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Why is our upper skull made up of multiple bones, except a single bone?
The skull is a bony structure that forms the head in vertebrates, which is made up of a number of fused flat bones, that are joined together by sutures (fibrous joints). Sutures are a type of fibrous joints that are immovable and are only found between the flat, plate-like bones of the skull. They have limited movement until about 20 years of age, after which they become fixed and immobile.
Skulls being made up of multiple bones is most important because, when a baby is born, it has to squeeze itself through the mother's birth canal, at this stage, these multiple bones provide enough flexibility to the skull so that the baby can pass easily, without any distortion, and it also serves to reduce injury when a baby falls down. That’s why our whole skull, not only the upper part is made up of multiple bones, except a single bone.
The human skull is composed of 22 bones, which is divided into two parts:
1. The Neurocranium- It encloses the brain and provides a protective layer to it. It is comprised of eight bones: (i) Occipital (ii) Two Temporal bones (iii) Two Parietal bones (iv) Sphenoid (v) Ethmoid (vi) Frontal bone. 2. Viscerocranium (facial skeleton)- It is the skeleton of the face which supports the face structures. It is comprised of fourteen bones: (i) Two Nasal (ii) Two Maxillae (iii) Two Lacrimals (iv) Two Zygomatics (v) Two Palatines (vi) Two Inferior Nasal Conchae (vii) Vomer (viii) Mandible (lower jaw, or jawbone).
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