How are spinal discs numbered?
The bone numbering starts at the top, near the skull, with C1 and then each bone going down is given a higher number with the last bone in the neck called C7. Between those bones are discs, each given two numbers that coorespond to the bone above and below the disc. The disc located between C4 and C5 is called C4-C5.
What are the lumbar discs numbers?
The range of motion in the thoracic spine is limited. Lumbar (low back) – the main function of the lumbar spine is to bear the weight of the body. The five lumbar vertebrae are numbered L1 to L5. These vertebrae are much larger in size to absorb the stress of lifting and carrying heavy objects.
How are vertebrae numbered?
Regions of the Vertebral Column The vertebral column is subdivided into five regions, with the vertebrae in each area named for that region and numbered in descending order. In the neck, there are seven cervical vertebrae, each designated with the letter “C” followed by its number.
Where is T6 and T7 in the spine?
T6: Sixth thoracic vertebra. T7: Seventh thoracic vertebra. T8: Eighth thoracic vertebra.
What is L4 and L5?
The L4 and L5 are the two lowest vertebrae of the lumbar spine. Together with the intervertebral disc, joints, nerves, and soft tissues, the L4-L5 spinal motion segment provides a variety of functions, including supporting the upper body and allowing trunk motion in multiple directions.
Does everyone have the same number of vertebrae?
Most people have the same number of vertebrae. The typical number is seven cervical, 12 thoracic and 5 lumbar vertebrae. There are also sacral vertebra analogues which are all typically fused to form the sacrum.
What does S stand for in your back?
For example, the cervical region is identified by the letter “C,” while the thoracic region is identified by the letter “T.” The lumbar region is identified by the letter “L,” and the sacral region is identified by the letter “S.” The number that follows each letter indicates exactly which vertebra in the region was …
What does T5 and T6 control?
T3, T4, and T5 feed into the chest wall and aid in breathing. T6, T7, and T8 can feed into the chest and/or down into the abdomen. T9, T10, T11, and T12 can feed into the abdomen and/or lower in the back.
How many discs are in the spine?
There are 23 discs in the human spine: 6 in the neck (cervical) region, 12 in the middle back (thoracic) region, and 5 in the lower back (lumbar) region Discs are named by the vertebral body above and below. For example, the disc between the fifth and sixth cervical vertebrae is designated “C5-6”.
Where is L1 on spine?
The L1 vertebra is located in the spinal column of the lumbar (lower back) region inferior to the T12 vertebra and superior to the L2 vertebra.
What are the numbers in the spine?
The number indicates the level of the lumbar spine in which the particular vertebra is located. Each region of the spine (i.e., the cervical, thoracic, lumbar and sacral regions) have their own numbers; the bones of the lumbar spine are numbered from L-1 to L-5.
What are the four regions of the spine?
The spine (also called backbone or vertebral column) starts at the top of your neck, just under the scull, and goes all the way down to your tail-bone. There are 5 regions of the spine: cervical, thoracic, lumbar, sacral, and coccygeal. However the 3 most commonly discussed regions are the cervical, thoracic, lumbar regions.