it is essential to recognize certain laryngeal and hypopharyngeal landmarks in order to choose the most appropriate surgical approach for excision of a tumor in any given site : that the larynx has two embryological origins , branchial and non-branchial , separated by the glottis , that the cartilaginous skeleton and the ossification of the thyroid cartilage provide a means for the spread of endolaryngeal cancer , that the pre-epiglottic region is divided in two by a medial wall and is closely connected to the endolarynx through the hollow vascular channels of the fibro-cartilage of the epiglottis , that the connective intralaryngeal tissue - conus elasticus , anterior commissure ligament , conoid ligament , and the articular capsule of the crico-arytenoid joint - must be taken into consideration to explain the spread of the tumor , that there exists the concept of arytenoid unity , that element of the branchial larynx which must be conserved in any functional oncologic surgery to the larynx and pharynx .
C0037253
skeleton
C0007301
cartilage