Neck posture is maintained dynamically by the bones of the spine pulled into position by the muscles that attach to them. Although the neck is highly flexible, it is also very unstable.

Anatomy of the spine Doctors divide the spinal column into five segments based on the area of the body and the appearance of the spinal bones. A person’s spine consists of 33 bones called vertebrae.

SMA weakens muscles by killing off motor neurons in the spine. The first motor neurons to go are typically those controlling muscles in the shoulders, back, hips and thighs.

A big part of developing a healthy, strong back is learning to train the small rotator muscles of the spine. With this exercise, you can maintain a strong base of support with your lower body. For ...

In microgravity, these muscles are prone to atrophy, and that causes the bones in the spine to stiffen and straighten out. Such body changes could explain why so many astronauts suffer from back ...

Muscle weakness could be a sign of spinal muscular atrophy, which can strike all ages but is the No. 1 genetic cause of death in infants. Here's what it is and what you can do about it.