Base of the sacrum

Base of the sacrum
Base of sacrum.
Details
Identifiers
Latin	Basis ossis sacri
Dorlands /Elsevier	b_05/12179220
TA	A02.2.05.002
FMA	31722
*Anatomical terms of bone* [edit on Wikidata]

The base of the sacrum, which is broad and expanded, is directed upward and forward.

In the middle is a large oval articular surface, the upper surface of the body of the first sacral vertebra, which is connected with the under surface of the body of the last lumbar vertebra by an intervertebral fibrocartilage.

Behind this is the large triangular orifice of the sacral canal, which is completed by the laminae and spinous process of the first sacral vertebra.

The superior articular processes project from it on either side; they are oval, concave, directed backward and medialward, like the superior articular processes of a lumbar vertebra.

They are attached to the body of the first sacral vertebra and to the alae by short thick pedicles; on the upper surface of each pedicle is a vertebral notch, which forms the lower part of the foramen between the last lumbar and first sacral vertebrae.

On either side of the body is the ala of sacrum.

References

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

External links

Bones of torso

Vertebrae

General structure	Body Arch pedicle lamina notch Vertebral foramen Intervertebral foramina Processes transverse articular spinous Spinal canal

Cervical vertebrae	Uncinate process of vertebra Transverse foramen Anterior tubercle Carotid tubercle Posterior tubercle Atlas lateral mass anterior arch posterior arch Axis dens Vertebra prominens

Thoracic vertebrae	Costal facets superior inferior transverse Uncinate process of vertebra

Lumbar vertebrae	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

Thorax

Rib cage	Ribs true ribs false ribs floating ribs Parts angle tubercle costal groove neck head

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

Thoracic cage	Thoracic inlet Thoracic outlet Intercostal space Costal margin Infrasternal angle

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