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  • continued from the  Brain Page of Nervous System

    Contents

    Neurons and Nerves
    neurotransmitter
    The Brain & Spinal Cord
    Cranial Nerves
    Peripheral Nervous System
    Autonomic Nervous System
    Senses: Eye diagrams, Hearing, Smell, Taste, Taste & Tongue Sensation, Balance
    Memory , Memory types, Creation of Memory,
    Higher Functions
    Altered States

    [Top]

    Taste (see location of the various components in Figure 09):

    • Tongue - Embedded within the surface of the tongue are four types of taste receptors localized in specific regions on the
      Tongue Papillae tongue (see Figure 19). Each detects a different class of chemical: sweet (sugars), sour (acids), bitter (complex organics), and salty (salts). The "hot" sensation of foods such as chili peppers is detected by pain receptors, not chemical receptors. But a report in 2006 reveals that contrary to popular belief, there is no tongue map. Responsiveness to the five basic modalities - bitter, sour, sweet salty and umami (a Japanese word

      Figure 19 Tongue
      [view large image]

      Figure 20 Papillae [view large image]


       
      meaning the savory or meaty taste of amino acids) is present in all areas of the tongue.

       
  • Papillae - The papillae are those small elevations visible to the naked eyes. There are three types of papillae located from the back of the tongue toward the tip. Filiform papillae are generally conical or pointed; fungiform papillae are flat-toped; vallate papillae are larger with an outer groove (see Figure 20). Many taste buds lie along the walls of the papillae. Isolated ones also are present on the palate, the pharynx, and the epiglottis.
    Sense of Taste
  • Taste buds - The tasting, or gustatory, cells in the buds have hairy tips which detect chemicals in solution (secreted by the gland at the bottom of papilla). When stimulated by flavor molecules, these cells generate nerve signals, which they send to the taste center on the brain's cortex, and also to the hypothalamus, which is concerned with appetite and the salivating reflex.
  • Taste nerve pathway - The nerve signals are carried by three nerves in each side of the tongue (cranial nerves) to a small part of the medulla (brain stem). The signals then travel to parts of the brain, such as the hypothalamus, the thalamus, and the gustatory part of the sensory cortex - the "taste center", where the signals are interpreted (Figure 21). The thalamus acts like a relay station, shunting the data onto appropriate cortical areas for processing. The sense of taste tells us what is good to eat. It evolved to pick out sweet, ripe fruits and energy-packed sugars
  • Figure 21 Sense of Taste
    [view large image]

    and starches. Likewise, taste is is extremely sensitive to bitter flavors, because many poisonous berries, fruits and fungi are bitter-tasting.

     
      Sensations (see location of the various components in Figure 09):

       
    • Skin - Skin has a thin epidermis, which is mainly for protection, and a thicker dermis below. In addition to small blood vessels and sweat glands, it has tiny nerve endings in the various type of touch receptors (see Figure 09).
    • Receptors -
      • Bulb of Krause - These are multi-layered capsules with many branched nerve endings. They are quick-change mechanoreceptors, triggered by rapid alterations in shap caused by pressure or vibrations, and may also help us to feel extreme cold.
      • Free nerve endings - They have a treelike branching system of naked nerve fibers. They are the most common sensory endings in the skin and detect just about anything - light touch, heavy pressure, heat, cold, and importantly, pain. Slight stimulation of these nerve endings may elicit the sensation that is known as itching.
      • Meissner's endings - They are found in the uppermost part of the dermis, especially on the hands, feet, lips, and inner surfaces of the eyelids. They are shaped like eggs and are both quick- and slow-change mechanoreceptors, detecting light touch and vibrations.
      • Merkel's endings - They are like tiny disks stuck in the underside of the epidermis, where they feel slight changes in its shape, thereby detecting light touch. They are both quick- and slow-change mechanoreceptors.
      • Pacinian endings - They have layers like an onion and are sited deep in the dermis. They pick up heavy pressure and also fast vibrations, such as those from a tuning fork.
      • Ruffini endings - They respond to sustained stress or gradually altering shape. This means that they are slow-change mechanoreceptors. They are found mainly in hairy skin and are sausage- or spindle-shaped. It is thought that they may also detect extreme heat.
    • Proprioceptors - The sense of position and movement of limbs is dependent upon receptors termed proprioceptors (Figure 22a). They are located in the joints and associated ligaments and tendons that respond to stretching, pressure, and pain. Nerve endings from these receptors are integrated with those received from other types of receptors so that we know the position of body parts.
    • Sensory nerves - Nerve impulses may reach the somatosensory cortex for analysis before a response is decided. These result in voluntary actions - a deliberate response. Sometimes the stimulus require immediate action (such as from the burning sensation), a reflex action is taken without the conscious control of the brain. These are the involuntary actions directed by the spinal cord. We only become aware of them when other impulses are sent to the brain to "inform" what has happened. The path which impulses travel along during a reflex action is called a reflex arc. Not all the body parts
  • Continue to Homunculus page

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