fissu'ra, pi. fissures

[L. from findere to cleave.] Fi ure, cleft, sulcus. a fi ure in the auricular cartilage between the caudahelicis and the antitragus. running in an arched form backward from the isthmus of the fornicate gyrus to the occipital pole, bounding the upper border of the lingual gyrus. fi ure of Sylvius, the largest of the cerebral fi ures, arising from the subs tanti a per for at a anterior and pa ing upward and backward, separating the temporal from the frontal and parietal lobes; it usually divides into three branches on the convex surface of the hemisphere. fi ure bounding the under surface of the temporal lobe on its medial aspect, separating the fusiform gyrus from the hippocampal and lingual gyri. fi ure, a fi ure bounding the medial surface of the gyrus hippocampi, extending from the sulcus corp or is callosi forward, between the fascia dentata and the hippocampal convolution, its anterior extremity being capped by the uncus. of the cerebrum, great longitudinal fi ure, a deep cleft separating the two hemispheres of the cerebrum. a deep fi ure in the median line of the anterior surface of the spinal cord and of the medulla oblong at a. ian fi ure of the medulla oblong at a occupying the lower half of the medulla and terminating at the tower point of the fo a rhomboidal is; (2) sulcus median us posterior [BNA], sphenomaxillary fi ure; a cleft between the greater wing of the sphenoid and the orbital plate of the m.axilla, through which pa the superior maxillary division of the fifth nerve, the orbital branch of the same, fibers from. Meckel's ganglion, and the infraorbital ve els.