Why does the human skull have an uneven bumpy surface on the back side

The uneven bumpy surface on the back of the human skull, known as the occiput, serves multiple important functions:

Attachment site for muscles: The bony ridges and bumps on the occiput provide attachment points for various muscles that control neck movement, such as the trapezius, splenius capitis, and semispinalis capitis.
Protection of the brainstem: The bumpy surface of the occiput contributes to the overall protection of the delicate brainstem, which is located at the base of the skull. The bony projections create a sort of bony armor, safeguarding the brainstem from external impacts or trauma.
Alignment and stability: The uneven surface of the occiput facilitates the proper alignment of the head and neck bones, ensuring stability and a wide range of motion.
Growth and development: The bumpy surface undergoes a remodeling process during growth and development, allowing for the expansion of the brain and the formation of the characteristic contours of the human skull.
Individual variation: The uneven surface of the occiput exhibits considerable individual variation in terms of size, shape, and prominence, contributing to the uniqueness of each individual's appearance.

Related Questions:

What are the main functions of the bumpy surface on the back of the human skull?
How does the uneven surface contribute to the protection of the brainstem?
What role does the bumpy surface play in muscular attachment?
What are the implications of the uneven surface for head alignment and stability?
How does the bumpy surface vary among individuals?

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Why does the human skull have an uneven bumpy surface on the back side?