Dr. Jeffrey I. Kennis,  D.C.
205 Commercial St.
Boston, MA 02109

( 617)720-2329




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Understanding the anatomy and inner workings of your spine will help you stay mindful of how to best protect your spine as you go through your day. This top-to-bottom guide to the spinal anatomy can help you understand the potential problems.

See Spinal Anatomy and Back Pain

Thoracic vertebrae

The spine is comprised of three sections: cervical, thoracic, and lumbar.
 Spine Anatomy Interactive Video

Your neck is susceptible to strain or injury

The spine begins at the base of the skull in a section called the cervical spine. This consists of 7 vertebrae and extends through your neck to your upper back.

See Cervical Vertebrae

Acute neck pain is most often caused by a muscle, ligament or tendon strain (such as from a sudden force or straining the neck). These injuries will usually heal with time and nonsurgical treatments to alleviate the pain (such as ice/heat, medications, chiropractic or osteopathic manipulation, etc).

See Treatment for Neck Pain

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If your neck pain lasts longer than two weeks to three months—or if you experience mainly radiating symptoms like arm pain, numbness or tingling—there is often a spinal problem. The most common examples are:

Your middle back is not usually a source of pain

The 12 vertebral bodies in your upper and middle back make up the thoracic spine. The firm attachment of the rib cage at each level of the thoracic spine provides stability and structural support and allows very little motion, which means that thoracic spine injuries are rare.

See Thoracic Spine Anatomy and Upper Back Pain

However, irritation of the large back and shoulder muscles or joint dysfunction in this area can be very painful.

See All About Upper Back Pain

Thoracic vertebrae

A disc herniation in the lumbar spine can put pressure on the nerve root, causing radiating pain down the back of the leg (sciatica). Watch Lumbar Herniated Disc Video

Your lower back is the most prone to injury

Your lower back (lumbar spine) has the least structural support and endures the most strain, making it the most frequently injured area of the spine.

Watch Lumbar Spine Anatomy Video

The motion in the lower spine is divided between five motion segments, although a disproportionate amount of the motion is in the lower segments (L4-L5 and L5-S1). Consequently, these two segments are the most likely to be injured. For example, a herniated disc in this area can cause pain and possibly numbness that radiates through the leg and down to the foot (sciatica).

See Sciatica Causes

Most short episodes of lower back pain are caused by muscle strain. Even though this doesn't sound like a serious injury, pain in the low back can be severe.

See Pulled Back Muscle and Lower Back Strain

But, as with the cervical spine, if pain lasts a few months or is accompanied by radiating pain or tingling in the legs and feet, a structural problem with the vertebrae or discs is the likely culprit.

See Cervical Discs

The base of your spine can cause pain too

Below the lumbar spine is a bone called the sacrum, which makes up the back part of the pelvis. This bone is shaped like a triangle that fits between the two halves of the pelvis, connecting the spine to the lower half of the body.

See Sacrum (Sacral Region)

The sacrum is connected to part of the pelvis (the iliac bones) by the sacroiliac (SI) joints. Pain here is often called sacroiliac joint dysfunction, and is more common in women than men.

See Treatment Options for Sacroiliac Joint Dysfunction

The coccyx, or the tailbone, is at the very bottom of the spine. Pain here is called coccydynia and is more common in women than men.

See Coccydynia Symptoms

Take advantage of the many educational videos and articles we have provided on our site to become an expert on your spinal anatomy. Understanding how your spine works, and how things can go wrong, can help you take steps to protect and strengthen it.

Learn more:

Spinal Cord and Spinal Nerve Roots

Causes of Pain in the Lumbar Spine