Odishan temples evolved as a regional variation of the Nagara architecture. One of the first temples is the Parasuramesvara temple at Bhubaneshwar.
Pic courtesy: http://indiamike.com 
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Earlier temples didn't have the mukha-mandapa or the jagamohana. And later temples additionally had the natamandapa and the bhogamanadapa. Parasuramesvara temple sit at the cross-roads of temple evolution in Odisha.
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Unlike other temples of Nagara style, the sanctum with the tower is known as rekha deul (vs vimana) and the jagamohana is known as bhadra/pidha deul.
The sanctum's vertical axis is divided into pishta (pedestal), bada (sanctum cella), gandi/sikhara (tower) and mastaka (crown)
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The mastaka or crowning elements are divided into beki/kantha (the neck), amla/amalaka-sila (the flattened spheroid with ribbed edges), khapuri (flat covering of amla, kalasa (water jar) and dhvaja/ayudha (emblem of the deity) - here it's dedicated to Shiva.
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