Chapter 13 A&P

Which of the following statements is/are incorrect? 1. The epidural space is located between the dura mater and the vertebral canal wall. 2. The subdural space is located between the dura mater and arachnoid mater. 3. The subarachnoid space contains interstitial fluid and is located between the arachnoid mater and pia mater.

3 only

Spinal nerves are not part of the

CNS

Which of the following statements is incorrect? The anterior gray horn, posterior gray horn and lateral gray horns contain myelinated fibers. The anterior and posterior gray horns divide the white matter into columns. The white matter of the spinal cord contains tracts. Sensory tracts carry information to the brain. Motor tracts carry information away from the brain.

The anterior gray horn, posterior gray horn and lateral gray horns contain myelinated fibers.

Which of the following statements is incorrect? In a stretch reflex, the sensory receptors are muscle spindles. The tendon reflex guards against damage to tendons by excessive stretching. The flexor or withdrawal reflex occurs in response to a pleasant stimulus. The crossed extensor would help you to maintain your balance after a flexor reflex.

The flexor or withdrawal reflex occurs in response to a pleasant stimulus.

Which of the following is true concerning spinal nerves? The roots of the cervical nerves form the cauda equina Only the cervical nerves form a plexus The posterior root contains sensory axons All arise in the brain, but exit through intervertebral foramina

The posterior root contains sensory axons

Nerves to and from the upper and lower limbs arise from the cervical and lumbar enlargements.

True

The cell bodies of somatic motor neurons are found in which region of the spinal cord?

anterior horn

The ulnar nerve arises from which plexus?

brachial

If you inserted a needle between the 3rd and 4th lumbar vertebra, you would probably hit the

cauda equina

A bundle of fibers located within the CNS is a

tract

Intercostal nerves directly connect to the structures they supply while plexuses are networks of nerves that supply a general area of the body.

true

Which of these statements is incorrect? The filium terminale arises from the cauda equina. The conus medullaris is located inferior to the lumbar enlargement. Each pair of spinal nerves arises from a spinal segment. The anterior median fissure and the posterior medium sulcus divide the spinal cord into segments.

The filium terminale arises from the cauda equina.

Inside the CNS, sensory impulses are carried in

ascending tract

The phrenic nerve arises from the _____ plexus, and innervates the _____.

cervical and diaphragm

Injury of which nerve causes footdrop?

common fibular

The dorsal root of a spinal nerve...

contains sensory fibers

Inferior to the lumbar enlargement, the spinal cord tapers to a conical portion called the?

conus medullaris

Which of the following reflexes is contralateral?

crossed extensor

Autonomic reflexes involve contraction of skeletal muscles while somatic reflexes involve contraction of smooth muscle, cardiac muscle and glands.

false

What is the largest nerve arising from the lumbar plexus?

femoral

Which of the following nerves arises from the lumbar plexus?

femoral

The spinal cord is held in place by the?

filum terminale and denticulate ligaments

If you step on a tack the reflex that would be initiated is a

flexor reflex

Injury of which nerve could cause paralysis of the serratus anterior muscle?

long thoracic

If the ventral root of a spinal nerve were cut, what would be the result in the region supplied by that nerve?

loss of movement

The connective tissue sheath around a group of neuronal fibers (a fascicle) is called the

perineurium

Which nerve from the cervical plexus causes contraction of the diaphragm?

phrenic

Which of the following nerves arises from the cervical plexus?

phrenic

The innermost covering of the spinal cord is?

pia mater

Which of the following lists the parts of a reflex arc in the correct sequence?

receptor, sensory neuron, association neuron, motor neuron, effector

Pressure from the uterus during pregnancy sometime causes damage to the

sciatic nerve

The dorsal root ganglion contains cell bodies of?

sensory neurons

An example of a monosynaptic reflex pathway is the

stretch reflex

In a diagnostic spinal tap (lumbar puncture) of an adult, a sample of cerebrospinal fluid is removed from the?

subarachnoid space

Which of the following is true concerning the meninges? They line the central canal They filter blood They are hollow spaces in the brain They cover brain and spinal cord

they cover the brain and the spinal cord

Spinal nerves originating from this portion of the cord do not form plexuses

thoracic

Inability to contract the gastrocnemius muscle could indicate damage to the

tibial nerve

Spinal nerves are named and numbered according to the region and level of the vertebral column from which they arise and contain both sensory and motor axons.

true

The posterior and anterior roots of a spinal nerve connect it to the spinal cord.

true

Which branch of a spinal nerve forms the plexuses?

ventral ramus

Which of the following spinal tracts is incorrectly matched? 1. Spinothalamic tract - Descending 2. Lateral corticospinal - Descending 3. Rubrospinal - Ascending 4. Vestibulospinal - Descending

1 and 3 are wrong

Which of the following statements is incorrect? A monosynaptic reflex arc would involve a pathway consisting of a single sensory neuron, and a single motor neuron. If sensory nerve impulses enter the spinal cord on the same side from which motor impulses leave it, the reflex arc is termed contralateral. An intersegmental reflex arc allows stimulation of more than one effector. All of these statements are correct.

If sensory nerve impulses enter the spinal cord on the same side from which motor impulses leave it, the reflex arc is termed contralateral.