T1 is an abbreviation for Thoracic vertabra number 1. The spine has 7 bones in the neck, called cervical vertabae, and numbered C1 to C7. Below them are the twelve thoracic vertebrae, numbered T1 to T12. Each thoaracic vertabra is attached to a set of ribs. In fact, the definition of a thoracic vertabra is that it articulates with a set of ribs. So T1 is the first spine bone connected to the uppermost set of ribs, just below the base of the neck.
There are ten.
The Spine is made up of many smaller bones, which is what allows flexing and movement of the spine. Please see the related links for a detailed picture of the bones that make up the spine.
The lumbar spine controls many parts of your body. The spine has numerous nerve connections to all the organs in your body. If your lumbar spine is damaged it can harm different organs.
The human backbone, or spine, is composed of 33 bones. It is divided into segments: the cervical spine, the thoracic spine, the lumbar spine, the sacrum, and the coccyx.
one spine
Seven
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5
4
one
I think that it is 7