Frog Anatomy: detailed, includes labeled photographs

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Overview of frog anatomy are:
As in other higher vertebrates, the frog body may be divided into a head, a short neck, and a trunk. The flat head contains the brain, mouth, eyes, ears, and nose. The stubby trunk forms walls for a single body cavity, the coelom. All the frog's internal organs--including the heart, the lungs, and all organs of digestion--are held in this single hollow space (coelom).
The Skeleton and Muscles
The skull is flat, except for an expanded area that encases the small brain. Only nine vertebrae make up the frog's backbone, or vertebral column. The frog has no ribs.
The frog does not have a tail. Only a spikelike bone, the urostyle, remains as evidence that primitive frogs probably had tails. The urostyle, or "tail pillar," is a downward extension of the vertebral column.
The frog has one "forearm" bone, the radio-ulna and one "upper arm" bone, the humerus.
The hind legs of the frog are highly specialized for leaping. The single "shinbone" is the tibiofibula and the single upper leg (thigh) bone is the femur. A third division of the frog's leg consists of two elongated anklebones, or tarsals. These are the astragalus and the calcaneus. As in other vertebrates, the frog skeleton is moved by muscles (see Muscles). Skeleton-moving muscles are made of skeletal, or "striated," muscle. Internal organs contain smooth muscle tissue.
The Circulatory System
The frog heart is the only organ contained within the coelom which has its own protective covering. This is the pericardium. ...