Question

Topic 4: Lab 3 Senses general and vision: discuss the functions and applications of the different aspects of the senses and tie it into the lab material.

Topic 5: Lab 4 smell, taste, and hearing: So think about it. you can include ideas to improve the lab in an online setting, explanations of exactly the why and how of sensation, in other words don't use the word for the different modalities but describe the process. why are balance and hearing tied together? what is the difference between conduction deafness and Sensorineural hearing loss, what are the different structures involved? why would the Rinne and Weber test tell you different things? Impress me with what kind of thinking you can do outside the box, be independent, be imaginative.

Answer 1

Functions of scensesl

• Touch
• Smell
• Taste
• Hearing

Sensation process

It is process by which sensory receptors and nervous system receive and represent stimulus energy Senses are physiological method of perception. Perception is process of organizing and interpreting sensory information, enabling us to recognize a meaningful objects and events.

Balance and hearing

Ear consists of inner, middle and outer ear. Outer ear collect sound wave to ear drum and eardrum sheet of tissue which separate the outer ear from middle ear. Middle ear contains bones and oval window. The bone of middle ear transmit the vibrations to the oval windows on the cochlea inner ear contains cochlea which is the actual hearing organ.

Inner ear is the organ of balance. Vestibule (utricle and saccule) are called macula and semicircular canals are balance receptors. As the head move a shift in the position if the cilia. Nerve fibers from vestibule and semicircular canal form vestibular nerve which join cochlea form vestibular cochlear nerve the eighth cranial nerve.

Vestibular cochlear nerve transmit sound and equilibrium.

Conductive hearing loss

Middle or external ear defects. Sound waves do not reach organ of corti. Otitis media, cerumen, otosclerosis, trauma are the etiologies.

Sensoy hearing loss

Inner ear defect ie, damage to cochlea, cochlear nerve caused by ototoxic drugs, menin gitis, CVA.

Rinne test Air conduction is better than bone conduction In conductive hearing liss patients does not hear vibration in air after bone conduction is over. In complete sensory neural deafness no sound in both air and bone

weber's test Hears equally on both sides Hears the sound louder in diseased ear. Hears the sound louder in normal ear.