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