amphicoelian: Amphicœlous; having amphicœlous vertebræ; pertaining to the Amphicœlia.

8. Isolated sauropod remains including vertebrae and a humerus from the Aïn El Guettar Formation (Albian, Early Cretaceous) of Tunisia are described. Centrum of the 8th vertebra of frog is Amphicoelous. .) Topic 9—Vertebrae . Answer (1 of 6): biconcave —used of vertebrae (as those of certain reptiles) having both the anterior and posterior surfaces of the centrum concave. The vertebra is amphicoelous, with the posterior articular face markedly concave. The first vertebra in the frog is an atlas or cervical, ring-shaped to protect the skull. The body is small to moderate size, with 35 cm in length. The body is composed of cancellous bone, which is the spongy type of osseous tissue, whose microanatomy has been specifically studied within the pedicle bones. (zoology) Of or relating to the procoelians. The teleost backbone consists of amphicoelous vertebrae and intervertebral ligaments, both of which include notochord-derived structures.

Precaudal vertebra: (Fig. Fibrous intervertebral pads unite the centra.

Examples- Bufo, Hyla (upper jaw toothed). The important contribution . The meaning of amphicoelous is biconcave—used of vertebrae (as those of certain reptiles) having both the anterior and posterior surfaces of the centrum concave. With elongated transverse processes, the second to 7th vertebrae are procoelous. The clavicle and interclavicles form "V shaped furcula.

Convexity values are highest in the presacral and anterior caudal regions, apart from the low values adjacent to the sacrum, and diminish posteriorly along the tail, becoming abruptly amphiplatyan near mid-length coincident with several other anatomical changes. Hint: Vertebrae of the birds have saddle shaped ends, on one axis it is concave and on the other axis it is convex. The vertebrae of Placodontia are characterised by high and nar- row neural canals, elongated transverse processes, and deeply amphicoelous and notochordal centra (Rieppel, 2000: 12). The eighth vertebra is amphicoelous, and the ninth vertebra is biconvex, connected to the posterior side of the urostyle. 42.22B) 1. A type of vertebrae in which both anterior and posterior surface of the centrum are concave.

5A, B). Other articles where amphicoelous vertebra is discussed: Caudata: Bones and cartilage: …vertebrae are said to be amphicoelous (biconcave, or depressed on both the anterior and posterior sides), but, if it mineralizes or ossifies, the vertebrae are termed opisthocoelous (bulged on the anterior side and depressed on the posterior side). No bone mass increase nor decrease occurs. The vertebrae are generally without epiphyses to their centra. 4.3 Comparison with other amphicoelous vertebrae. A normal amphicoelous vertebra is expected to have a length ratio of one; therefore to check whether the differences in curved vertebrae numbers 6, 10 and 11 are indicative of vertebral wedging, we tested whether the mean values from all vertebrae are significantly different from one (t-test, α = 0.05). Paired transverse processes, with facets for articulation of ribs. A vertebra can classified in terms of the shape of the ends of the centra (Body of the vertebrae) into Procoelus, Amphicoelous and Acoelous vertebrae.
No amphicoelous vertebrae were observed. Fig. The centra are amphicoelous (see Kardong, Figure 8.4) and originate from both the notochordal sheath and surrounding perichordal mesenchyme. What does amphicoelous mean? Skeletal synapomorphies include: (1) lateral processes of the nuchal bone are extensive, (2) the plastron and carapace maintain a ligamentous connection, and (3) The caudal (tail) vertebrae have the following pattern: a single procoelous vertebra is most anterior, followed by a single amphicoelous vertebra; all remaining vertebrae are . 8-2A , 8-8B; A Morton Salmon Vertebral Morphology amphibians, some 'reptiles'_____ vertebrae Increased robustness Closer articulation Increased elaboration Photo: M Taylor • Opisthocoelous -many Vertebrae include a slightly procoelous anterior caudal vertebra, amphicoelous middle caudal vertebrae, and strongly procoelous distal caudal vertebrae. Neural spine - spinous process that projects dorsally from the neural arch Centrum - body of the vertebra which replaces the notochord; shape depends on the vertebrate class (Fig. 3. (adjective)

The earliest that we know had amphicoelous vertebrae throughout the column, but most others have an extraordinary combination of all types, amphicoelous, procoelous, opisthocoelous, plano-concave, plano-convex, and even biconvex, otherwise known in only the first caudal vertebra of the procoelian crocodiles. Cervical vertebrae are the vertebrae present in the neck region of the body, immediately below the skull. Amphicoelias (/ ˌ æ m f ɪ ˈ s iː l i ə s /, meaning "biconcave", from the Greek ἀμφί, amphi: "on both sides", and κοῖλος, koilos: "hollow, concave") is a genus of herbivorous sauropod dinosaur that lived approximately 150 million years ago during the Tithonian (Late Jurassic Period) of what is now Colorado, United States.A herbivore, Amphicoelias was moderately sized at about . Concave on both sides, as the vertebrae of certain fishes. Look it up now! vertebra in the center. 2. (adjective)
No amphicoelous vertebrae were observed. Vertebrae are amphicoelous.

Omphalosaurus have lost the neural arch atop the centra of the vertebrae. Eighth vertebra is amphicoelous. smaller diapophysis of the . The tail vertebrae were amphicoelous, the vertebral bodies on both ends being concave. Vertebral bodies of teleost fish are formed by the sclerotomal bone covering the chordacentrum. The vertebrae of trunk region are amphicoelous, i.e., the centrum bears concavities on anterior as well as posterior surfaces. First seven vertebrae are procoelous. This vertebra is also amphicoelous, but with the anterior articular face more concave than the posterior. The teleost vertebral column is composed of amphicoelous (hour-glass shaped) vertebrae and intervertebral ligaments, which consist of both notochord-and somitederived tissues (Laerm, 1976) and in . opistocoelous vertebrae. Source for information on amphicoelous vertebrae: A Dictionary of Zoology dictionary. Every vertebra has a body, which consists of a large anterior middle portion called the centrum (plural centra) and a posterior vertebral arch, also called a neural arch. A possible Pararcus diepenbroeki vertebra from the Vossenveld Formation (Triassic, Anisian), Winterswijk, the Netherlands - Volume 96 Issue 1 2. The ossification of the vertebral pad. mostly procoelous, one aceolous, biconvex first caudal. Zygapophyses Not only the centra, neural spines, and ribs are relevant for the mobility of the vertebral column, but the zygapophyses are also important.

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