posterior atlanto-occipital membrane

pos·te·ri·or at·lan·to-oc·cip·i·tal mem·brane

the fibrous membrane that attaches between the posterior arch of the atlas and the posterior margin of the foramen magnum.
Farlex Partner Medical Dictionary © Farlex 2012
References in periodicals archive ?
The posterior supporting ligaments are comprised of the posterior atlanto-occipital membrane and atlantoaxial ligament.
While a group of authors stated that such anatomical variations could be due to the ossification of the posterior atlanto-occipital membrane or acquired ossification of the oblique ligament (lateral border of the posterior atlanto-occipital membrane which forms the aperture for the vertebral artery and the suboccipital nerve) as a consequence of the vertebral artery pulsation [3, 9], others claimed that the PP might be related to erect posture and bipedalism [14, 17].
The vertebral artery on both sides passes through the foramina transversaria of the first six cervical vertebrae, penetrate the posterior atlanto-occipital membrane and enter the cranial cavity through the foramen magnum.
This was attributed to an anomalous ossification center in the oblique ligament of atlas, which is actually the lower border of the lateral division of the posterior atlanto-occipital membrane that bridges the sulcus and converts it into a foramen for the vertebral artery.
Accompanying anomalies include an enlarged anterior arch, cephalad elongation of the spinous process of the axis, and a dense fibrous membrane forming a posterior atlanto-occipital membrane [2].
After the vertebral arteries emerge from the cervical foramina, they run along the grooves in the superior aspects of the posterior arch of the atlas and then through the posterior atlanto-occipital membrane before entering the dura (Figure).
Also a soft tissue connection has been described of this muscle and the posterior atlanto-occipital membrane, visualized in three distinct fiber-tipes: tendon-like, muscle-like and fascia-like bridges (Zumpano et al, 2006).
Davies F2 also explained that behind the groove, on each side, the upper border of the posterior arch gives attachment to the posterior atlanto-occipital membrane; its lower border gives attachment to the highest pair of ligament flava.
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