The periodontal ligament (PL) is comprised of taut collagen fibre
bundles (called Sharpeys fibres where they are inserted
in cementum and alveolar bone) which are anchored to the cementum
of the tooth and the alveolar bone.
There are three distinct categories of periodontal fibres - gingival,
trans-septal and alveolodental.
There are blood vessels within the periodontal
ligament which are evenly distributed. There
are also nerves that are capable of transmitting
heat, cold, pain and pressure in addition to
proprioception in some species.