Fun Facts About the Spine You Might Not Know

Your Spine Is Your Lifeline.

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Fun Fact #1: You’re slightly taller in the morning
This happens for the same reason astronauts can gain an inch or two in height while in space: reduced gravitational compression. Throughout the day, gravity causes your body weight to press down on the intervertebral disks that cushion the bones in your neck and back. As these disks compress, your spine shortens a bit. After about age 40, the combined effects of gravity and aging can reduce your height by roughly a quarter inch or more each decade. Also, spinal discs absorb fluid while you sleep, making you slightly taller in the morning. Throughout the day, standing and sitting cause the discs to lose fluid, compressing the spine and reducing height slightly. The difference between morning and evening height is small, but the daily impact of gravity on your spine is very real.

Fun Fact #2: Babies have more vertebrae than adults.
That’s right—humans begin life with 33 separate vertebrae, but most adults end up with 24-26. As we grow, several of these bones naturally fuse together to form the sacrum (at the back of the pelvis) and the coccyx (tailbone). The sacrum consists of five fused vertebrae, while the coccyx is made up of three or more fused bones. This fusion, which begins during puberty, increases stability and helps support body weight.

Fun Fact #3: The top spinal bone is named after a Greek god.

The top vertebra in the neck is called the atlas. In Greek mythology, Atlas held the world on his shoulders. Similarly, this vertebra supports the skull and brain.

Fun Fact #4: Male spines are generally longer than female spines

On average, the male spinal column measures about 71 cm, while the female spinal column averages 61 cm. Female spines tend to have more curvature, and the point where the spine meets the brain is positioned slightly higher.

Fun Fact #5: Humans have the same number of neck vertebrae as giraffes.
This might seem surprising until you learn that nearly all mammals have seven cervical (neck) vertebrae, with sloths and manatees as the rare exceptions. Still, when you consider that a giraffe’s neck can stretch over six feet while the average human neck is under five inches long, it’s a fun detail to think about—especially during a trip to the zoo or on safari.

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More Info About the Spine

THE SPINE IS MADE UP OF MANY INTERCONNECTED PARTS

Let’s start with the basics. The spine is a complex structure made of many working components. Medical professionals divide the spine into five main regions:

Cervical spine: Located in the neck and upper back, this section contains seven vertebrae.
Thoracic spine: Found in the middle of the back, the thoracic spine has 12 vertebrae.
Lumbar spine: This region forms the lower back and includes five vertebrae.
Sacral spine: Positioned below the lumbar spine and above the tailbone, the sacral spine also contains five vertebrae.
Coccygeal spine: Commonly called the tailbone, this final section is made up of four vertebrae.

Altogether, the human spine contains 33 vertebrae. These small bones form the structure of the spinal column. In addition to bones, the spine includes nerves, ligaments, discs, muscles, tendons, cartilage, and other tissues that all work together.

Key spinal structures include:

Vertebrae: These are stacked along the spine like building blocks. Each vertebra has a bony projection called a spinous process—the bumps you feel when you run your hand down your back. The center of each vertebra has an opening, and together these openings form a tunnel through the spine.
Neural foramen (spinal canal): This tunnel runs through the center of the spine and allows the spinal cord to pass safely through.
Facet joints: These small joints connect the vertebrae and allow the spine to bend and twist. They are covered in smooth cartilage and surrounded by a joint capsule filled with synovial fluid, which reduces friction and allows smooth movement.
Intervertebral discs: These soft, cushion-like discs sit between each vertebra. They absorb shock and protect the spine during movement. Each disc has a tough outer layer and a soft, gel-like center.

THE SPINAL CORD AND SPINAL COLUMN ARE DIFFERENT

The spinal cord is a bundle of nerves that runs through the spinal canal. It ends about two-thirds down the spine. Below that point is another group of nerves called the cauda equina, named for its resemblance to a horse’s tail. These nerves control movement and sensation in the legs and bladder.

The spinal cord is protected by three membranes—the dura mater, arachnoid mater, and pia mater—which help shield it from damage.

The spinal column, on the other hand, refers to the entire stack of vertebrae from the neck down to the tailbone. It includes bones, muscles, ligaments, tendons, discs, cartilage, and spinal fluid.

THE SPINAL CORD IS PART OF THE CENTRAL NERVOUS SYSTEM

The spinal cord works closely with the brain as part of the central nervous system. It acts like a communication highway, carrying messages between the brain and the rest of the body. For example, when you walk, signals travel from your brain through the spinal cord to your leg muscles.

This pathway connects the brain to the peripheral nerves throughout the body. The spinal cord contains more than 69 million neurons, while the brain contains about 86 billion.

A HEALTHY SPINE IS FLEXIBLE

The spine is designed to move, though some regions are more flexible than others. The cervical spine is the most flexible section. Discs, ligaments, and facet joints all contribute to this mobility by reducing friction and allowing smooth motion.

Without these structures, bending or twisting would be painful and limited. Stretching and maintaining good posture help keep the spine flexible and healthy. Poor posture and stiffness can increase the risk of disc problems and other spinal conditions.

SMOKING HARMS SPINAL HEALTH

Research shows that smoking negatively affects the spine. Smokers are at higher risk for serious spinal conditions, including lumbar spinal stenosis. Smoking can also interfere with healing after spinal surgery, which is why many surgeons require patients to stop smoking before and after procedures.

HUMANS CANNOT SURVIVE WITHOUT A SPINE

The spine connects the brain to the rest of the body, allowing nerve signals to travel. These signals control movement, sensation, and essential body functions. Without this connection, the body would not be able to function properly, making the spine vital for survival.

THE SPINAL CORD CAN “REMEMBER” PAIN

The spinal cord plays a role in learning and memory related to pain. After an injury, it can continue sending pain signals to protect the affected area while healing occurs. In this sense, the spinal cord retains a memory of pain.

Additionally, cerebrospinal fluid—which surrounds the brain and spine—has been shown in studies to support brain health and memory.

SITTING IS VERY BAD FOR YOUR SPINE.

Sitting puts 40% more pressure on your spine than standing. If you're slouching, it’s even worse. Poor sitting posture can put up to 200+ pounds of pressure on your lower back.

CAR ACCIDENTS ARE A LEADING CAUSE OF SPINAL CORD INJURIES

Motor vehicle accidents are the most common cause of spinal cord injuries, accounting for nearly half of all cases. In the United States, around 12,000 spinal cord injuries occur each year, with about 6,000 resulting from traffic accidents.

Other major causes include:

Falls (16%)
Assault (12%)
Sports and work-related injuries (10%)

MOST PEOPLE EXPERIENCE LOW BACK PAIN

If you deal with lower back pain, you’re far from alone. The lumbar region is the most common area of the spine for pain and injury because it supports the weight of the upper body and handles a lot of bending and twisting. In many cases, lower back pain comes from a mild muscle strain that resolves within a few weeks, though more serious strains may take months to heal. Chronic pain is often linked to conditions like herniated disks or degenerative disk disease, which tend to worsen over time. About 80% of people will experience low back pain at some point. Pain may be acute (short-term) or chronic (lasting 12 weeks or longer). Roughly 20% of acute cases develop into chronic pain.

Common causes include: