9/19/2023 0 Comments Frog dissection diagram labeled![]() ![]() Initially, X‐ray CT was used to study high‐density materials such as the mineralized vertebrate skeleton (Bever et al., 2005 Carpenter et al., 2004 Maisano et al., 2002 Rowe et al., 2005) or fossils (Polcyn et al., 2002 Tykoski et al., 2002), which can be easily visualized via thresholding or other automatic segmentation methods. Since the beginning of this century, morphological studies hugely profited from advances in imaging techniques such as X‐ray computed tomography (CT) and from image processing and analysis tools. gayi is able to employ various methods of feeding. Nevertheless, by keeping a certain amount of flexibility of the design of its feeding apparatus, C. gayi provide a clear picture of necessities prescribed by the habitat. pentadactylus, the skeletal and muscular adaptations of the aquatic species C. This study brings new insights into the relation of the anatomy of the feeding apparatus to the preferred feeding method via 3D imaging techniques. Moreover, due to the different skull morphology, the origins of two of the five musculi adductores vary between the species. sternohyoideus) is more massive in the aquatic species C. pentadactylus is more massively built and with a broader interdigitating area of the two main muscles, the protractor musculus genioglossus and the retractor musculus hyoglossus. Differences in this regard are evident in the tongue musculature, which in L. ![]() MicroCT scans of both species were conducted in order to reconstruct the complete anatomical condition of the whole feeding apparatus for the first time. These two frog species are of similar size, feed on similar diet but within different main habitats. This called for a detailed investigation of the morphology of its feeding apparatus and a comparison to a fully terrestrial species that is known to feed by lingual prehension such as Leptodactylus pentadactylus. Calyptocephalella gayi, known for its aquatic lifestyle, is not restricted to aquatic feeding but also feeds terrestrially using lingual prehension. ![]() Here, we present the cranial anatomy of two frog species providing descriptions of bone structures and soft tissues of the feeding apparatus with comments to possible relations to habitat and feeding ecology. Grade Level: 8-12 | Time Required: 1 – 1.Micro‐computed tomography (microCT) of small animals has led to a more detailed and more accurate three‐dimensional (3D) view on different anatomical structures in the last years. ![]() Specimens can be ordered from biological supply companies or through Amazon. The last task for students to complete is the removal of the frog’s brain and hind limb bones (femur and tibofibula). Students continue their exploration by examining the structures of the digestive and urinary systems. A set of questions at the end of the activity check for understanding. Instructions explain how to open the body cavity of the frog using scissors. A diagram showing the mouth of the frog is labeled from the descriptions. Each task includes an explanation of the structure and its function. A probe inserted into the eustachian tubes reveals that the openings connect to the tympanic membrane. Next, they examine the mouth where they find structures such as the glottis and esophagus. They also measure the length of frog’s and compare to other specimens. The task begins with the external anatomy, where students examine the head and feet of the frog. Detailed descriptions help students locate structures. Students check boxes as they complete tasks, such as the removal of the frog’s tongue. The front page contains a list of structures students are responsible for identifying. This student guide (dissection manual) walks students through the frog dissection. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |