Editing Epidural space (section)

== Spinal epidural space ==
In the [[spinal canal]], the periosteal layer adheres to the inner surface of the spinal canal which is formed by the bodies of [[vertebra]]e. The meningeal layer lays over the spinal arachnoid mater.<ref name=":1" /> Between the vertebrae and the dural sheath is the '''spinal epidural space'''. Unlike the cranial epidural space, the spinal epidural space contains [[adipose tissue]], the [[internal vertebral venous plexuses]] and the spinal nerve roots.<ref name=":0" /> The spinal epidural space spans the length of the spinal cord, from the [[foramen magnum]] superiorly to the [[sacral hiatus]] inferiorly.<ref name="Moore-20112">{{cite book |last1=Moore |first1=Keith L. |title=Essential Clinical Anatomy |last2=Dalley |first2=Arthur F. |last3=Agur |first3=Anne M. R. |publisher=Lippincott Williams & Wilkins |year=2017 |isbn=978-1496347213 |pages=132}}</ref>

Epidural space is the smallest at the cervical region, measuring 1 to 2 mm. At L2 to L3, enlarges until 5 to 6 mm. It then enlarges progressively until lower lumbar and sacral region.<ref>{{cite book |last1=Mathis |first1=JM |last2=Golovac |first2=S |title=Image Guided Spine Interventions |date=2010 |publisher=Springer Science & Business Media |isbn=9781441903518 |page=14 |url=https://books.google.com/books?id=3DJVAElCmQYC |access-date=5 March 2022}}</ref> However, some authors stated that it decreases in size after mid-lumbar region until 2 mm at S1 level.<ref name="pmid16868616">{{cite journal | vauthors = Botwin KP, Natalicchio J, Hanna A | title = Fluoroscopic guided lumbar interlaminar epidural injections: a prospective evaluation of epidurography contrast patterns and anatomical review of the epidural space | journal = Pain Physician | volume = 7 | issue = 1 | pages = 77–80 | date = January 2004 | pmid = 16868616 | doi = 10.36076/ppj.2004/7/77| url = | doi-access = free }}</ref>