RHSC 420 Midterm Questions with Correct Answers
What are the two enlargements of the spinal cord? - Answer-Cervical and lumbosacral (correspond with the plexuses)
What structures function to stabilize the spinal cord? - Answer-The filum terminale (caudally)
Denticulate ligaments (laterally)
...
RHSC 420 Midterm Questions with
Correct Answers
What are the two enlargements of the spinal cord? - Answer-Cervical and lumbosacral
(correspond with the plexuses)
What structures function to stabilize the spinal cord? - Answer-The filum terminale
(caudally)
Denticulate ligaments (laterally)
What are some of the distinguishing features of the cervical spinal cord in cross
section? - Answer-Largest amount of white matter (many neurons traveling from lower
down)
What are some of the distinguishing features of the thoracic spinal cord in cross
section? - Answer-Least amount of grey matter in the anterior horns (only suppling
motor innervation to the ribs)
Presence of a lateral horn (sympathetic)
What are some of the distinguishing features of the lumbar spinal cord in cross section?
- Answer-Largest amount of grey matter (lumbosacral plexus)
Large anterior horns
Less white matter
What are the three main functions of the spinal cord? - Answer-Conduit (pathway)
Reflexes (stretch, myotatic, withdrawal)
Locomotion (CPG's)
What type of information does fasciculus gracilis handle? - Answer-discriminative touch,
pressure, vibration and proprioception from the lower limb
What type of information does fasciculus cuneatus handle? - Answer-discriminative
touch, pressure, vibration and proprioception from the upper limb
What type of information does the spinocerebellar tract deal with? - Answer-
unconscious proprioception from the limbs
What type of information is transmitted through the spinothalamic tract? - Answer-
Sensory, Pain and temperature
, What is the general trend of somatotropic organization within the spinal cord? - Answer-
The cervical parts tend to be closer to the grey matter
What part of the internal capsule does the corticospinal tract travel through within the
brain? - Answer-The posterior limb
Where do the corticospinal tracts originate? - Answer-Primary motor cortex
Where do motor fibers travel within the brain stem? - Answer-Anteriorly
What tract is the superior colliculus associated with? - Answer-The tectospinal tract
(moves our head and neck towards things that interest us)
What is the function of the vestibulospinal tract? - Answer-Compensating for balance
What determines muscle tone? - Answer-Activity of the muscle spindle
Activity of y-motor neurons (reticulospinal tract, lateral vestibulospinal tract)
What is a y-motor neuron? - Answer-Also known as a gamma neuron, a LMN involved
in muscle contraction. Keeps the muscle spindles taut, facilitating contraction of alpha
motor neurons
Corticospinal tract - Answer-Voluntary movements of the extremities and postural
stability (lateral and anterior)
Vestibulospinal tract - Answer-Maintaining balance, postural control, muscle tone
Reticulospinal tract - Answer-Postural control, muscle tone
Tectospinal tract - Answer-Directing eyes and head/neck towards objects that interest
us
Where do the vestibulospinal, reticulospinal and tectospinal tracts originate? - Answer-
In the brain stem
What are CPG's (locomotion)? - Answer-Automated sequence of motor neuron
activation to allow for locomotion: generation of repetitive cycles of flexor and extensor
activation
True or false: adaptability of gait happens at the level of the spinal cord - Answer-True
(outsourced)
What type of paralysis occurs with an upper motor neuron lesion? - Answer-Spastic
paralysis
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