Helictites are, perhaps, the most delicate of cave formations. They are usually made of needle-form calcite and aragonite. Forms of helictites have been described in several types: ribbon helictites, saws, rods, butterflies, hands, curly-fries, and clumps of worms.. They typically have radial symmetry.
The temporomandibular joint (TMJ) is the joint where the mandible articulates with the cranium (Fig 8.1). The following characteristics make the TMJ a complex and unique joint: 1  It is classified as a compound joint even though it does not include three bone structures in the articulation.
Copyright Â© 2006 Pearson Education, Inc., publishing as Benjamin Cummings Maxillary Bones: Major Markings Incisive fossa (midline foramen) Posterior to teeth Passage for blood vessels/nerves Maxillary sinuses Largest of the paranasal sinuses Extend from the orbits to the roots of the upper teeth.