(anatomy) A vertical gap between the lateral pterygoid plate of the pterygoid process of the sphenoid bone and the maxilla that descends at right angles to the medial end of the inferior orbital fissure and gives passage to part of the maxillary artery and vein.

plural of ape-fissure

(anatomy) Synonym of Affenspalte

(medicine, surgery) A spiral needle designed for catching together the gaping lips of a wound.

plural of fissure needle

plural of fissure vein

(geology) A crack in the surface of the Earth which contains mineral matter.

plural of fissure vent

(volcanology, geology) A volcanic vent from which lava flows, with minimal explosive activity; characteristic of shield volcanoes.

(anatomy) A groove along the anterior midline of the spinal cord that incompletely divides it into symmetrical halves.