The bones of the skull, while having joints, do not move freely. This is in contrast to many other bones in the body, which allow for a wide range of motion.
The Immobile Nature of Skull Bones
The bones of the skull are fused together, forming a rigid structure that protects the brain. While there are some slight movements possible at the sutures (the joints between the skull bones), these are generally imperceptible and do not contribute to significant movement. This immobility is crucial for the brain's protection. Consider the implications of a freely moving skull—it would offer minimal protection against impact.
The referenced text regarding a broken collarbone highlights that while broken bones can cause significant mobility issues ("...Newborns often will not move their arm for days after breaking the..."), this relates to injury-induced immobility, not inherent immobility of the bone itself. Other references discussing bone fractures emphasize immobilizing the broken bone to aid healing ("Keep the injured area from moving."). This contrasts with the innate fixed nature of the skull bones.
The reference discussing otosclerosis explains how the immobility of a specific bone in the ear can impair hearing ("When this bone is unable to vibrate, sound is unable to travel through the ear and hearing becomes impaired."). Again, this is about the function of a specific bone, rather than the general immobility of bones in the body.
