Which nerve of the sacral plexus supplies an extensor of the hip? A) sciatic nerve B) posterior femoral cutaneous nerve C) inferior gluteal nerve D) pudendal nerve

inferior gluteal nerve

The dorsal ramus: A) is present in the thoracic and superior lumbar segments of the spinal cord. B) innervates the muscles, joints, and skin of the back. C) innervates structures in the lateral and anterior trunk as well as the limbs. D) monitors specific bilateral regions of the skin surface.

innervates the muscles, joints, and skin of the back

Reflexes that activate muscles on the same side of the body as the stimulus are called A) collateral. B) bilateral. C) ipsilateral. D) contralateral. E) antilateral

ipsilateral

The stretch reflex A) is an example of a polysynaptic reflex. B) is important in regulating muscle length. C) involves a receptor called the Golgi tendon organ. D) is activated when a smooth muscle lengthens. E) None of the answers is correct.

is important in regulating muscle length.

Reflexes controlled by the spinal cord involve A) sensory input to reflex centers in the brain. B) motor input to reflex centers in the spinal cord. C) sensory output over cranial nerves to effectors. D) motor output over spinal nerves to effectors. E) sensory input over cranial nerves to the spinal cord

motor output over spinal nerves to effectors.

The white matter of the spinal cord is/are A) neuroglia. B) nodes of Ranvier. C) myelinated axons and unmyelinated axons. D) Schwann cells.

myelinated axons and unmyelinated axons.

The ________ nerve, which arises in the cervical plexus, innervates the diaphragm. A) radial B) ansa cervicalis C) lesser occipital D) phrenic E) sciatic

phrenic

Which neuronal circuit pattern is similar to a positive feedback loop involving neurons? A) divergence B) serial processing C) reverberation D) convergence

reverberation

Which structure contains preganglionic and postganglionic fibers innervating structures in the thoracic cavity? A) dorsal ramus B) ventral ramus C) dorsal root D) sympathetic nerve

sympathetic nerve

Which efferent nerve is involved in the plantar reflex? A) tibial nerve B) femoral nerve C) genitofemoral nerve D) pudendal nerve

tibial nerve

Which is correct regarding the spinal cord? A) The cord itself is as long as the vertebral column. B) The amount of gray matter is greatest in segments of the spinal cord dedicated to the sensory and motor control of the head and neck. C) The dorsal and ventral roots gradually shorten with age. D) The adult spinal cord ends between vertebrae L1 and L2.

The adult spinal cord ends between vertebrae L1 and L2.

The epidural space contains A) lymph. B) blood. C) cerebrospinal fluid. D) denticulate ligaments. E) connective tissue and blood vessels.

connective tissue and blood vessels.

Which of the following reflexes involves a contralateral reflex arc? A) crossed extensor reflex B) patellar reflex C) withdrawal reflex D) biceps reflex

crossed extensor reflex

Which structure lies between the pedicles of the adjacent vertebrae? A) dorsal root ganglion B) denticulate ligament C) conus medullaris D) ventral root

dorsal root ganglion

Which is the innermost connective tissue layer of the spinal nerve that surrounds each axon? A) endoneurium B) perineurium C) fascicle D) epineurium

endoneurium

Define gray matter in the spinal cord. A) It is neural tissue that contains the cell bodies of sensory neurons whose axons carry information to the spinal cord. B) It is neural tissue that contains large numbers of myelinated and unmyelinated axons. C) It contains the axons of motor neurons that extend into the periphery. D) It is neural tissue that is dominated by the cell bodies of neurons, neuroglia, and unmyelinated axons, and it surrounds the narrow central canal.

It is neural tissue that is dominated by the cell bodies of neurons, neuroglia, and unmyelinated axons, and it surrounds the narrow central canal.

Which of the following correctly describes a difference between the gray and white rami communicantes of a spinal nerve? A) The gray ramus has both somatic and visceral motor fibers, while the white ramus has only visceral motor fibers. B) The white ramus contains myelinated fibers, and the gray ramus does not. C) The white ramus has only motor fibers, while the gray ramus has both motor and sensory fibers. D) The gray ramus carries information toward the spinal cord, and the white ramus carries it away.

The white ramus contains myelinated fibers, and the gray ramus does not.

Regarding reflexes in normal adults: A) a negative Babinski reflex occurs. B) the plantar reflex involves the fibular nerve. C) stroking the lateral side of the sole results in extension of the toe joints. D) a positive Babinski reflex occurs.

a negative Babinski reflex occurs

When does the activation of a motor neuron occur in a stretch reflex? A) after information processing in the CNS B)prior to activation of a sensory neuron C) prior to activation of a receptor D) after the response of a peripheral effector

after information processing in the CNS

Jim was in a car accident and suffered damage to the dorsal ramus of several spinal nerves in his lumbar region. What problems might he experience as a result? A) loss of sensation from affected areas B) muscle weakness or paralysis C) decreased sympathetic response D) all of the above

all of the above

The dorsal and ventral roots of spinal segments L2 to S5 and the filum terminale together form a complex called the: A) lumbar enlargement. B) conus medullaris. C) cauda equina. D) spinal nerve.

cauda equina.

Motor commands are conveyed to the spinal cord by which of the following? A) descending tracts B) posterior white column C) ascending tracts D) dorsal root

descending tracts

Which efferent nerve is involved in the anal reflex? A) pudendal nerve B) genitofemoral nerve C) tibial nerve D) musculocutaneous nerve

pudendal nerve

Which nerve of the brachial plexus arises from the posterior cord? A) median nerve B) radial nerve C) musculocutaneous nerve D) ulnar nerve

radial nerve

Sweat glands receive instructions through the ventral and dorsal rami of spinal nerves. The neurons carrying these messages are _____ motor fibers, and their cell bodies are found in the __________. A) somatic; spinal cord B) visceral; sympathetic ganglion C) somatic; sympathetic ganglion D) visceral; spinal cord

visceral; sympathetic ganglion