Ch 13 The spinal cord, spinal nerves and spinal reflexes Flashcards
Which of the following is not a reasonable reflex response may fail during a clinical
The person may be elderly and no longer have any reflexes
The white matter of the spinal cord is painely
Myelinated axons
The neural wiring of a single reflex is called
Reflex arc
The spinal cord consists of four regions and 31 pairs of
Spinal nerves
Nerve plexuses are formed by interconnecting branches of the
Anterior rami
The post ganglionic fibers that innervate glands in the body wall or smooth muscle and limbs are
Gray rami communicantes
The specialized membranes that surround the spinal cord are termed the
Spinal meninges
In the condition. A virus infects posterior root ganglia causing a painful rash whose distribution corresponds to that of the affected sensory nerves as seen in their dermatomes
Shingles
If the posterior root of a spinal nerve is severed
Sensory input would be blocked
The largest peripheral nerve is the
Sciatic nerve
The subdural space lies between
The dura matter and the arachnoid matter
Reflexes that activate muscles on the same side of the body as the stimulus are called
Ipsilateral
Cerebrospinal fluid flows within the
Subarachnoid space
In which plexus does the ulnar nerve arises
Brachial
If a person has a crush injury in the C3 -C5 spinal segments you would expect that he
Might be unable to breath on his own
Spinal nerves are
Both sensory and motor
The layer of the meninges in direct contact with the spinal cord is the
Pia matter
The anterior rami of spinal nerves C5 to T1 contribute fibers to the
Brachial plexus
The spinal cord extends from the foramen magnum of the skull to the first or second lumbar vertebra, where it terminates in the __________.
conus medullaris
In cross section, the __________ matter of the spinal cord looks like a butterfly or the letter H.
gray
Fiber tracts conducting impulses to the brain are called ascending or __________ tracts.
sensory
The ventral rami of all spinal nerves except T2 through T12 form complex networks of nerves known as __________.
plexuses
The femoral nerve is the largest nerve from the sacral plexus
false
Why is a reactivated varicella-zoster virus (VZV) infection so painful?
Afferent nerve fiber pathways are affected
This extension of one of the meninges covering the spinal cord attaches it to the coccyx.
filum terminale
The meninges that cover the spinal cord from outermost to innermost are ________
dura mater, arachnoid mater, pia mater
There are ________ enlargements of the spinal cord.
2
There are ________ pairs of cervical spinal nerves and ________ pairs of lumbar spinal nerves.
8 and 5
These horns of the spinal cord are present only in the thoracic and lumbar regions.
lateral
This nerve of the brachial plexus supplies all the extensor muscles of the upper limb.
radial
What functional type of neuron is found in the dorsal root ganglion?
sensory
These ascending (sensory) tracts are the most lateral ones between the dorsal and ventral roots of the spinal cord.
spinocerebellar tracts
Ventral roots of spinal nerves are purely or primarily ________.
motor
The ventral rami of spinal nerves ________ form the major nerve plexuses.
C1 through T1 and L1 through S4
Transection of the dorsal roots of spinal nerves C5 through T1 results in ________.
loss of sensation in the upper limb on the same side of the body
The following represents a collection of spinal nerve roots hanging from the inferior end of the spinal cord.
cauda equina
The odd tingling sensation that you experiences when you hit the funny bone is due to trauma to the ________ nerve.
ulnar
