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  2. Haemal arch - Wikipedia

    en.wikipedia.org/wiki/Haemal_arch

    A haemal arch, also known as a chevron, is a bony arch on the ventral side of a tail vertebra of a vertebrate. The canal formed by the space between the arch and the vertebral body is the haemal canal. A spinous ventral process emerging from the haemal arch is referred to as the haemal spine. Blood vessels to and from the tail run through the arch.

  3. Activity-regulated cytoskeleton-associated protein - Wikipedia

    en.wikipedia.org/wiki/Activity-regulated...

    Activity-regulated cytoskeleton-associated protein is a plasticity protein that in humans is encoded by the ARC gene. The gene is believed to derive from a retrotransposon . [ 5 ] The protein is found in the neurons of tetrapods and other animals where it can form virus-like capsids that transport RNA between neurons.

  4. Chevron (insignia) - Wikipedia

    en.wikipedia.org/wiki/Chevron_(insignia)

    A chevron (also spelled cheveron, especially in older documents) is a V-shaped mark or symbol, often inverted. The word is usually used in reference to a kind of fret in architecture , or to a badge or insignia used in military or police uniforms to indicate rank or length of service, or in heraldry and the designs of flags (see flag terminology ).

  5. Pharyngeal arch - Wikipedia

    en.wikipedia.org/wiki/Pharyngeal_arch

    The nerve of the arch itself runs along the cranial side of the arch and is called post-trematic nerve of the arch. Each arch also receives a branch from the nerve of the succeeding arch called the pre-trematic nerve which runs along the caudal border of the arch. In human embryo, a double innervation is seen only in the first pharyngeal arch.

  6. United States Army enlisted rank insignia - Wikipedia

    en.wikipedia.org/wiki/United_States_Army...

    This precluded the use of epaulets. Rank was shown by a single, point up, chevron. Sergeants major and quartermaster sergeants wore the chevron on both upper sleeves, principal musicians and sergeants on both lower sleeves and corporals on the right upper sleeve. The chevrons were yellow for artillery and white for infantry.

  7. Reflex arc - Wikipedia

    en.wikipedia.org/wiki/Reflex_arc

    A reflex arc, then, is the pathway followed by nerves which (a.) carry sensory information from the receptor to the spinal cord, and then (b.) carry the response generated by the spinal cord to effector organs during a reflex action. The pathway taken by the nerve impulse to accomplish a reflex action is called the reflex arc.

  8. United States Army enlisted rank insignia 1851–1901 - Wikipedia

    en.wikipedia.org/wiki/United_States_Army_enlisted...

    The chevron system would carry on from the 1847 system with sergeants major wearing three chevrons and three arcs, quartermaster sergeants three chevrons and three ties, first sergeants threes chevrons and a lozenge, sergeants three chevrons and corporals two chevrons, with the addition of ordnance sergeants wearing three chevrons and a star.

  9. List of reflexes - Wikipedia

    en.wikipedia.org/wiki/List_of_reflexes

    A list of reflexes in humans. Abdominal reflex; Accommodation reflex — coordinated changes in the vergence, lens shape and pupil size when looking at a distant object after a near object. Acoustic reflex or attenuation reflex — contraction of the stapedius and tensor tympani muscles in the middle ear in response to high sound intensities.