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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]
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]
An imaginal disc is one of the parts of a holometabolous insect larva that will become a portion of the outside of the adult insect during the pupal transformation to the imago. [1] Contained within the body of the larva, there are pairs of discs that will form, for instance, the wings or legs or antennae or other structures in the adult.
This is a matter of definitions. If a structure was once called vestigial, but is now known to be functional, then calling it "Functioning Vestigial Structures" violates the definition of vestigial, because by definition, it is not vestigial. It was previously called vestigial, but that was a mistake.
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Both of these sides have transverse grooves that show where the vestigial coccygeal units had previously fused. The coccyx attaches to the sacrum from the dorsal grooves, with the attachment being either a symphysis or as a true synovial joint , and also to the gluteus maximus muscle , the coccygeal muscle , and the anococcygeal ligament .
There is a vestigial disc-like sucker between the pelvic fins. The maximum length of a common shore eel is 12 centimetres (4.7 in) in total length. [1] Distribution
An intervertebral disc (British English), also spelled intervertebral disk (American English), lies between adjacent vertebrae in the vertebral column.Each disc forms a fibrocartilaginous joint (a symphysis), to allow slight movement of the vertebrae, to act as a ligament to hold the vertebrae together, and to function as a shock absorber for the spine.