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  2. Suture (anatomy) - Wikipedia

    en.wikipedia.org/wiki/Suture_(anatomy)

    In anatomy, a suture is a fairly rigid joint between two or more hard elements of an organism, with or without significant overlap of the elements. [ 1 ] Sutures are found in the skeletons or exoskeletons of a wide range of animals, in both invertebrates and vertebrates .

  3. Siphuncle - Wikipedia

    en.wikipedia.org/wiki/Siphuncle

    In most fossil nautiluses, the siphuncle runs more or less through the center of each chamber, but in ammonites and belemnites it usually runs along the ventral edge of the shell. In some fossil straight shelled nautiloids, cylindrical calcareous growths ("siphuncular deposits") around the siphuncle can be seen towards the apex of the shell.

  4. Ammonoidea - Wikipedia

    en.wikipedia.org/wiki/Ammonoidea

    The external or ventral region refers to sutures along the lower (outer) edge of the shell, where the left and right suture lines meet. The external (or ventral) saddle, when present, lies directly on the lower midline of the shell. As a result, it is often called the median saddle. On suture diagrams the median saddle is supplied with an arrow ...

  5. Outline of human anatomy - Wikipedia

    en.wikipedia.org/wiki/Outline_of_human_anatomy

    Human anatomy is the scientific study of the morphology of the adult human. It is subdivided into gross anatomy and microscopic anatomy . Gross anatomy (also called topographical anatomy, regional anatomy, or anthropotomy) is the study of anatomical structures that can be seen by unaided vision.

  6. Septum (cephalopod) - Wikipedia

    en.wikipedia.org/wiki/Septum_(cephalopod)

    The septa are attached to the inside wall of the shell, thus dividing the phragmocone into camerae. Where the septum meets the shell a suture line forms; in some ammonoids these lines became extremely complex and elaborate, providing strength without the necessity of added weight. Elaborate sutures allowed for thinner shells, and hence less ...

  7. Anatomical terms of location - Wikipedia

    en.wikipedia.org/wiki/Anatomical_terms_of_location

    These two terms, used in anatomy and embryology, describe something at the back (dorsal) or front/belly (ventral) of an organism. [2] The dorsal (from Latin dorsum 'back') surface of an organism refers to the back, or upper side, of an organism. If talking about the skull, the dorsal side is the top. [38]

  8. Index of anatomy articles - Wikipedia

    en.wikipedia.org/wiki/Index_of_anatomy_articles

    ventral amygdalofugal pathway; ventral anterior thalamic nucleus; ventral cochlear nucleus; ventral corticospinal tract; ventral horn cell; ventral lateral nucleus of thalamus; ventral posterolateral nucleus; ventral posterolateral thalamus; ventral posteromedial nucleus; ventral root; ventral spinocerebellar tract; ventral trigeminothalamic ...

  9. Umbilicus (mollusc) - Wikipedia

    en.wikipedia.org/wiki/Umbilicus_(mollusc)

    The umbilicus of a shell is the axially aligned, hollow cone-shaped space within the whorls of a coiled mollusc shell. The term umbilicus is often used in descriptions of gastropod shells, i.e. it is a feature present on the ventral (or under) side of many (but not all) snail shells, including some species of sea snails, land snails, and ...