Theria
Theria (superclass Gnathostomata, class Mammalia) A subclass that comprises the three infraclasses Pantotheria (extinct ancestral forms), Metatheria (marsupials), and Eutheria (placental mammals), distinguished from the Prototheria principally by their teeth and by the structure of the sides of the skull, formed in therians by large squamosal and alisphenoid bones.
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Cheek bone , zygomatic arch (zygoma) The bone at the side of the skull which forms an arch from beneath the orbit to a position toward the back of the head. It is… hydroxyapatite , hydroxyapatite A hydrated calcium phosphate mineral, which also contains fluoride, chloride, and carbonate calcium salts. It is often formed as a con… Skull , Skull
Definition
The skull—or cranium—is the skeleton of the head. It includes the brain case and the bones of the face and jaw.
Description
The skul… Musculoskeletal System , Skeletal System Overview (Morphology)
When death has occurred weeks or months before a body is discovered, decomposition removes much of the body flu… Bone , bone Fairly early in the evolution of multicellular organisms it became an advantage to have a hard body component which could provide protection for… epiphysis , epiphysis (i-pif-i-sis) n. (pl. epiphyses)
1. the end of a long bone, which is initially separated by cartilage from the shaft (diaphysis) of the bon…
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Theria