Chapter 13-The Spinal Cord, Spinal Nerves, And Somatic Reflexes

Chapter 13-Th e Spinal

61 cards   |   Total Attempts: 182
  

Cards In This Set

Front Back
Contains nerve fiber bundles connecting areas of the body with the brain
Conduction
Walking requires repetitive coordinated muscle contractions, brain initiates walking but central pattern generators (groups of neurons) in the spinal cord coordinate it
Locomotion
Involuntary responses to certain stimuli
Reflexes
Arises at brain stem, extends to about L1, gives rise to 31 pairs of spinal nerves, pair 1 between skull and C1, rest through intervertebral foramina, divided into regions (cervical, thoracic, lumbar and sacral)
Spinal Cord
Gives rise to nerves of the upper limbs
Cervical Enlargement
Gives rise to nerves of the pelvic region and lower limbs
Lumbar Enlargement
Just below lumbar enlargement, gives rise to Cauda Equina
Conus Medularis
Bundle of nerve roots occupies vertebral canal from L2 to S5, nerves arising innervate pelvic region and lower extremities
Cauda Equina
3 layers of connective tissue coverings that enclose the brain and spinal cord, brain and spinal meninges are continuous with one another
Meninges of the Spinal Cord
Outermost layer made of dense irregular connective tissue, ends at 2nd sacral vertebrae, epidural space is outside and contains fat, connective tissue, blood vessels, epidural anesthesia
Dura Mater
Middle layer, collagen and elastic fibers, subdural space which contains interstitial fluid between dura & arachnoid layers, subarachnoid space contains the CSF
Arachnoid Mater
Innermost layer, thin layer adheres to brain and spinal cord, contain blood vessels that supply the spinal cord
Pia Mater
Extensions of the pia mater, suspend the cord in the dural sheath, extend laterally attach the pia and dural layers, function to protect the cord against sudden displacement
Denticulate Ligaments
Contains somas, dendrites, proximal axons of neurons, little myelin, contains all synapses in CNS
Gray Matter
Abundance of myelin, composed of bundles of axons called tracts
White Matter