Understanding Your Spine & Nerves

Your spine supports the body, protects the spinal cord, and allows movement. Understanding a few basic terms can make an examination, imaging report, or treatment discussion easier to follow.

Spine Anatomy Basics

The spine is divided into five regions. In adults, 24 vertebrae remain individually movable; the vertebrae of the sacrum and coccyx are normally fused.

Cervical Spine (Neck)

Seven vertebrae (C1-C7) support the head and allow neck movement.

Thoracic Spine (Mid-Back)

Twelve vertebrae (T1-T12) connect with the ribs and contribute to the chest wall.

Lumbar Spine (Lower Back)

Five vertebrae (L1-L5) carry substantial load and allow lower-back movement.

Sacrum

Five fused vertebrae connect the spine to the pelvis.

Coccyx (Tailbone)

A small group of fused vertebrae at the base of the spine; the number varies among people.

Between each vertebra sits an intervertebral disc—a cushion made of tough outer fibers (annulus fibrosus) surrounding a gel-like center (nucleus pulposus). These discs act as shock absorbers and allow your spine to bend and twist.

How Nerves Work and Why They Cause Pain

Your spinal cord runs through the center of your vertebrae in a space called the spinal canal. At each level, nerve roots branch off from the spinal cord and exit through openings called foramina. These nerves carry signals between your brain and the rest of your body.

When something compresses or irritates these nerves—such as a herniated disc, bone spur, or narrowed spinal canal—you may experience:

• Pain that radiates along the nerve pathway (such as sciatica down the leg)
• Numbness or tingling in specific areas served by that nerve
• Weakness in muscles controlled by the affected nerve
• Loss of reflexes or coordination

When to Seek Specialist Care

Back and neck symptoms have many possible causes, and the appropriate timing of evaluation depends on the symptom pattern, neurologic findings, medical history, and effect on daily function.

Red Flags: Seek Emergency Medical Attention

• New loss of bladder or bowel control, especially with numbness in the groin or inner thighs (saddle anesthesia)
• Sudden or rapidly worsening weakness in an arm or leg
• New severe difficulty walking after an injury, or symptoms suggesting a major spine injury

Fever or chills with severe spine pain, a history of cancer with new persistent pain, unexplained weight loss, or a weakened immune system also merit prompt medical assessment. The safest setting depends on symptom severity and the person’s overall condition.

Schedule a Consultation If You Experience:

• Arm or leg pain that may follow a nerve pattern
• Numbness, tingling, or weakness that persists or worsens
• New difficulty with walking, balance, or hand coordination
• Pain that continues despite reasonable self-care or limits sleep, work, walking, or other daily activities
• Uncertainty about a diagnosis, imaging finding, or proposed procedure

Conservative Treatment Options

Before considering surgery, most spine conditions are initially treated with conservative approaches:

• Medication review: A clinician can discuss nonprescription or prescription options in the context of kidney, stomach, heart, bleeding, pregnancy, and medication-interaction risks.
• Physical therapy or a home program: Exercise may address strength, mobility, movement tolerance, and body mechanics.
• Targeted injections: In selected situations, an injection may help with diagnosis or short-term symptom control.
• Activity and lifestyle changes: Pacing, ergonomics, sleep, nicotine cessation, and general conditioning may be relevant depending on the diagnosis.
• Other symptom-management options: Their usefulness and safety depend on the underlying problem; treatments that manipulate the spine are not appropriate for every condition.

Surgery may be discussed when symptoms and objective findings identify a problem that an operation can reasonably address. The decision also considers neurologic function, stability, deformity, prior treatment, medical risk, and the patient’s goals. Progressive neurologic loss or another time-sensitive condition may change the usual nonoperative pathway.

Disclaimer: This chapter is for educational purposes only and does not constitute personal medical advice. Every patient’s situation is unique. Please consult with Dr. Greenberg or your healthcare provider for personalized recommendations based on your specific condition and medical history.