The cauda equina, from the Latin for “a horse’s tail”, is a slender series of lumbar, sacral and coccygeal nerves eminating from the lumbar-enlarged caudal spinal cord. Implicated in the medical emergency cauda equina syndrome (CES), its anatomy is touched upon in this quiz. Best of luck!
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Clinical Neuroanatomy: Part Five
1) is involved in flexor muscle control, 2) in extensor muscle control
1) is involved in extensor muscle control, 2) in flexor muscle control
1) is involved in flexor muscle control, 2) in flexor muscle control
1) is involved in extensor muscle control, 2) in extensor muscle control
1) and 2) are involved in neither flexor or extensor muscle control
The primary motor cortex
The premotor cortex
The supplementary motor cortex
The primary somatosensory cortex
The prefrontal cortex
Stem 1 of 4Study the image below to answer the following questions
Region "A" contains axons with which best-fitting function?
Extensor muscle control
Anti-gravity muscle control
Flexor muscle control
Minor motor movement
Major, voluntary and skilled motor movemenrt
Stem 2 of 4The tract at region "B" would risk an infarct in which of the following cases selectively?
Occlusion of the anterior spinal artery
Occlusion of the right posterior spinal artery
Occlusion fo the left posterior spinal artery
All of the above
None of the above
Stem 3 of 4What is the name of the tract at position "B"?
Ventral corticospinal trsct
Ventral spinocerebellar tract
Anterior spinothalamic tract
None of the above
Stem 4 of 4Which clinical sign would manifest with a selective lesion (eg abscess) to position "C"?
Contralateral flexor weakness
Ipsilateral flexor weakness
Contralateral extensor weakness
Ipsilateral extensor weakness
Loss of fine touch sensation
Increased stretch reflex
Severe muscular atrophy
"A rhythmic oscillation as a result of alternate stretch and unloading of muscle spindles within a spastic muscle belly"
A patient with a history of cerebral infarct has this clinical sign. How is it best elicited?
Periumbilical stroking with a cotton wool piece
Patellar tendon hammer swing
Lightly stroking the superomedial thigh
A firm arc on the sole of the foot
Rapid dorsiflexion about the supported ankle
Interneurons involved in regulation of synaptic output
Interneurons affiliated with the reticulospinal tract neurons
Glycine-rich interneurons controlling lower motor neurons
Implicated in partial gain of function in some spinal cord lesions
A causes of flaccid paralysis when tonic inhibition is added
Free nerve endings
Spotted an error?
With thanks to:
Mysid. (2010). Diagrammatic transverse section of the medulla spinalis and its membranes. Available: https://commons.wikimedia.org/wiki/File:Gray770-en.svg. Last accessed 27th October 2019.