A total of 31 pairs of spinal nerves attaches to the spinal…
A total of 31 pairs of spinal nerves attaches to the spinal cord. They are named according to the region of the vertebral column and the specific vertebrae with which they are associated: 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygeal. Each spinal nerve originates with a paired series of posterior and anterior rootlets, which attach to the posterolateral and anterolateral sulci (grooves) of the spinal cord, respectively, and extend the whole length of the corresponding segment of the cord. Each paired bundle of posterior and anterior rootlets joins together and forms a single posterior and anterior root within the vertebral canal. Each paired posterior and anterior root merges within an intervertebral foramen (IVF) and forms an individual spinal nerve. Each posterior root possesses a posterior root ganglion, which is locate at the IVF. The spinal nerve passes through the IVF and immediately divides into a smaller posterior ramus and a larger anterior ramus. The anterior ramus divides into medial and lateral branches, which distribute to the back. The anterior ramus distributes initially to more lateral and anterior regions. Using this passage, (1) produce a flow diagram from the spinal cord to the back. Then (2) do the same for the steps from the spinal cord to the front and sides of the body. Note the vocab and flow diagrams may overlap. (3) We talked about the IVF in lab. Describe how this space is formed and it’s relation to the spinal nerves. If you don’t remember, remember that foramen means opening and use the prefixes and suffixes to help you interpret how it might be formed.
Read DetailsRead the following passage and then answer the following que…
Read the following passage and then answer the following questions. “Lumbar Puncture is a clinical procedure designed to insert the needle into the subarachnoid space in the low lumbar region. The purpose may be to withdraw a sample of cerebrospinal fluid for examination, administer anesthetic, or inject a radiographic medium. The large interlaminar spaces between the low lumber vertebrae afford relatively open access to the vertebral canal. In adults. the spinal cord terminates inferiorly at the level of the T12 to L3 vertebrae. In infants, the cord ends at about the L3 vertebra. Thus, puncture inferior to the L3 vertebra minimizes the possibility of impaling the spinal cord. The lower lumbar part of the vertebral canal (inferior to L3) contains the cauda equina floating within the large subarachnoid space (lumbar cistern). Thus, a sizable pool of cerebrospinal fluid is available in this region. Also, a needle introduces into the lumbar cistern usually pushes the nerve roots to one side without causing damage.” Give three reasons that the lumbar is a good region to puncture for access to the spine and explain as if to a new student. Based on context clues, what is the lumbar cistern?
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