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Appendix testis, a vestigial remnant of the Müllerian duct; Epiploic appendix, one of several small pouches of fat on the peritoneum along the colon and rectum Appendix of the laryngeal ventricle, a sac that extends from the laryngeal ventricle; Mesoappendix, the portion of the mesentery that connects the ileum to the vermiform appendix
Ileum, caecum and colon of rabbit, showing Appendix vermiformis on fully functional caecum The human vermiform appendix on the vestigial caecum. The appendix was once believed to be a vestige of a redundant organ that in ancestral species had digestive functions, much as it still does in extant species in which intestinal flora hydrolyze cellulose and similar indigestible plant materials. [10]
In humans, the vermiform appendix is sometimes called a vestigial structure as it has lost much of its ancestral digestive function.. Vestigiality is the retention, during the process of evolution, of genetically determined structures or attributes that have lost some or all of the ancestral function in a given species. [1]
Plant anatomy or phytotomy is the general term for the study of the internal structure of plants. Originally, it included plant morphology , the description of the physical form and external structure of plants, but since the mid-20th century, plant anatomy has been considered a separate field referring only to internal plant structure.
A relationship exists between the anatomy of the stem node and the presence or absence of stipules: most plants with trilacunar nodes have stipules; species with unilacunar nodes lack stipules. [ 3 ] Stipules are morphologically variable and might appear as glands , scales, hairs , spines , or laminar (leaf-like) structures.
A plant which completes its life cycle (i.e. germinates, reproduces, and dies) within two years or growing seasons. Biennial plants usually form a basal rosette of leaves in the first year and then flower and fruit in the second year. bifid Forked; cut in two for about half its length. Compare trifid. bifoliate
While the Vermes is no longer a taxonomic group, anatomists continue to use the description "vermiform" of animals or organs that are worm-shaped. The word root is Latin, vermes (worms) and formes (shaped). [3] A well known example is the vermiform appendix, a small, blind section of the gut in humans and a number of other mammals. [4]
Plant development is the process by which structures originate and mature as a plant grows. It is a subject studies in plant anatomy and plant physiology as well as plant morphology. The process of development in plants is fundamentally different from that seen in vertebrate animals. When an animal embryo begins to develop, it will very early ...