part of part of develops from develops from composed primarily of basioccipital bone http://upload.wikimedia.org/wikipedia/commons/c/c4/Parsbasilaris%28young%29.PNG Chondral bone that articulates with the exoccipitals dorsally, the prootics anteriorly, the parasphenoid ventrally, and the first free vertebra posteriorly. The basioccipital forms the floor of the foramen magnum. The basioccipital is an unpaired medial bone.[TAO] TODO - check FMA basioccipital bone basi-occipital ZFA:0000472 basilar part of occipital bone FMA:52858 basioccipital VHOG:0001152 EMAPA:18705 An unpaired medial bone contributing to the ventral margin of the foramen magnum that extends into the floor of the brain cavity. It can contribute to the centromedial portion of the occipital condyle.[AAO] relationship loss: overlaps basioccipital-exoccipital joint (TAO:0002038)[TAO] In some teleosts the anterior vertebral centra fuse to the basioccipital forming a monopartite occipital condyle.[TAO] UBERON:0001692 One of the bones of the occiput, the part of the skull which articulates with the spine. The basioccipital is located (if present) ventral to the foramen magnum. It often rests on or articulates with the basisphenoid, as well as meeting the exoccipitals. The basioccipital usually forms most (sometimes all) of the occipital condyle(s) and the ventral margin of the foramen magnum. relationship type change: overlaps neurocranium (TAO:0001580) CHANGED TO: part_of neurocranium (UBERON:0001703)[TAO] MA:0001462 MFMO:0000045 AAO:0000039 relationship loss: overlaps parasphenoid-basioccipital joint (TAO:0001832)[TAO] TAO:0000472 SCTID:138976007 pars basilaris ossis occipitalis Wikipedia:Basilar_part_of_occipital_bone chondrocranium bone tissue endochondral bone basicranium occipital region basioccipital cartilage element neurocranium bone basioccipital endochondral element