1. The temporal bone is located on both sides of the head and is mainly divided into scales, drums and petrous parts. Scale is located on the body surface and has three ridges, which is the main part of the temporal bone; The tympanum is a part of the temporal bone, which looks like a bulge and mainly accommodates the external auditory canal; Petrosal part is a part of temporal bone with irregular shape, which contains three small bones of middle ear. These parts meet in the temporal region to form a complete temporal bone.
2. The parietal bone is located on the top of the head and is divided into two main parts, the scale part and the drum part. Scale is the main part of parietal bone, with smooth surface and scaly shape; The drum is a part of the parietal bone, which looks like a bulge and mainly accommodates the external auditory canal. The two parietal bones meet at the back to form a complete parietal bone.
3. Paired skulls are very important for the protection and function of human head. They can protect the brain from external injury, maintain the stability of intracranial pressure, and participate in the construction of hearing and balance system. If the skull is fractured or deformed in pairs, it may cause hearing loss, imbalance, headache and other symptoms.
Related contents of brain and skull.
1, growth and development of cranium: During fetal development, cranium follows certain growth rules. In the early embryo, the skull originated from five progenitor cells, namely, two frontal bones, two parietal bones and one occipital bone. With the development of embryos, these progenitor cells began to grow and differentiate, eventually forming a pair of temporal bones and parietal bones, as well as a pair of unpaired frontal bones, occipital bones and ethmoid bones.
2. The adaptability and changes of the brain and skull: In the process of human evolution, the brain and skull also experienced adaptive changes. By comparing the skull shapes of different primates, we can find that the paired temporal bone and parietal bone have unique shapes and structures in humans. This adaptive change may be related to the highly developed and complex cognitive function of the human brain.
3. Cranium is an integral part: an important part of human skull, which is vital to the protection and function of the head. Understanding their structure, growth process and changes in human evolution will help us better understand the physiological and pathological characteristics of human heads.