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Obliquely striated muscle is intermediate between the other two.
The history of anatomy is characterized by a progressive understanding of the functions of the organs and structures of the human body.
The bones of mammals are well ossified and their teeth, which are usually differentiated, are coated in a layer of prismatic enamel.
The teeth are shed once (milk teeth) during the animal's lifetime or not at all, as is the case in cetaceans.
Muscle cells (myocytes) form the active contractile tissue of the body.
Muscle tissue functions to produce force and cause motion, either locomotion or movement within internal organs.
Some species are ovoviviparous and the young develop internally but others are oviparous and the larvae develop externally in egg cases.
The bony fish lineage shows more derived anatomical traits, often with major evolutionary changes from the features of ancient fish.They mostly have four limbs but some aquatic mammals have no limbs or limbs modified into fins and the forelimbs of bats are modified into wings.The legs of most mammals are situated below the trunk, which is held well clear of the ground.It contracts slowly but maintains contractibility over a wide range of stretch lengths.It is found in such organs as sea anemone tentacles and the body wall of sea cucumbers.In higher animals striated muscles occur in bundles attached to bone to provide movement and are often arranged in antagonistic sets.