How is spine numbered?

The spinal nerves are numbered according to the vertebrae above which it exits the spinal canal. The 8 cervical spinal nerves are C1 through C8, the 12 thoracic spinal nerves are T1 through T12, the 5 lumbar spinal nerves are L1 through L5, and the 5 sacral spinal nerves are S1 through S5. There is 1 coccygeal nerve.

What are the numbers of your spine?

From top to bottom, the vertebrae are:

  • Cervical spine: 7 vertebrae (C1–C7)
  • Thoracic spine: 12 vertebrae (T1–T12)
  • Lumbar spine: 5 vertebrae (L1–L5)
  • Sacrum: 5 (fused) vertebrae (S1–S5)
  • Coccyx: 4 (3–5) (fused) vertebrae (Tailbone)

What are the 5 sections of the spinal column?

The spine is composed of 33 bones, called vertebrae, divided into five sections: the cervical, thoracic, and lumbar spine sections, and the sacrum and coccyx bones. The cervical section of the spine is made up of the top seven vertebrae in the spine, C1 to C7, and is connected to the base of the skull.

Where is S2 in the spine?

S2 is located at the level of posterior superior iliac spine. S2 covers the back of the thighs.

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Are there 26 vertebrae in the spine?

The spine is made up of 33 vertebrae. More than 13 million neurons are found in the spine. Adults only have 26 vertebrae because bones fuse together as we age.

What does C stand for in spine?

Intervertebral discs, small cartilage cushions, pad the spaces between the vertebrae. The discs allow movement of the spinal column and function like shock absorbers. A letter and number identify vertebrae. In the cervical column, the vertebrae are C1 through C7. The “C” stands for “cervical.”

What absorbs shock in the spine?

The intervertebral discs are soft structures which act as shock absorbers between each of the vertebrae (bones) in the spine. A single disc sits between each vertebra. Each intervertebral disc has a strong outer ring of fibres (‘annulus’), and a soft, jelly-like centre (nucleus).

What is the bone called at the bottom of your spine?

The bottom of the spine is called the sacrum. It is made up of several vertebral bodies usually fused together as one. The remaining small bones or ossicles below the sacrum are also fused together and called the tailbone or coccyx.

What are symptoms of S2 nerve damage?

S2 affects the back of the thighs. S3 affects the medial buttock area.

Patients with injuries to the sacral nerve roots may experience:

  • Lack of control of bowels or bladder.
  • Lower back pain.
  • Leg pain, which may radiate down the back of the leg(s)
  • Sensory issues in the groin and buttocks area.

Where is S1 and S2 on the spine?

S1 refers to the first sacral bone, S2 to the second sacral bone, and so on. S1 is at the top and S5 is towards the bottom. Each number corresponds with the nerves in that part of the spinal cord. S1 nerves affect the hips and groin.

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What part of the spine controls the heart?

Thoracic (mid back) – the main function of the thoracic spine is to hold the rib cage and protect the heart and lungs. The twelve thoracic vertebrae are numbered T1 to T12.

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