The spine is comprised of several regions including the sacral, lumbar, cervical, and thoracic regions. The first thoracic vertebrae spine (T1) is located in the upper part of the back. The thoracic vertebrae are located between the cervical and lumbar portions of the back. The vertebrae themselves are numbered in descending order. T1 is located at the top of the thoracic spine, and it is located beneath, and articulates with, the seventh cervical vertebra (C7). Also, as the thoracic vertebrae extend down the back, each bone grows relatively bigger. The lower the vertebra, the more weight it has to support, including not only the vertebra and cartilage above it, but the entirety of the skull as well. Comparatively speaking, T1 is the smallest of all thoracic vertebrae. Like others, the first thoracic vertebrae spine (T1) chiefly encases the spine. Several processes allow for muscular tissue attachments. Also, T1 articulates with a first pair of bones in the rib cage. This articulation occurs at T1's two transverse processes.
Written and medically reviewed by the Healthline Editorial Team
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In Depth: T1

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