The human skull is made of 29 bones, connected most often by ligaments and a movable temporomandibular joint (articulatio temporomandibularis). The bones of the skull, which make up the brain (neurocranium) and facial part (splanchnocranium), are divided into even and odd ones. The occipital bone is odd, making up the part of the brain. In the diagnosis of sex, attention is paid to the expression of the external occipital tuberosity. Attention is also drawn to the ossification of the spheno-occipital synchondrosis (synchondrosis sphenooccipitalis), which connects the occipital bone to the shaft of the sphenoid bone (os sphenoideum). This fusion occurs between the ages of 18 and 25. In children, there is a posterior fontanelle (fonticulum posterior) between the parietal bones and occipital bone. It is located at the junction of the sagittal and cephalic sutures and grows between 6 and 8 weeks of age.