HDFS201 Lecture Notes - Lecture 12: Olfactory Nerve, Olfactory Epithelium, Olfaction
14 Oct 2016
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Gustation, olfaction, touch senses: prenatal swallowing & sucking rates, measures: facial expressions, sucking rate, duration, swallowing, spitting. Mouth & oral stage (3rd hand: developmental changes. Taste buds present and functional before 4th month post-conception. Born with preference for sweetness-mother"s breast milk & gaining weight. Next developed is salt; sour and bitter are avoided to warn of poisons. After 50 years old: sweet & salt> bitter. Some loss of taste buds with age. 6 days after birth: can distinguish between mother"s smell by breast pads. 14 days after birth: axillary odors; body odors of mother: changes in smell with age. Can begin decline as early as 20. Greater decline beyond 60, but overall, little decline with age. Interacts with taste to influence enjoyment of food. Touch/mechanoreceptor sense: 1st sense to develop & last to leave, most important for survival & most complex and complicated, most proximal (closeby stimuli); least understood; reflexes & touch, touch changes with age.
