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  2. Coxal gland - Wikipedia

    en.wikipedia.org/wiki/Coxal_gland

    The coxal gland is thought to be homologous with the antennal gland of crustaceans. The gland consists of an end sac (saccule), a long duct (labyrinth) and a terminal bladder (reservoir). [2] There is generally only one pair (two in some spiders), and they open on the coxae of the walking legs [1] or at the base of the second antennae in the ...

  3. Pain in crustaceans - Wikipedia

    en.wikipedia.org/wiki/Pain_in_crustaceans

    Pain has the adaptive advantage that it invokes a level of learning, thereby preventing the animal from repeatedly exposing itself to potential injury. [36] Pain cannot be directly measured in other animals, including other humans; responses to putatively painful stimuli can be measured, but not the experience itself.

  4. Nephridium - Wikipedia

    en.wikipedia.org/wiki/Nephridium

    In Crustacea, the saccate metanephridia are associated with the antennae and form the antennal gland. In freshwater crustacea , the saccate metanephridia are especially large due to their role in osmoregulation; crustacea must remove large amounts of water from the tissues, as the cells are hypertonic to the surrounding water.

  5. Are crunches a pain in the neck? Try this ab exercise instead

    www.aol.com/regular-crunches-hurt-neck-ab...

    Neck pain is an especially common complaint when people do abdominal crunches. Although crunches seem easy, research suggests that they can increase the risk of low-back pain when they’re not ...

  6. Ionocyte - Wikipedia

    en.wikipedia.org/wiki/Ionocyte

    An ionocyte (formerly called a chloride cell) is a mitochondrion-rich cell within ionoregulatory organs of animals, such as teleost fish gill, insect Malpighian tubules, crustacean gills, antennal glands and maxillary glands, and copepod Crusalis organs. [1]

  7. Longus colli muscle - Wikipedia

    en.wikipedia.org/wiki/Longus_colli_muscle

    Acute calcific tendinitis of the longus colli muscle can occur. This presents with acute onset of neck pain, stiffness, dysphagia and odynophagia, and must be distinguished from retropharyngeal abscess and other sinister conditions. Imaging diagnosis is by CT or MRI, demonstrating calcification in the muscle in addition to retropharyngeal oedema.

  8. Arthropod head problem - Wikipedia

    en.wikipedia.org/wiki/Arthropod_head_problem

    Its innervation from the rear of the brain has suggested to some workers that, if an appendage, it is the appendage of the tritocerebral segment; a point disputed by others who argue that the presence of a well-developed appendage in at least crustaceans in this segment (i.e., the second antenna, corresponding to the intercalary segment of ...

  9. Antenna (zoology) - Wikipedia

    en.wikipedia.org/wiki/Antenna_(biology)

    Antennae (sg.: antenna) (sometimes referred to as "feelers") are paired appendages used for sensing in arthropods. Antennae are connected to the first one or two segments of the arthropod head. They vary widely in form but are always made of one or more jointed segments.

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