Lateral sulcus Lateral sulcus The lateral sulcus (also called Sylvian fissure or lateral fissure) is one of the most prominent features of the human brain. The lateral sulcus is a deep fissure in each hemisphere that separates the frontal and parietal lobes from the temporal lobe. The insular cortex lies deep within the lateral sulcus. The lateral sulcus divides both the frontal lobe and parietal lobe above from the temporal lobe below. It is in both hemispheres of the brain. The lateral sulcus is one of the earliest-developing sulci of the human brain. It first appears around the fourteenth gestational week. The
Red Hills Fissure Pleistocene. The abundant fossil remains of the Jamaican Coney ("Geocapromys brownii") found there have enabled the construction of a life table for that species. Analysis of fluorine uptake in the fossil bone has allowed the time-span of the deposit to be dated to about 25–40 thousand years ago. Fossil remains of the extinct Jamaican flightless ibis ("Xenicibis xympithecus") have also been found there. Red Hills Fissure Red Hills Fissure is a palaeontological site at the Red Hills in Saint Andrew Parish of south-eastern Jamaica. The Red Hills Fissure is a karstic solutional feature, with a vertical extent of about 8