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Glossary
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Asteriscus (As). Otolith
related with lagena otolithic end-organ. Antirostrum (Ar). Anterior and dorsal projection of the otolith sagitta, above to excisura major or ostial notch. Cauda (Cd). Posterior portion of the sulcus acusticus. Colliculum (Clm). Inner impression of the sulcus acusticus. Collum (Co). Junction of ostial and caudal portion of sulcus acusticus. Crista inferior (Ci). Ventral border of the sulcus acusticus. Crista superior (Cs). Dorsal border of the sulcus acusticus. Inner ear. Main sensorial structure related with auditory and vestibular sense in vertebrates. In Osteichthyan fishes was composed by a pars superior (formed by the three semicircular channels and the utriculus) and a pars inferior (the sacculus and lagena). Excisura major (Ej). Notch placed in the rostral (anterior) rim of the sagitta, between rostrum and antirostrum (if is present). Excisura minor (En). Notch placed in the caudal (posterior) rim of the sagitta, between postrostrum and pararostrum (if is present). Lapillus (Lp). Otolith related with utriculus otolithic end-organ. Lagena (Lg). Otolithic end-organ placed in the anterior zone in the pars inferior of the inner ear. In Ostariphysan fishes is the most developed end-organ. Lobes (L). The minor rounded protrusions along the dorsal and ventral edge of the sagitta. Ostium (Os). Anterior portion of the sulcus acusticus. Otolith. Structure of carbonate calcium (main aragonite crystals) present in the inner ear of Osteichthyan fishes. The are three pairs (two sagittae, two asterisci and two lapilli). Otolithic end-organ. Structure of the Osteichthyan inner ear formed by an otolith, an otolithic membrane and an adjacent epithelium, including sensory epithelium (macula). The are three pairs (two sacculi, two lagenae and two utriculi). Postrostrum (Pr). Small expansion of posterior and ventral rim of the otolith sagitta, under the excisura minor. Pararostrum (Pa). Small expansion of posterior and dorsal rim, above the excisura minor. Rostrum (R). Anterior and ventral projection of the sagitta. In many especies is a very clear landmark. Sacculus (Sc). Otolithic end-organ placed in the pars inferior of the inner ear. In non-Ostariphysan fishes is the most developed end-organ. Sagitta (Sg). Otolith related with sacculus otolithic end-organ. Usually, it shows the highest variability between otoliths. Sulcus acusticus (Sa). A groove along the medial surface of the sagitta. Is closely associated with sensorial epithelium or macula. Utriculus (Ut). Otolithic end-organ placed in the anterior zone in the pars superior of the inner ear closed to semicircular channels. |
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