A&P ONE CHAPTER 13

Spinal nerves C5-T1 make up the ____________ plexus. sacral lumbar brachial cervical radial

brachial

Spinal nerves exiting the cord from the level of L4 to about S4 form the lumbar plexus. femoral plexus. sacral plexus. pelvic plexus. brachial plexus.

sacral plexus.

The cutaneous sensory distribution of a spinal nerve can be mapped as a dermatome. plexitome. microtome. myotome. superdome.

dermatome.

Damage to the phrenic nerve would result in the loss of motor activity in the arms. an increased heart rate. an inability to swallow. difficulty breathing. a decreased heart rate.

difficulty breathing.

The thickest of the meninges is the pia mater. arachnoid mater. subdural space. subarachnoid space. dura mater.

dura mater.

There are ________ cervical spinal nerves. eight twelve six five

eight

If a withdrawal reflex is initiated in one leg, the crossed extensor reflex causes a withdrawal reflex in the opposite leg. inhibition of abduction in the opposite leg. extension of the opposite leg. both legs to extend. flexion of both legs.

extension of the opposite leg.

Initiating the withdrawal reflex in both legs at the same time would cause one to maintain posture longer. fall. decrease muscle tension. develop resistance in one limb and reduce resistance in the other. hop.

fall.

There are ________ lumbar spinal nerves. eight twelve six five fourteen

five

There are ________ sacral spinal nerves. eight twelve six five fourteen

five

There are ________ thoracic spinal nerves. eight twelve six five fourteen

twelve

There are _____ enlargements of the spinal cord where nerves supplying the extremities enter and leave. two three four five six

two

Put the following parts of a reflex arc in the correct order beginning with the sensory receptor. 1. motor neuron 2. interneuron 3. effector 4. sensory neuron 5. sensory receptor 5, 1, 2, 3, 4 5, 3, 2, 4, 1 5, 4, 3, 2, 1 5, 2, 3, 4, 1 5, 4, 2, 1, 3

5, 4, 2, 1, 3

Label component "A" on the reflex arc. sensory receptor effector organ sensory neuron Correct Response motor neuron interneuron

Label component "A" on the reflex arc. sensory receptor effector organ sensory neuron Correct Response motor neuron interneuron

Label component "B" on the reflex arc. sensory receptor effector organ Correct Response sensory neuron motor neuron interneuron

Label component "B" on the reflex arc. sensory receptor effector organ Correct Response sensory neuron motor neuron interneuron

Label component "C" on the reflex arc. sensory receptor effector organ sensory neuron motor neuron Correct Response interneuron

Label component "C" on the reflex arc. sensory receptor effector organ sensory neuron motor neuron Correct Response interneuron

Label component "D" on the reflex arc. Correct Response sensory receptor effector organ sensory neuron motor neuron interneuron

Label component "D" on the reflex arc. Correct Response sensory receptor effector organ sensory neuron motor neuron interneuron

Label component "E" on the reflex arc. sensory receptor Correct Response effector organ sensory neuron motor neuron interneuron

Label component "E" on the reflex arc. sensory receptor Correct Response effector organ sensory neuron motor neuron interneuron

Which of the following is false? The dorsal root of the spinal cord conveys sensory (afferent) nerve impulses to the spinal cord. The posterior horn of the cord contains the cell bodies of motor neurons. The ventral root is formed by the axons of neurons in the lateral and anterior horns. The dorsal and ventral roots unite to form spinal nerves. The ventral root of the spinal cord conveys motor (efferent) nerve impulses away from the spinal cord.

The posterior horn of the cord contains the cell bodies of motor neurons.

Which of the following statements concerning the structure of spinal nerves is true? The ventral root contains motor or efferent fibers. The ventral root has a prominent root ganglion. Rootlets from the surface of the spinal cord form the dorsal and ventral rami. Each spinal nerve is formed by the union of a cranial nerve and a spinal nerve. Spinal nerves do not have specific cutaneous distributions.

The ventral root contains motor or efferent fibers.

Reflexes are homeostatic. are not homeostatic. are voluntary conscious responses to a stimulus. are integrated in the spinal cord, but not the brain. are integrated in the brain, but not the spinal cord.

are homeostatic.

The epineurium surrounds nerve cell bodies. surrounds individual axons and their Schwann cells. bundles axons into fascicles. bundles fascicles into nerves. bundles fascicles into axons.

bundles fascicles into nerves.

Dermatomal maps are important clinically because they can be used to check for motor function. locate the position of cranial nerves. can be used to help locate nerve damage. indicate what muscles are innervated by each spinal nerve. can be used to detect cranial nerve damage.

can be used to help locate nerve damage.

Which portion of a reflex arc is most likely to be located entirely within the central nervous system? sensory neuron motor neuron effector cell interneuron receptor cell

interneuron

All spinal nerves from C2 to L5 exit the vertebral column through a(n) vertebral foramen. spinal foramen. dorsal root ganglion. intervertebral foramen. foramen magnum.

intervertebral foramen.

The conus medullaris anchors the spinal cord to the coccyx. is a tapered, cone like region immediately inferior to the lumbar enlargement. marks the exit of nerves to the upper extremity. is located adjacent to the foramen magnum. is inferior to the cauda equina.

is a tapered, cone like region immediately inferior to the lumbar enlargement.

The conus medullaris anchors the spinal cord to the coccyx. is a tapered, cone like region immediately inferior to the lumbar enlargement. marks the exit of nerves to the upper extremity. is located adjacent to the foramen magnum. is inferior to the cauda equina.

is a tapered, cone like region immediately inferior to the lumbar enlargement.

The spinal cord controls the reticular activating system. stores reflexive memory. forms memory engrams. links the peripheral nervous system to the brain. is characterized by conscious activity.

links the peripheral nervous system to the brain.

The spinal cord controls the reticular activating system. stores reflexive memory. forms memory engrams. links the peripheral nervous system to the brain. is characterized by conscious activity.

links the peripheral nervous system to the brain.

If the ventral root of a spinal nerve were cut, the regions innervated by that spinal nerve would experience complete loss of sensation. movement. sensation and movement. pain. none of the above

movement.

The sensory receptor of the stretch reflex is the Golgi tendon organ. muscle spindle. dorsal root ganglion. collateral axon. alpha motor neurons

muscle spindle.

Ventral rami of some spinal nerves join with each other to form a ganglion. dermatome. cord. plexus. nerve.

plexus.

The adaptive significance of the crossed extensor reflex when a person steps on a tack is to remove the foot from the tack increase the rate at which withdrawal of the limb occurs slow the rate of removal of the foot from the tack reduce the pain sensations prevent the person from falling down

prevent the person from falling down

The endoneurium surrounds nerve cell bodies. surrounds individual axons and their Schwann cells. bundles axons into fascicles. bundles fascicles into nerves. surrounds nerve tracts in the spinal cord.

surrounds individual axons and their Schwann cells.

The patellar or knee-jerk reflex is a classic example of the Golgi tendon reflex. the withdrawal reflex. the stretch reflex. the crossed extensor reflex. reciprocal innervation.

the stretch reflex.

A reflex that protects limbs by removing them from painful stimuli is the stretch reflex. crossed extensor reflex. Golgi tendon reflex. alternating reflex. withdrawal reflex

withdrawal reflex