The****** tectorial membrane of atlanto-axial joint (occipitoaxial ligaments) is a tough membrane/ broad, strong band ************ representing the superior-ward prolongation of the posterior longitudinal ligament (the two being continuous). ****** It**** attaches inferiorly onto (the posterior aspect of ) the body of axis. ******** It broadens superiorly. Superiorly, the membrane extends deep to the median atlanto-axial joint and its associated ligaments, then through the foramen magnum into the cranial cavity ******** where it ends by attaching onto the basilar part of occipital bone superior to the foramen magnum. ****

Anatomy

The** membrane broadens superiorly. **

Structure

The** membrane consists of two laminae - superficial and deep. ** The** superficial lamina broadens superiorly before attaching onto the superior/internal surface of the basilar part of occipital bone superior to the foramen magnum, here blending with the cranial dura mater. ** The** deep lamina consists of a strong medial band which extends superiorly to the foramen magnum, and of two lateral bands which superiorly reach and blend with the articular capsules of the atlanto-occipital joint. **

Relations

The** membrane situated is posterior/deep to the transverse ligament of the atlas; the two are separated by a thin intervening layer of loose areolar connective tissue, and sometimes by a bursa. ** The** membrane is situated anterior/superficially to the spinal dura mater (which is firmly attached to the tectorial membrane). **