What is the function of Demifacet?
A demifacet is actually half of a facet and is where part of the head of the rib or part of the costal cartilage articulates and these are usually found on ribs 2 through 9. The superior demifacet of the body of the vertebra receives the head of the rib with the same number as the vertebra of interest.
What is the difference between Demifacet and costal facet?
Costal facets or demifacets are found on the bodies of the vertebrae. The distinction between facet and demifacet (half a facet) rests upon whether the head of the rib articulates on only one body (facet) or overlaps two (demifacet).
What is a full costal facet?
A costal facet is a site of connection between a rib and a vertebra. The costal facets are located on the vertebrae that the rib articulates with. They are the superior costal facet, the inferior costal facet, and the transverse costal facet.
What ribs have costal facets?
Costal facets only apply to ribs 2–9. Ribs 1, 10, 11, and 12 articulate completely onto the thoracic vertebrae rather than in between two of them.
What are the T vertebrae?
Thoracic vertebrae are the twelve vertebral segments (T1-T12) that make up the thoracic spine. These structures have very little motion because they are firmly attached to the ribs and sternum (breastbone).
Do all thoracic vertebrae have Demifacets?
The capitulum of a rib (see later) sits between and articulates with two successive centra, for which most thoracic vertebrae possess costal demifacets (Figure 7.11). These are anteriorly and posteriorly paired facets, so that a vertebra typically has four demifacets.
Which ribs articulate with costal cartilages?
The true ribs are the ribs that directly articulate with the sternum with their costal cartilages; they are the first seven ribs.
What does the transverse costal facet articulate with?
The transverse costal facet is the surface that articulates with the tubercle of the rib with the same number for the first ten thoracic vertebrae. For example, the transverse costal facet of thoracic vertebra 5 articulates with the tubercle of rib 5.
Where are the demifacets located on a rib?
A facet is a flat or nearly flat surface on a bone. A demifacet is actually half of a facet and is where part of the head of the rib or part of the costal cartilage articulates and these are usually found on ribs 2 through 9.
Where is the demifacet located in the thoracic spine?
(dĕm′ĭ-făs″ĕt) In the thoracic spine, T1 through T9, a notch on the superior and inferior aspects of the posterior vertebral bodies that articulates with the head of the rib. Medical Dictionary, © 2009 Farlex and Partners
Which is a demifacet of the sternum body?
On the lower lateral side of the manubrium is a demifacet, which together with a similar facet on the body, forms a cavity for articulation with the second costal cartilage. The body of the sternum is the flat, narrow and longitudinally oriented middle part of the sternum.