Chapter 13 (2)

• The components of the reflexes

  somatic receptor, afferent nerve fiber, integration center, efferent nerve fiber, effectors
• Somatic receptor


  Sensory receptors pick up stimulus in the skin, muscle, and tendons
• Afferent nerve fibers


  carry information from receptors to posterior horn of spinal cord or the brainstem
• Integrating center


  determines whether efferent neurons issue signal to muscles
• Efferent nerve fibers


  carry motor impulses to muscles
• Effectors


  the muscles that carry out the response
• Cervical plexus


  phrenic nerve
• Brachial plexus


  median, radial, and ulnar nerves
• Lumbar plexus


  femoral and obturator nerves
• Sacral plexus


  sciatic nerve
• the sciatic nerve is made up of

  tibial nerve and common fibular nerve