SPINAL CORD/NERVES True and False
The sacral nerve is the longest nerve in the body
False - the sciatic nerves is the longest
Mixed nerve are called mixed because they contain both gray and white matter
False - they are called mixed nerves because they contain both sensory and motor axons
The perineurism and the epineurism connective tissues are both avascular
False, both the perineurism and the epirneurism are vascular and provide nourishment to the spine
A plexus refers to a bundle of rami
False, it is a network of axons
There are ten times more neurons than neuroglia
False, it is the opposite
Motor or efferent nerves transmit the messages from the body receptors to the PNS
False, the motor neurons transmit messages from the CNS to muscles or organs of response
The spinal cord and vertebral column are the same exact length
False, the vertebral column growth continues well past the spinal cord's elongation period (approximately 4 years)
A sympathetic autonomic motor nerve restores to the original state
False, this is the parasympathetic nerve's function; the sympathetic motor nerve responds to the stimulus
A network of axons is called a plexus
True
A reflex has 5 components that include the sensory neuron and the effector
True
An injury to the dorsal roots of the spinal nerves would result in the loss of sensation to all sense receptors
True
The central nervous system is made up of the brain and spinal cord
True
The spinal cord processes motor output differs between the skeletal muscles and the smooth muscles or glands
True
White matter is the outside of the spinal cord (nerve fibers), gray matter is inside the cord (neurons)
True
The lumbar nerve gives rise to the femoral nerve and the trigeminal nerve
False - it only gives rise to the femoral nerve
There are more coccygeal spinal nerves than cervical spinal nerves
False - the coccygeal has one pair, the cervical has 8
The spinal nerves are part of the CNS
False - they are part of the PNS
The phrenic nerve of respiration rises from the brachial plexus
False - it rises from the cervical plexus
Because the phrenic nerve runs alongside the C1-C4 vertebra and supplies the major muscle of respiration, severing the spinal cord at C2 would result in respiratory arrest
True
Glial cells are support cells for the neurons and collectively known as the neuroglia
True
Meninges cover the spinal cord and the nerve roots
True
Much like spinal nerves, plexuses occur in pairs
True
Neurons receive and transmit the body's biochemical information
True
Rootlets are the smallest bundles of axons and form roots (both anterior and posterior) that make up the 31 pairs of spinal nerves
True
Sensory or afferent nerves transmit the messages from the body receptors to the CNS
True
There are 12 pairs of cranial nerves and 31 pairs of spinal nerves
True
There are 5 pairs each of the lumbar and sacral nerves
True
There are five major nerves formed in the brachial plexus and they are the axillary, the musculocutaneous, the radial, the median, and the ulnar
True
There are more thoracic spinal nerves than any other type
True
When the posterior and anterior roots join, they form spinal nerves
True