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Author: admin, 14.10.2014
It might be hard to believe, but cat ears contain over two dozen muscles, enabling them to do an Exorcist-like 180-degree swivel forward, backward, up and down. The Alert and Interested Cat – When your cat is alert and something has captured her interest, her ears will assume a straight-up orientation, and a forward posture as in Figure 2 (see chart). Attack Mode – When the ears flatten against the head in a defensive position as in Figure 4, your cat is frightened and may attack.
Your cat’s tail is like a big old apostrophe at the end of her body that puts a fine point on affection, aggression, fear and happiness. You also don’t want to mess with your cat when her tail is in a position of defensive aggression. A happy cat holds her tail high, and if she greets you at the door with her tail quivering, she’s happy to see you. While every effort has been made to follow citation style rules, there may be some discrepancies. The cochlear hair cells are located in the organ of Corti, a small organ found in the scala media within the cochlea in the ear.
When the stapes, a small bone that is part of the middle ear, is stimulated to remove from the oval window, a K+ rich fluid called endolymph rushes into the cochlea.
Inner hair cells are important because they innervate spiral ganglion and transmit most of the information. Although some animals such as birds can regenerate hair cells, mammals cannot regenerate cochlear hair cells. Although they pan around like radar dishes scanning for sounds, they’re not just for hearing. She instinctively keeps her ears flat against her head in attack mode to protect her ears from claws and teeth during a fight. When they’re in different positions, the cat is ambivalent and unsure of how to respond.

One of the most primal tail movements is the violent back-and-forth swish, sometimes called a Sword Tail. You don’t want to pick up the aggressor at this point, but a few squirts with a squirt gun can persuade him to beat a retreat. There’s poetry in the way a contented cat will artfully wrap her tail around her, or in the way a Balinese will proudly strut her tail like a flame behind her.
Hair cells sit on the basilar membrane and have an overhead cover called the reticular lamina.
Inner hair cells are far less in number, approximately 3500, then outer hair cells which can number up to 20,000 in each ear. This change in fluid amount causes a bend in the basilar membrane, which in turn, bends the reticular lamina, rods of Corti, and the tectorial membrane. The inner hair cells are low in numbers compared to the outer hair cells; however, the inner hair cells transmit most of the information. With proteins in the membrane, the length of the outer hair cells are changed when endolymph is in the cochlea. If you notice that your cat’s ear are maintaining a horizontal orientation on a regular basis, she could have an ear infection or ear mites, and a trip to the vet is warranted. This indicates that something has attracted her attention, and she is very nervous, defensive, and unsure of her surroundings. Of the two, sound was much easier to understand, and people began discovering facts about sound at an early date.
Two structures called the rods of Corti support the reticular lamina and the basilar membrane. The direction of the movement of the stereocilia determines whether the cell depolarizes or hyperpolarizes. The inner cells are located in between the modiolus and the rods of Corti, while the outer cells are located on the other side of the rods of Corti.

For this reason, several spiral ganglion synapse with the inner hair cells, and not so many synapse with the outer hair cells. The changing of the outer hair cells result in more bending of the inner hair cells, which creates innervation with the spiral ganglion. In humans, technology has been introduced that allows people who are deaf to hear again by a device called cochlear implants.
The vibrations from the source disturb the air in such a way that sound waves are produced.
Both cells are innervated by the spiral ganglion which transmits signals to the auditory nerve and eventually to the auditory cortex in the brain. On the tip of each stereocilia is a channel called transient receptor potential A1 channels or TRPA1, which allows for the inflow of K+ into the hair cell. Cochlear hairs cells get their name from special structures called stereocilia that cover each cell making them look hairy.
Mulroy (1980)"The organization of actin filaments in the stereocilia of cochlear hair cells", The Journal of Cell Biology, Vol 86, 244-259.
With stimulation, the stereocilia bend which cause a signal that goes to the auditory nerve and eventually to the auditory cortex allowing sound to be processed by the brain.
As the stereocilia bend each way, the "doors" to the channels open allowing K+ into the hair cell or close preventing K+ overflow.
This unique physiological property is due to the extremely high concentration of K+ in the endolymph which results in a high equilibrium potential for K+ of 0 mV. With a surge of K+ influx into the cell, the calcium channels are activated to open, which in turn activates the release of glutamate in the synapse with the spiral ganglion.

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