thoracic vertebra


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thoracic vertebra

one of the 12 bony segments of the spinal column of the upper back designated T1 to T12 or D1 to D12. T1 is just below the seventh cervical vertebra (C7), and T12 is just above the first lumbar vertebra (L1). The thoracic part of the spine is flexible and has a concave ventral curvature. Each vertebra has a broad thick lamina; long, obliquely directed spinous processes; and thick strong articular facets. The thoracic vertebrae are unique in having small lateral facets for articulation with the ribs. The vertebrae are separated from each other by intervertebral disks. The vertebrae become thicker and heavier in descending order from T1 to T12. Compare cervical vertebra, lumbar vertebra, sacral vertebra.

thoracic vertebra

One of the 12 vertebrae that connect the ribs and form part of the posterior wall of the thorax.
See: spinal column for illus
See also: vertebra
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Hot carcass yield (HCY), cold carcass yield (CCY), cooling loss (CL), loin eye area (LEA), backfat thickness between the 7th and 8th thoracic vertebra (BTx 7 and 8), backfat thickness between the 3rd and 4th lumbar vertebra (BTx 3 and 4), backfat thickness at point P2 (BT P2), lean meat yield (LMY), length and depth of carcass from male immunocastrated, surgical castrated and female pigs Variable Treatment CV (%) Castrated Female Immunocastrated HCY (%) 79.
The penultimate thoracic vertebra is the only mobile vertebrae of the trunk in most birds and seems to be the weak point of the vertebral column because most trauma and infections occur at this location.
Post-operative radiographs of 101 consecutive patients (151 levels ranging from the third thoracic vertebra through the fifth lumbar vertebra), were evaluated for cement leakage using a stringent diagnostic technique.
Around the fifth thoracic vertebra, the thoracic duct crosses to the left side of the vertebral column, where it continues ascending behind the aortic arch, into the neck above the clavicle and terminates into the venous circulation, where the left subclavian and jugular veins combine to form the brachiocephalic vein.