Extemporaneous :: Extemporaneous (a.) Composed, performed, or uttered on the spur of the moment, or without previous study; unpremeditated; off-hand; extempore; extemporary; as, an extemporaneous address or production..
Extemporary :: Extemporary (a.) Made for the occasion; for the time being.
Infratemporal :: Infratemporal (a.) Below the temple; below the temporal bone.
Post-temporal :: Post-temporal (a.) Situated back of the temporal bone or the temporal region of the skull; -- applied especially to a bone which usually connects the supraclavicle with the skull in the pectoral arch of fishes.