In a starfish, the ambulacral ossicles are little calcified bony plates covering the radial canal.
Echinoderms can have ambulacral parts that include ossicles, plates, spines, and suckers. For example, sea stars or "star fish" have an ambulacral groove on their oral side (underside). This ambulacral groove extends from the mouth to the end of each ray or arm. Each groove of each arm in turn has four rows of hollow tube feet that can be extended or withdrawn. Opposite the ambulacral groove is an ambulacral ridge on the aboral side of each ray.
An ambulacral is another word for an ambulacrum, a row of pores of an echinoderm for the protrusion of appendages such as tube feet.
The function of the ambulacral groove on a starfish is to open the shells of bivalves. It also hold the tubed feet of the starfish.
locomotion
It is the ossicles :)
Fusion or fixation of the ossicles is where one or more of the three auditory ossicles cannot transmit sound vibrations for a variety of reasons. This does cause "conduction" deafness or hearing loss.
YES, but it is not the same "ossicles" that are found in the mammal ear. Echinoderm ossicles are small calcium-matrix plates that make up the dermis or endoskeleton of the echinoderm. They provide protection and support to the underlying tissue.
Ossicles
If there is a change to the basic structure or functioning ability of your auditory ossicles, this would result in Conductive Deafness as the ossicles will not be able to transmit and amplify the sound vibrations from the tympanic membrane to the oval window.
The word "ossicle" means "little bone" The sea cucumber has calcified structures just under the skin which are called microscopic ossicles or sclerietes. There are many of these ossicles which are remnants of a previous endoskeleton.
They make up the skeleton and protect internal structures.
One cause of "Conductive Hearing Loss" can be due to the trauma and subsequent fracture of one or more ossicles, as well as the fracture of the temporal bone which houses the middle ear with its ossicles. Conductive deafness is due to the inability of the ossicles to conduct the sound vibrations from the tympanic membrane to the oval window.