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 (B)</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 (C)</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 (B)</p> Signup and view all the answers

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

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

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

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

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

<p>Motor neurons (C)</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 (B)</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 (B)</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 (A)</p> Signup and view all the answers

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

<p>Medulla (A)</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 (B)</p> Signup and view all the answers

Where are somatosensory pathways found within?

<p>Funiculi (C)</p> Signup and view all the answers

What is the function of spinal reflexes?

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

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

<p>Inferior to L1 vertebra (C)</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 (D)</p> Signup and view all the answers

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

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

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

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

How do spinal nerves exit the vertebral column?

<p>Via intervertebral foramen (C)</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 (B)</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 (D)</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 (D)</p> Signup and view all the answers

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

<p>Anterior and lateral funiculi (B)</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 (A)</p> Signup and view all the answers

Where does the lateral corticospinal tract decussate?

<p>Medulla (B)</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 (C)</p> Signup and view all the answers

Where does the rubrospinal tract originate?

<p>Midbrain (A)</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 (B)</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 (B)</p> Signup and view all the answers

Which nerve innervates the diaphragm?

<p>Phrenic nerve (C)</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 (B)</p> Signup and view all the answers

Which nerve is responsible for innervating the deltoid muscle?

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

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

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

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

<p>Radial nerve (B)</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 (A)</p> Signup and view all the answers

Which is NOT a main nerve plexus?

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

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