How many rib bearing thoracic vertebrae?
All surgical cases were performed by experienced pediatric spinal surgeons and all operative reports were dictated by the attending surgeon. We defined normal counts as 12 thoracic (rib-bearing) and five lumbar (non-rib-bearing) vertebrae.
What are the 12 thoracic vertebrae?
Vertebral Column
| Term | # of Vertebrae | Abbreviation |
|---|---|---|
| Thoracic | 12 | T1 – T12 |
| Lumbar | 5 or 6 | L1 – L5 |
| Sacrum | 5 (fused) | S1 – S5 |
| Coccyx | 3 | None |
What do the 12 thoracic vertebrae articulate with?
Thoracic Vertebrae Each thoracic vertebra articulates with a pair of ribs. Each rib end articulates with demifacets above and below the discs to form synovial costovertebral joints as well as the thoracic transverse processes to form costotransverse joints.
Where is 12 vertebrae located?
In many ways, the T12 is a hybrid vertebra with the anatomical features of both a thoracic and lumbar vertebra. The T12 vertebra is located in the spinal column of the thoracic (or trunk) region inferior to the T11 vertebra and superior to the first lumbar (L1) vertebra.
Can you have 13 thoracic vertebrae?
The most common variabilities reported in thoracolumbar anatomy are the presence of 13 rib-bearing thoracic vertebrae with four lumbar-type vertebrae and the presence of 12 rib-bearing thoracic vertebrae with six lumbar-type vertebrae (3).
How are the thoracic vertebrae 11 and 12 difference?
The eleventh thoracic vertebra (T-11) has an intact, superiorly placed costal facet on each side of the vertebral body, but no costal articulation on the transverse processes. The twelfth thoracic vertebra (T-12) resembles T-11, but the inferior articular facets assume the lumbar pattern.
What are the components of the 12 ribs?
It consists of the 12 pairs of ribs with their costal cartilages and the sternum (Figure 6.38). The ribs are anchored posteriorly to the 12 thoracic vertebrae (T1–T12). The thoracic cage protects the heart and lungs.
How are thoracic vertebrae 11 and 12 different?
How are thoracic vertebrae 11 and 12 different from the other vertebrae? The transverse processes do not have facets that articulate with the tubercles of the ribs. The sphenoid bone is sometimes referred to as a “key stone” of the skull. Bones of the skull are separated by immobile joints called sutures.
What nerves does T12 control?
At T12, the ventral ramus becomes a subcostal nerve that travels beneath the twelfth rib. At T1 through T12, the dorsal ramus goes into the back muscles and also provides sensation to the skin. The motor and sensory functions provided by a thoracic nerve root are determined by its vertebral level.
Can you have 11 thoracic vertebrae?
In addition, approximately 5–8% of “normal” individuals lack a pair of ribs/thoracic vertebrae [16], while additional ribs are sometimes considered as normal variants. However, we found no study of normal individuals having 11 thoracic vertebrae combined with 6 lumbar vertebrae.
Where is thoracic 11 and 12?
The thoracic spinal vertebrae consist of 12 total vertebrae and are located between the cervical vertebrae (which begin at the base of the skull) and the lumbar spinal vertebrae. The eleventh thoracic vertebra (T11) is located near the bottom of the thoracic spine.