Scientific Objections: Even on the purely biological plane there is a wide, unbridgeable chasm between man and beast, as illustrated by the following four considerations: 1  The human brain possesses qualities [G2, p. 115â130] that have no parallel in the animal world. One consequence is manâs explicit mental capabilities.
Olfactory System. The olfactory system is responsible for our sense of smell. This sense, also known as olfaction, is one of our five main senses and involves the detection and identification of molecules in the air. Once detected by sensory organs, nerve signals are sent to the brain where the signals are processed. Our sense of smell is closely linked our sense of taste as both rely on the perception of molecules. It is our sense of smell that allows us to detect the flavors in the foods we eat. Olfaction is one of our most powerful senses. Our sense of smell can ignite memories as well as influence our mood and behavior. Olfactory System Structures. Our sense of smell is a complex process that depends on sensory organs, nerves, and the brain. Structures of the olfactory system include:
That ability starts at about 30 weeks; before that time, tissues plug up the nasal cavities. The sense of smell begins developing much earlier, as olfactory epithelial cells form in a fetus at 9 weeks along with nostrils. These cells connect to molecules that bind with the olfactory nerve (which leads to the brain). After your baby develops a sense of smell, he can actually smell everything that you eat or inhale. The lesson: Mom should eat what she wants her baby to like to smell. More About this Book