olfactory organs that are located on the roof of the nasal cavity. The olfactory epithelium is covered by a thin coat of mucus layer below and olfactory glands bounded connective tissues, above. It contains three types of cells : supporting cells, Basal cells and millions of pin shaped olfactory receptor cells (which are unusual bipolar cells). The olfactory glands and the supporting cells secrete the mucus.
The unmyelinated axons of the olfactory receptor cells are gathered to form the filaments of olfactory nerve [cranial nerve I] which synapse with cells of olfactory bulb. The impulse, through the olfactory nerves, is transmitted to the frontal the position, orientation and movement of the body. The organ of balance is known as the vestibular system which is located in the inner ear next to the cochlea. The vestibular system is composed of a series of fluid filled sacs and tubules.These sacs and tubules contain endolymph and are kept in the surrounding perilymph (Figure .
). These two fluids, perilymph and endolymph, respond to the mechanical forces, during changes occurring in body position and acceleration. $QWHULRU 3RVWHULRU /DWHUDO $PSXOODRI VHPLFLUFXODU GXFW 2YDOZLQGRZ 6HFRQGDU\W\PSDQLFPHPEUDQHLQURXQGZLQGRZ %RQ\ODE\ULQWK FRQWDLQVSHULO\PSK 0HPEUDQRXVODE\ULQWK FRQWDLQVHQGRO\PSK $PSXOODRIVHPLFLUFXODU FDQDO 8WULFOH 9HVWLEXOH 6DFFXOH &RFKOHD &RFKOHDU GXFW Figure . Organ of Equilibrium Name the parts of the organ of equilibrium involved in the following functions.
a) Linear movement of the body b) Changes in the body position c) Rotational movement of the head. The utricle and saccule are two membranous sacs, found nearest the cochlea and contain equilibrium receptor regions called maculae that are involved in detecting the linear movement of the head. The maculae contain the hair cells that act as mechanorecptors. These hair cells are embeded in a gelatinous otolithic membrane that contains small calcareous particles called otoliths .
This membrane adds weight to the top of the hair cells and increase the inertia. XI Std Biology-Zoology Chapter- lobe of the brain for identification of smell and the limbic system for the emotional responses to odour. Gustatory receptor: The sense of taste is considered to be the most pleasurable of