Anterior median fissure of spinal cord

The anterior median fissure of the spinal cord is a deep midline groove of the anterior spinal cord.^[1]: 486 It divides the white matter of the anterior spinal cord nearly in two.^[1]: 487 The spinal pia mater extends into the fissure to line the surfaces of the spinal cord.^[1]: 453

Anterior median fissure of spinal cord
A spinal nerve with its anterior and posterior roots.
Transverse section of the spinal cord in the mid-thoracic region.
Details
Identifiers
Latin	fissura mediana anterior medullae spinalis
TA98	A14.1.02.007
TA2	6053
FMA	83735
Anatomical terminology [edit on Wikidata]

Anatomy

It has an average depth of about 3 mm, but this is increased in the lower part of the spinal cord. It contains a double fold of pia mater. Its floor is formed by a transverse band of white matter - the anterior white commissure - which is perforated by blood vessels on their way to or from the central part of the spinal cord.^{[citation needed]}

Relations

The anterior median fissure provides a groove in which the anterior spinal artery sits.^{[citation needed]}

Clinical significance

Imaging

The anterior median fissure may be identified on computerized tomography (CT) myelograms, but more commonly on magnetic resonance imaging (MRI) scans. The AMF has a characteristic appearance on MRI scans that differs from the MRI appearance of the central canal.^{[citation needed]}

Additional images

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  Diagrams of the medulla spinalis.

References

This article incorporates text in the public domain from page 752 of the 20th edition of Gray's Anatomy (1918)

Tomsick T, Peak E, Wang L: Fluid-Signal Structures in the Cervical Spinal Cord on MRI: Anterior Median Fissure vs. Central Canal. AJNR 2017; 38:840–45

Oichi Y, Hanakita J, Takahashi T, Minami M, Kawakoa T, et al.: Morphological patterns of the anterior median fissure in the cervical spinal cord evaluated by computed tomography after myelography. Neurospine 2018; 15:388-393

Tomsick T, Wang L, Zuccarello M, Ringer AJ. Fluid-signal structures in the cervical spinal cord on MRI in Chiari patients: Central canal or anterior median fissure? AJNR Am J Neuroradiol. 2021 Apr;42(4):801-806. doi: 10.3174/ajnr.A7046. Epub 2021 Mar 11.PMID 33707286