Myotomes
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Myotomes

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Questions and Answers

Which one of these best describes myotomes?

  • A combination of history, physical exam findings, imaging, and electrodiagnostic study
  • A condition that causes compression of the exiting nerve roots
  • A map of motor (muscle) innervations by the spinal nerve roots (correct)
  • A map of sensory innervations supplied by the spinal nerve roots

    • What is the most common cause of cervical radiculopathy?

  • Osteophytes on the surrounding vertebral bone
  • Spondylolisthesis
  • Herniated intervertebral disk (correct)
  • Foreign body (shrapnel)

    • How is cervical radiculopathy diagnosed?

  • By electrodiagnostic study (correct)
  • By physical exam findings
  • By a combination of history
  • By imaging

    • Between which vertebral bodies does the C4 nerve root exit?

    <p>C3/C4</p> Signup and view all the answers

    Which finger(s) may experience tingling and numbness in a C8 radiculopathy?

    <p>4th and 5th finger</p> Signup and view all the answers

    What is the difference between cervical disk herniation and cervical radiculopathy?

    <p>Cervical disk herniation may not be symptomatic until it presses on a neural structure such as a nerve root</p> Signup and view all the answers

    What is the difference between cervical disk herniation and cervical spinal stenosis?

    <p>Cervical spinal stenosis is a narrowing of the central canal and the neural foramen</p> Signup and view all the answers

    What are dermatomes?

    <p>A map of sensory innervations supplied by the spinal nerve roots</p> Signup and view all the answers

    Which nerve root exits between C7/T1 vertebral bodies?

    <p>C8</p> Signup and view all the answers

    Which condition is characterized by symptoms in multiple and/or bilateral nerve root distributions, often accompanied by cord compression?

    <p>Cervical spinal stenosis</p> Signup and view all the answers

    What is the gold standard for confirming the diagnosis of cervical radiculopathy and cervical spinal stenosis?

    <p>MRI</p> Signup and view all the answers

    Which condition may result in pain and sensory changes in a dermatomal pattern with or without motor weakness in a myotomal pattern?

    <p>Cervical radiculopathy</p> Signup and view all the answers

    What symptom is often worse with neck extension in patients with cervical radiculopathy and cervical spinal stenosis?

    <p>All of the above</p> Signup and view all the answers

    Which condition is characterized by asymptomatic or local pain?

    <p>Disk herniation</p> Signup and view all the answers

    What is the term used to describe the narrowing of the spinal canal due to a protruding or herniated disk?

    <p>Cervical spinal stenosis</p> Signup and view all the answers

    Which condition may be accompanied by cord compression (myelopathy)?

    <p>Cervical spinal stenosis</p> Signup and view all the answers

    What is the term used to describe a test that can worsen sensory symptoms (pain, tingling, numbness) with neck extension?

    <p>Spurling's test</p> Signup and view all the answers

    Which imaging technique is considered the gold standard for confirming the diagnosis of cervical radiculopathy and cervical spinal stenosis?

    <p>MRI</p> Signup and view all the answers

    Which condition can progress to spinal stenosis if the disk protrudes or herniates far enough to cause significant narrowing of the spinal canal?

    <p>Disk herniation</p> Signup and view all the answers

    Study Notes

    Cervical Radiculopathy and Spinal Stenosis

    • Myotomes are a group of muscles that receive innervation from a single nerve root.
    • The most common cause of cervical radiculopathy is a herniated disk or degenerative changes in the spine.
    • Cervical radiculopathy is diagnosed through a combination of physical examination, medical history, and imaging studies such as MRI or CT scans.

    Nerve Roots and Dermatomes

    • The C4 nerve root exits between the C3 and C4 vertebral bodies.
    • The C8 nerve root is associated with tingling and numbness in the pinky finger.
    • Dermatomes are areas of skin that receive sensory innervation from a single nerve root.
    • The nerve root that exits between the C7/T1 vertebral bodies is T1.

    Cervical Disk Herniation and Spinal Stenosis

    • Cervical disk herniation refers to a condition where the disk protrudes or bulges, putting pressure on the nerve root.
    • Cervical radiculopathy is a condition where the nerve root is compressed or irritated, resulting in pain and sensory changes.
    • Cervical spinal stenosis is a condition where the spinal canal is narrowed, putting pressure on the spinal cord.

    Diagnosis and Imaging

    • The gold standard for confirming the diagnosis of cervical radiculopathy and cervical spinal stenosis is an MRI.
    • The term used to describe the narrowing of the spinal canal due to a protruding or herniated disk is spinal stenosis.
    • The Spurling's test is a test that can worsen sensory symptoms (pain, tingling, numbness) with neck extension.

    Clinical Presentation

    • Cervical radiculopathy may result in pain and sensory changes in a dermatomal pattern with or without motor weakness in a myotomal pattern.
    • Symptoms are often worse with neck extension in patients with cervical radiculopathy and cervical spinal stenosis.
    • Cervical disk herniation may be characterized by asymptomatic or local pain.
    • Cervical spinal stenosis may be accompanied by cord compression (myelopathy).

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    Description

    Test your knowledge on myotomes, dermatomes, and cervical radiculopathy in this quiz. Learn about the mapping of motor and sensory innervations, as well as the causes and diagnosis of cervical radiculopathy.

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