The lambdoid suture joins the two parietal bones to the occipital bone in the back of the skull. The intersection of the sagittal suture, joining the two parietal bones together, and the
lambdoid suture forms a tripartite shape, resembling the Greek letter 'lambda,' and giving the suture its shape. The lower ends of the lambdoid suture extend to the mastoid processes of the temporal bones, joining them to the occipital bone. Research Lambdoid Suture
The rearmost part of the temporal bone is referred to as the mastoid process. Sometimes also called the mastoid bone (because it is demarcated from the rest of the temporal bone by a suture line), this process joins the occipital bone at the lower ends of the lambdoid suture. Research Mastoid Process
 
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Matt and Leela Probert