Sacral hiatus

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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	p.107

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

External links

back_bone30 at the University of Michigan Health System - "The Back, Posterior View"
43:os-0117 at the SUNY Downstate Medical Center - "The Female Pelvis: Sacrum"

Bones of torso (TA A02.2,3, GA 2.96–128)

Vertebra

General structures	body of vertebra vertebral arch (pedicle, lamina, vertebral notch) foramina (vertebral, intervertebral) processes (transverse, articular/zygapophysis, spinous) spinal canal

Cervical vertebrae	Uncinate process of vertebra Transverse foramen Anterior tubercle Carotid tubercle Posterior tubercle C1 (lateral mass, anterior arch, posterior arch) C2 (dens) C3, C4, C5, C6 C7

Thoracic vertebrae	T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12 costal facets (superior, inferior, transverse) Uncinate process of vertebra

Lumbar vertebrae	L1, L2, L3, L4, L5 processes (accessory, mammillary)

Sacrum	Base: sacral promontory ala of sacrum Lateral surface: sacral tuberosity pelvic surface (anterior sacral foramina) Dorsal surface: posterior sacral foramina median sacral crest medial sacral crest lateral sacral crest sacral canal (sacral hiatus)

Coccyx	Coccygeal cornu

Thoracic skeleton

Rib	specific ribs (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, True ribs, False ribs, Floating rib) parts (Angle, Tubercle, Costal groove, Neck, Head)

Sternum	Suprasternal notch Manubrium Sternal angle Body of sternum Xiphisternal joint Xiphoid process

Thoracic cage	Superior thoracic aperture Inferior thoracic aperture Intercostal space Costal margin Infrasternal angle

M: BON/CAR

anat (c/f/k/f, u, t/p, l)/phys/devp/cell

noco/cong/tumr, sysi/epon, injr

proc, drug (M5)

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Sacral hiatus

See also

External links