Dermatomes and Nerve Plexuses Quiz
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Questions and Answers

What is the main function of the spinal cord and spinal nerves?

  • Relaying sensory input from the brain to the body (correct)
  • Controlling the functions of internal organs
  • Relaying motor output from the body to the brain
  • Providing a link between the brain and the torso only
  • Which chapter of the textbook provides information about the protective structures of the spinal cord?

  • Chapter 13 (correct)
  • Chapter 15
  • Chapter 14
  • Chapter 16
  • What are dermatomes?

  • Structures that protect the spinal cord
  • Components of a reflex arc
  • Main nerves in each nerve plexus
  • Specific areas of skin innervated by particular nerves (correct)
  • Which type of reflex is responsible for quickly pulling your hand away from a hot object?

    <p>Flexor reflex</p> Signup and view all the answers

    What is the main difference between direct and indirect motor pathways?

    <p>Direct pathways synapse directly with motor neurons, while indirect pathways synapse with interneurons first</p> Signup and view all the answers

    Which type of pathway distinguishes between fine touch, pressure, and vibration sensations?

    <p>Dorsal column-medial lemniscal pathway</p> Signup and view all the answers

    Damage to which nerve plexus can result in difficulty moving the shoulder and arm?

    <p>Brachial plexus</p> Signup and view all the answers

    Which reflex arc is responsible for maintaining muscle tone and adjusting it reflexively?

    <p>Stretch reflex</p> Signup and view all the answers

    Which type of neurons relay motor output from the brain to effectors?

    <p>Motor neurons</p> Signup and view all the answers

    How many neurons are typically involved in transmitting nerve signals from sensory receptors to the brain in sensory pathways?

    <p>Two neurons</p> Signup and view all the answers

    In which part of the body is the primary (first-order) neuron located in the sensory pathways?

    <p>Brainstem or spinal cord</p> Signup and view all the answers

    Which somatosensory pathway provides information about pain, temperature, touch, and pressure for conscious interpretation?

    <p>Anterolateral (Spinothalamic) pathway</p> Signup and view all the answers

    Where does decussation occur in the Posterior column medial-lemniscus pathway?

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

    What is the function of the Secondary (second-order) neuron in sensory pathways?

    <p>Extend from the primary neuron to the thalamus</p> Signup and view all the answers

    Where are somatosensory pathways found within?

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

    What is the function of spinal reflexes?

    <p>Initiate quick reactions to stimuli</p> Signup and view all the answers

    Where does the spinal cord end in relation to the vertebrae?

    <p>Inferior to L1 vertebra</p> Signup and view all the answers

    What is the function of the vertebral foramina?

    <p>Form the vertebral canal to protect the spinal cord</p> Signup and view all the answers

    Which meninx directly adheres to the external surface of the spinal cord?

    <p>Pia mater</p> Signup and view all the answers

    Where is cerebrospinal fluid (CSF) located in relation to the arachnoid mater?

    <p>Within the subarachnoid space</p> Signup and view all the answers

    How do spinal nerves exit the vertebral column?

    <p>Via intervertebral foramen</p> Signup and view all the answers

    What is the purpose of a lumbar puncture (spinal tap)?

    <p>To sample cerebrospinal fluid for diagnostic purposes</p> Signup and view all the answers

    What is the relationship between spinal cord meninges and cranial meninges?

    <p>They are continuous with each other</p> Signup and view all the answers

    What type of information does the spinocerebellar pathway provide for subconscious interpretation?

    <p>Information about body position and body movements</p> Signup and view all the answers

    Where are the motor tracts that comprise motor pathways typically found?

    <p>Anterior and lateral funiculi</p> Signup and view all the answers

    Which tract innervates axial skeletal muscles like those in the trunk, neck, and shoulders?

    <p>Anterior corticospinal tract</p> Signup and view all the answers

    Where does the lateral corticospinal tract decussate?

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

    Which type of pathway involves only two motor neurons: one upper motor neuron and one lower motor neuron?

    <p>Direct pathways</p> Signup and view all the answers

    Where does the rubrospinal tract originate?

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

    What is the function of the rubrospinal tract?

    <p>Regulates and controls fine, precise, voluntary movements in the distal parts of the upper limbs mainly</p> Signup and view all the answers

    What is the role of the upper motor neuron in motor pathways?

    <p>First neuron in the chain of neurons</p> Signup and view all the answers

    Which nerve innervates the diaphragm?

    <p>Phrenic nerve</p> Signup and view all the answers

    What happens when a dermatome is innervated by more than one spinal nerve?

    <p>Sensation will not be affected if one of the nerves supplying the dermatome is damaged</p> Signup and view all the answers

    Which nerve is responsible for innervating the deltoid muscle?

    <p>Axillary nerve</p> Signup and view all the answers

    Which plexus does not form on both sides of the body?

    <p>Lumbar plexus</p> Signup and view all the answers

    Which nerve innervates the muscles that extend the wrist in the posterior forearm?

    <p>Radial nerve</p> Signup and view all the answers

    What is the function of the median nerve in the brachial plexus?

    <p>Innervates most of the anterior forearm muscles</p> Signup and view all the answers

    Which is NOT a main nerve plexus?

    <p>Thoracic plexus</p> Signup and view all the answers

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