BIOL 382 Lecture Notes - Lecture 12: Trichromacy, Ciliary Muscle, Opsin
Document Summary
Statocysts are the organ of equilibrium in invertebrates. They are hollow, fluid filled cavities lined with mechanosensory neurons. Movement of statoliths stimulate mechanoreceptor cells with send a signal to the nervous system. What are the two ways that insects hear: trichoid sinsilla. Katydids have a tympanum that is connected to leverlike structures which are connected to an inner fluid filled chamber. The chamber contains mechanosensitive cells that are functionally similar to the mammalian ear. K+ channels open and allow ca2+ in when cilia tilt towards kinocilium. Neuromasts are structures that can detect water movements. They consist of hair cells embedded in a gelatinous cap (cupula). They are found scattered over the body or in the lateral line system. Three semi-circular canals with enlarged region at one end (ampulla) The lagena is an extension of the saccule. It is extended into a cochlear duct or cochlea for hearing.
