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.
