Chapter 17: Spinal Cord

• which nerves arise from the brachial plexus 


  ulnar n.

  axillary n.

  radial n.

  median n.

  musculocutaneous n.
• what is the name of the nerve that originates from C3, C4 & C5 roots of the cervical plexus 


  phrenic n.
• what is the largest nerve in the body


  sciatic n.
• which nerve from the cervical plexus causes contraction of the diaphragm 


  phrenic
• the central canal of the spinal cord is located in the center of the :


  gray commissure
• lateral gray horns are present in segments of which of the regions of the spinal cord


  thoracic

  lumbar

  midsacral
• T or F : the two largest branches of a spinal nerve are the anterior ramus and the posterior ramus

  T
• T or F: All spinal nerves are mixed nerves 


  T
• T or F: The outer covering of a spinal nerve is the epinerium 


  T
• T or F: Every pair of spinal nerves exists through the intervertebral foramina above the vertebra that has the same name and number as the nerves 


  F
• Which peripheral nerves are responsible for cutaneous sensation from the skin of the anterior abdominal wall as well as motor innervation to the anterior abdominal wall ms 


  intercoastal (thoracic)nerves
• which contains sensory information ONLY


  posterior (dorsal) root
• a description of the pia mater:


  contains blood vessels that supply oxygen and nutrients to spinal cords
• which muscles are served by the femoral nerve 


  extensor muscles of the knee joint
• what are the two main routes for sensory information traveling up the spinal cord to the brain 


  spinothalamic tracts and posterior funiculi
• which is the correct way of organization of spinal nerves 


  31 pairs of spinal n.

  8 pairs of cervical n.

  12 pairs of thoracic n.

  5 pairs of lumbar n.

  5 pairs of sacral n.

  1 coccygeal n.
• the sense of pain and temperature are conveyed to the brain by: 


  lateral spinothalamic tracts
• motor impulses that help maintain muscle tone and posture are conveyed from the brain to the spinal cord by the:


  indirect pathways
• what is the order of the reflex arc 


  sensory receptor

  sensory neuron

  integrating center

  motor neuron

  effector
• what spinal nerves make up the cauda equina


  lumbar, sacral and coccygeal
• T or F: the sciatic nerve arises from the lumbar plexus 


  F
• T or F: the sciatic nerve is the largest nerve in the body


  T
• T or F: the sciatic nerve sends branches to the hamstring muscles


  T
• T or F: the sciatic nerve splits at about the level of the knee into tibial and common fibular nerves


  T
• Spinal nerves T2-T12 differ from all other spinal nerves in that:

  the anterior rami do not contribute to a plexus
• what is the structure served by the phrenic nerve 


  diaphragm
• what muscles are served by the obturator nerve


  adductor muscles of the thigh
• what muscles are served by the tibial nerve


  gastrocnemius and soleus muscles
• what muscles are served by the inferior gluteal nerve


  gluteus maximus
• from which plexus does the femoral nerve arise


  lumbar
• from which plexus does the phrenic nerve arise


  cervical
• from which plexus does the pudendal nerve arise 


  sacral
• T or F: the anterior median fissure of the spinal cord is shallower and narrower than the posterior median sulcus


  F
• T or F : all segments of the spinal cord contain lateral, posterior and anterior gray horns


  F
• Complete paralysis of the diaphragm occurs if the spinal cord is crushed or destroyed at: 


  just above the C3 region

  above the origin of the phrenic nerves
• the adult spinal cord extends from the

  medulla oblongata inferiorly to the superior border of the second lumbar vertebra
• which contain cell bodies of sensory neurons 


  spinal (posterior root) ganglia
• motor neurons that supply skeletal muscles have cell bodies in 


  anterior gray horns of the spinal cord and their axons will exit the cord vita an anterior root
• the conus medullaris is 


  the tapering end of the spinal cord inferior to the lumbar enlargement
• the inferior extension of the pia mater that anchors the spinal cord to the coccyx is called the


  filum terminale