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The ligament of apex dentis (or apical odontoid ligament) is a 
It is regarded as a rudimentary intervertebral fibrocartilage, and in it traces of the
ligament
A ligament is a type of fibrous connective tissue in the body that connects bones to other bones. It also connects flight feathers to bones, in dinosaurs and birds. All 30,000 species of amniotes (land animals with internal bones) have liga ...
that spans between the second
The second (symbol: s) is a unit of time derived from the division of the day first into 24 hours, then to 60 minutes, and finally to 60 seconds each (24 × 60 × 60 = 86400). The current and formal definition in the International System of U ...
cervical vertebra
In tetrapods, cervical vertebrae (: vertebra) are the vertebrae of the neck, immediately below the skull. Truncal vertebrae (divided into thoracic and lumbar vertebrae in mammals) lie caudal (toward the tail) of cervical vertebrae. In sauropsid s ...
in the neck
The neck is the part of the body in many vertebrates that connects the head to the torso. It supports the weight of the head and protects the nerves that transmit sensory and motor information between the brain and the rest of the body. Addition ...
and the skull
The skull, or cranium, is typically a bony enclosure around the brain of a vertebrate. In some fish, and amphibians, the skull is of cartilage. The skull is at the head end of the vertebrate.
In the human, the skull comprises two prominent ...
.
It lies as a fibrous cord in the triangular interval between the alar ligament
In anatomy, the alar ligaments are ligaments which connect the dens (a bony protrusion on the second cervical vertebra) to tubercles on the medial side of the occipital condyle.
They are short, tough, fibrous cords that attach on the skull and ...
s, which extends from the tip of the odontoid process
In anatomy, the axis (from Latin ''axis'', "axle") is the second cervical vertebra (C2) of the spine, immediately inferior to the atlas, upon which the head rests. The spinal cord passes through the axis.
The defining feature of the axis is its ...
on the axis
An axis (: axes) may refer to:
Mathematics
*A specific line (often a directed line) that plays an important role in some contexts. In particular:
** Coordinate axis of a coordinate system
*** ''x''-axis, ''y''-axis, ''z''-axis, common names ...
to the anterior margin of the foramen magnum
The foramen magnum () is a large, oval-shaped opening in the occipital bone of the skull. It is one of the several oval or circular openings (foramina) in the base of the skull. The spinal cord, an extension of the medulla oblongata, passes thro ...
, being intimately blended with the deep portion of the anterior atlantooccipital membrane
The anterior atlantooccipital membrane (anterior atlantooccipital ligament) is a broad, dense membrane extending between the anterior margin of the foramen magnum (superiorly), and (the superior margin of) the anterior arch of atlas (inferiorly).
...
and superior crus Crus can refer to:
*''Crus'', a subgenus of the fly genus ''Metopochetus''
*Crus (lower leg)
*Crus, a plural of Cru (wine)
*CRUs, an abbreviation of Civil Resettlement Units
* Rektorenkonferenz der Schweizer Universitäten (CRUS; English: Rectors ...
of the transverse ligament of the atlas.
It is regarded as a rudimentary intervertebral fibrocartilage, and in it traces of the notochord
The notochord is an elastic, rod-like structure found in chordates. In vertebrates the notochord is an embryonic structure that disintegrates, as the vertebrae develop, to become the nucleus pulposus in the intervertebral discs of the verteb ...
may persist.
References
External links
* Ligaments of the head and neck Bones of the vertebral column {{ligament-stub