Coverings of Spinal Cord as Seen on Cross Section of a Spinal Nerve
|A View of the Spinal Cord From the Back|
The conus medullaris is the pointed end of the spinal cord and is located at L1 - L2 vertebral level of the vertebral column.
The cauda equina (horses tail) is made up of the dorsal and ventral rami of spinal nerves and the filum terminale. The spinal nerves are traveling toward the sacral foraminae. The filum terminale is a continuation of the pia mater from the terminal part of the spinal cord. It fuses with sacral vertebrae.
Because the spinal cord terminates at L1 - L2, the subarachnoid space can be entered here and not damage the spinal cord. This is where a spinal tap is performed. A needle is pushed into this area and the CSF (cerebrospinal fluid) can be removed for examination. The pressure of the CSF can also be tested here.
Trauma can produce bleeding into the above mentioned spaces and may be dangerous. An extradural hemorrhage is one that fills the space around the dura and can be reached relatively easily.
A subdural hemorrhage is one in which blood forces itself between the dura and arachnoid.
A subarachnoid hemorrhage is one found within the subarachnoid space and tints the cerebrospinal fluid. To check for this, a spinal tap can be performed and the fluid examined for red blood cells.
|Intrinsic Muscles of the Back||Summary List of Upper Limb & Back|
|This is copyrighted© 1999 by Wesley Norman, PhD, DSc|