Sacral hiatus

Bone: Sacral hiatus
	Sagittal section of vertebral canal to show the lower end of the medulla spinalis and the filum terminale.; Li, Lv. First and fifth lumbar vertebra.; SII Second sacral vertebra.; 1. Dura mater.; 2. Lower part of subarachnoid cavity.; 3. Lower extremity of medulla spinalis.; 4. Filum terminale internum.; 5. Filum terminale externum.; 6. Attachment of filum terminale to first segment of coccyx.
	Sacrum, dorsal surface.
Latin	hiatus sacralis
Gray's	subject #24 107
Dorlands; / Elsevier	h_11/12422058

The laminae of the fifth sacral vertebra, and sometimes those of the fourth, fail to meet behind, and thus a sacral hiatus or deficiency occurs in the posterior wall of the sacral canal.

External links

sacral+hiatus at eMedicine Dictionary
Atlas of anatomy at UMich back_bone30 - "The Back, Posterior View"
SUNY Labs 43:os-0117 - "The Female Pelvis: Sacrum"

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

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hu:Hiatus sacralis

Bone: Sacral hiatus

Sagittal section of vertebral canal to show the lower end of the medulla spinalis and the filum terminale. Li, Lv. First and fifth lumbar vertebra. SII Second sacral vertebra. 1. Dura mater. 2. Lower part of subarachnoid cavity. 3. Lower extremity of medulla spinalis. 4. Filum terminale internum. 5. Filum terminale externum. 6. Attachment of filum terminale to first segment of coccyx.

Sacrum, dorsal surface.
Latin	hiatus sacralis
Gray's	subject #24 107
Dorlands / Elsevier	h_11/12422058

v • d • e Bones of torso
Sternum	Suprasternal notch, Manubrium, Sternal angle, Body of sternum, Xiphisternal joint, Xiphoid process
Rib	specific ribs (1, 2, 9, 10, 11, 12, false - 8-12, floating - 11-12) - parts (Angle, Tubercle, Costal groove, Neck, Head)
General vertebral structures	body of vertebra, vertebral arch (pedicle, lamina, vertebral notch), foramina (vertebral, intervertebral), processes (transverse, articular / zygapophysis, spinous)
Cervical vertebrae	C1 (anterior arch, posterior arch, lateral mass), C2 (dens), C3, C4, C5, C6, C7 anterior tubercle, posterior tubercle, foramen transversarium
Thoracic vertebrae	T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12 costal facets (superior, inferior, transverse)
Lumbar vertebrae	accessory process, mammillary process, L5
Sacrum	pelvic surface (anterior sacral foramina), dorsal surface (posterior sacral foramina, median sacral crest, medial sacral crest, lateral sacral crest), lateral surface (sacral tuberosity), base, sacral hiatus - presacral space - sacral promontory - sacral canal - ala of sacrum - sacrovertebral angle

Sacral hiatus

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