1-

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

Spinal nerves C5-T1 make up the ____________ plexus.

brachial

The epineurium

bundles fascicles into nerves.

The cutaneous sensory distribution of a spinal nerve can be mapped as a

dermatome.

There are ________ thoracic spinal nerves.

twelve

There are _____ enlargements of the spinal cord where nerves supplying the extremities enter and leave.

two

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

two

A reflex that protects limbs by removing them from painful stimuli is the

withdrawal reflex

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 "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.

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 "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.

Dermatomal maps are important clinically because they

can be used to help locate nerve damage.

Damage to the phrenic nerve would result in

difficulty breathing.

The thickest of the meninges is the

dura mater.

There are ________ cervical spinal nerves.

eight

If a withdrawal reflex is initiated in one leg, the crossed extensor reflex causes

extension of the opposite leg.

Initiating the withdrawal reflex in both legs at the same time would cause one to

fall.

There are ________ lumbar spinal nerves.

five

There are ________ sacral spinal nerves.

five

Which portion of a reflex arc is most likely to be located entirely within the central nervous system?

interneuron

All spinal nerves from C2 to L5 exit the vertebral column through a(n)

intervertebral foramen.

The conus medullaris

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

The spinal cord

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

movement.

The sensory receptor of the stretch reflex is the

muscle spindle.

Ventral rami of some spinal nerves join with each other to form a

plexus.

The adaptive significance of the crossed extensor reflex when a person steps on a tack is to

prevent the person from falling down

Spinal nerves exiting the cord from the level of L4 to about S4 form the

sacral plexus.

The endoneurium

surrounds individual axons and their Schwann cells.

The patellar or knee-jerk reflex is a classic example of

the stretch reflex.