32.4 Joints in and around the head
32.4.1 Atlantoaxial Joint
@OpenStaxAnatomy2020 Ch. 9
The atlantoaxial joint is a pivot type of joint between the dens portion of the axis (C2 vertebra) and the anterior arch of the atlas (C1 vertebra), with the dens held in place by a ligament.
(slide credit: @OpenStaxAnatomy2020 Ch. 9)
The uppermost cervical vertebra (the atlas) rotates about the odontoid process of the second cervical vertebra (the axis).23
32.4.2 Temporomandibular Joint
@OpenStaxAnatomy2020 Ch. 9
The temporomandibular joint is the articulation between the temporal bone of the skull and the condyle of the mandible, with an articular disc located between these bones. During depression of the mandible (opening of the mouth), the mandibular condyle moves both forward and hinges downward as it travels from the mandibular fossa onto the articular tubercle.
(slide credit: @OpenStaxAnatomy2020 Ch. 9)