Like the other cranial bones, it is classed as aflat bone. Due to its many attachments and features, the occipital bone is described in terms of separate parts. From its front to the back is thebasilar part, also called the basioccipital, at the sides of the foramen magnum are thelateral parts, also called the exoccipitals, and the back is named as thesquamous part. The basilar part is a thick, somewhat quadrilateral piece in front of the foramen magnum and directed towards thepharynx. The squamous part is the curved, expanded plate behind the foramen magnum and is the largest part of the occipital bone.
Due to its embryonic derivation from paraxial mesoderm (as opposed to neural crest, from which many other craniofacial bones are derived), it has been posited that "the occipital bone as a whole could be considered as a giant vertebra enlarged to support the brain."[1]
Near the middle of the outer surface of the squamous part of the occipital (the largest part) there is a prominence – theexternal occipital protuberance. The highest point of this is called theinion.
From the inion, along the midline of the squamous part until the foramen magnum, runs a ridge – theexternal occipital crest (also called the medial nuchal line) and this gives attachment to thenuchal ligament.
Running across the outside of the occipital bone are three curved lines and one line (the medial line) that runs down to the foramen magnum. These are known as thenuchal lines which give attachment to various ligaments and muscles. They are named as thehighest,superior andinferior nuchal lines. The inferior nuchal line runs across the midpoint of themedian nuchal line. The area above the highest nuchal line is termed theoccipital plane and the area below this line is termed thenuchal plane.
The inner surface of the occipital bone forms the base of theposterior cranial fossa. Theforamen magnum is a large hole situated in the middle, with theclivus, a smooth part of the occipital bone travelling upwards in front of it. The median internal occipital crest travels behind it to theinternal occipital protuberance, and serves as a point of attachment to thefalx cerebri.
The inner surface of the occipital bone is marked by dividing lines as shallow ridges, that form fourfossae or depressions. The lines are called thecruciform (cross-shaped)eminence.
There are two midlineskull landmarks at theforamen magnum. Thebasion is the most anterior point of the opening and theopisthion is the point on the opposite posterior part. The basion lines up with thedens.
The foramen magnum (Latin:large hole) is a large ovalforamen longest front to back; it is wider behind than in front where it is encroached upon by theoccipital condyles. The clivus, a smooth bony section, travels upwards on the front surface of the foramen, and the median internal occipital crest travels behind it.[3]
Thesuperior angle of the occipital bone articulates with the occipital angles of theparietal bones and, in the fetal skull, corresponds in position with theposterior fontanelle.
Thesuperior borders extend from the superior to the lateral angles: they are deeply serrated for articulation with the occipital borders of the parietals, and form by this union thelambdoidal suture.
Theinferior borders extend from the lateral angles to the inferior angle; the upper half of each articulates with the mastoid portion of the correspondingtemporal, the lower half with thepetrous part of the same bone.
These two portions of the inferior border are separated from one another by thejugular process, the notch on the anterior surface of which forms the posterior part of thejugular foramen.
Theoccipital plane [Fig. 3] of the squamous part of the occipital bone is developed inmembrane, and may remain separate throughout life when it constitutes theinterparietal bone; the rest of the bone is developed in cartilage.
The number of nuclei for the occipital plane is usually given as four, two appearing near the middle line about the second month, and two some little distance from the middle line about the third month offetal life.
Thenuchal plane of the squamous part is ossified from two centers, which appear about the seventh week of fetal life and soon unite to form a single piece.
Union of the upper and lower portions of the squamous part takes place in the third month of fetal life.
An occasional centre (Kerckring) appears in the posterior margin of the foramen magnum during the fifth month; this forms a separate ossicle (sometimes double) which unites with the rest of the squamous part before birth.
Each of the lateral parts begins toossify from a single center during the eighth week of fetal life. Thebasilar portion is ossified from two centers, one in front of the other; these appear about the sixth week of fetal life and rapidly coalesce.
The occipital plane is said to be ossified from two centers and the basilar portion from one.
About the fourth year the squamous part and the two lateral parts unite, and by about the sixth year the bone consists of a single piece. Between the 18th and 25th years the occipital andsphenoid bone become united, forming a single bone.
Trauma to the occiput can cause a fracture of the base of the skull, called abasilar skull fracture. Thebasion-dens line as seen on aradiograph is the distance between the basion and the top of the dens, used in the diagnosis of dissociation injuries.[4]
Occipital stems from Latinocciput "back of the skull", from ob "against, behind" + caput "head". Distinguished fromsinciput (anterior part of the skull).[5]
In many animals these parts stay separate throughout life; for example, in the dog as four parts:squamous part (supraoccipital);lateral parts–left and right parts (exoccipital);basilar part (basioccipital).
The occipital bone is part of theendocranium, the most basal portion of the skull. InChondrichthyes andAgnatha, the occipital does not form as a separate element, but remains part of thechondrocranium throughout life. In mosthigher vertebrates, the foramen magnum is surrounded by a ring of four bones.
The basioccipital lies in front of the opening, the two exoccipital condyles lie to either side, and the larger supraoccipital lies to the posterior, and forms at least part of the rear of the cranium. In manybony fish andamphibians, the supraoccipital is never ossified, and remains ascartilage throughout life. In primitive forms the basioccipital and exoccipitals somewhat resemble the centrum and neural arches of avertebra, and form in a similar manner in the embryo. Together, these latter bones usually form a single concave circularcondyle for the articulation of the firstvertebra.[6]
Inmammals, however, the condyle has divided in two, a pattern otherwise seen only in a few amphibians.
Most mammals also have a single fused occipital bone, formed from the four separate elements around the foramen magnum, along with the pairedpostparietal bones that form the rear of thecranial roof in other vertebrates.[6]
Susan Standring; Neil R. Borley; et al., eds. (2008).Gray's anatomy: the anatomical basis of clinical practice (40th ed.). London: Churchill Livingstone.ISBN978-0-8089-2371-8.
^abRomer, Alfred Sherwood; Parsons, Thomas S. (1977).The Vertebrate Body. Philadelphia, PA: Holt-Saunders International. pp. 221–244.ISBN0-03-910284-X.
