WorksheetsUpper Motor Neuron Control of the Brain and Spinal Cord
Total questions: 13
Worksheet time: 6mins
A 45-year-old woman presented to the neurology clinic with complaints of weakness and impaired fine motor control in her left hand following a stroke. Neurological examination revealed muscle weakness and loss of dexterity in her left upper extremity, particularly affecting her ability to grasp and manipulate objects. Which region of the primary motor cortex was likely damaged in this patient?
A
B
C
D
Mirror motor neurons are stimulated by what?
By excessive stretching of muscles
By excessive contraction of muscles
Stimulation of the somatosensory cortex of the parietal lobe
Stimulation of the primary motor cortex of frontal lobe
Lower motor neurons responsible for posture and locomotion are found in the _______ and primarily receive input from upper motor neurons in the _______.
medial ventral horn; brainstem
lateral ventral horn; brainstem
medial ventral horn; cerebral cortex
lateral ventral horn; cerebral cortex
medial dorsal horn; brainstem
At which level of the nervous system does pyramidal decussation occur?
Cerebral cortex
Midbrain
Pons
Medulla
Spinal cord
What percentage of pyramidal tract fibers decussate to form the lateral corticospinal tract?
10%
25%
50%
75%
90%
A man is rushed to the hospital after he has had a stroke involving his left middle cerebral artery. The man will likely lose his ability to
raise both eyebrows.
raise the right corner of his mouth.
squint.
push his tongue into his left cheek.
furrow his brow.
Which of the following body areas listed has the greatest area of motor cortex devoted to it?
Neck
Lips
Wrist
Knee
Brow
The vestibulospinal tract would play a role in which of the following activities?
Contracting your abdominal muscles as you tackle an opponent in football.
Shifting your weight to your right leg before you raise your left leg.
Extending your arms to protect yourself after you trip.
Contracting muscles in your left leg as you take a step with your right leg.
Contracting your triceps as you do a push up.
Within the spinal cord, the neurons that innervate the proximal muscles are more ___ in the spinal cord, whereas the neurons innervating distal muscles are more ___.
Lateral descending motor tracts in the spinal cord are responsible for ___ whereas medial tracts aid in ___.
involuntary muscle contracts and posture/balance
Corticospinal tracts are responsible for ___ whereas corticobulbar axons are responsible for ___.
True or false: Amount of fine motor control required of the musculature is proportional to the amount of motor cortex devoted to it.
What roles do Cingulate motor areas perform?
