| synchondrosis manubriosternalis | The early union, by hyaline cartilage, of the manubrium and the body of the sternum, which later becomes a symphysial type of joint. Synonym: synchondrosis manubriosternalis. (05 Mar 2000) |
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| synchondrosis petro-occipitalis | Fibrocartilage filling the petro-occipital fissure. Synonym: synchondrosis petro-occipitalis. (05 Mar 2000) |
| synchondrosis sphenoethmoidalis | Cartilaginous union between the body of the sphenoid and the posterior part of the ethmoidal labyrinth. Synonym: synchondrosis sphenoethmoidalis. (05 Mar 2000) |
| synchondrosis spheno-occipitalis | Cartilaginous union between the body of the sphenoid and the basilar portion of the occipital; it fuses by the twentieth year; incorrectly called spheno-occipital suture. Synonym: synchondrosis spheno-occipitalis, spheno-occipital joint, spheno-occipital suture. (05 Mar 2000) |
| synchondrosis sphenopetrosa | Sphenopetrous synchondrosis, fibrocartilage filling the sphenopetrosal fissure. Synonym: synchondrosis sphenopetrosa. (05 Mar 2000) |
| synchondrosis xiphosternalis | The cartilaginous union between the xiphoid process and the body of the sternum. Synonym: synchondrosis xiphosternalis. (05 Mar 2000) |