ClipArt ETC
"Longitudinal and Vertical section of the skull of a dog, with mandible and hyoid arch. an, anterior narial aperture; MT, maxillo-turbinal bone; ET, the ethmo-turbinal; Fr, frontal; Pa, pariental; IP, interparietal; SO, supra-occipital; ExO, sphenoid; OS, orbito-sphenoid; PS, presphenoid; Pl, palatine; Vo, vomer; Mx, maxilla; PMx, premaxilla; sh, stylo-hyal; eh, epi-hyal; ch, cerato-hyal; bh, basihyal; th, thyro-hyal; s, symphysis of mandible; cp, coronoid process; cd, condyle; a, angle; id, inferior dental canal. The mandible is displaced downwards, to show its entire form; the * indicated the part of the cranium to which the condyle is articulated." —The Encyclopedia Britannica, 1903

Dog Skull

"Longitudinal and Vertical section of the skull of a dog, with mandible and hyoid arch. an, anterior…

The head is the part of the body that contains the brain and the organs of the special senses.

Head

The head is the part of the body that contains the brain and the organs of the special senses.

The base of the skull. The lower jaw has been removed. At the lower part of the figure is the hard palate forming the roof of the mouth and surrounded by the upper set of teeth

Base of the Skull

The base of the skull. The lower jaw has been removed. At the lower part of the figure is the hard palate…

A side view of the skull. Labels: O, occipital bone; T, temporal; Pr, parietal; F, frontal; S, sphenoid; Z, malar; Mx, maxilla; N, nasal; E, ethmoid; L, lachrymal; Md, inferior maxilla.

Side View of the Skull

A side view of the skull. Labels: O, occipital bone; T, temporal; Pr, parietal; F, frontal; S, sphenoid;…

"It consists of four isoceles triangular faces which intersect all three of the crystallographic axes, the intercepts on the two horizontal axes being equal. The faces correspond in their position to the alternating faces of the tetragonal pyramid of the first order." — Ford, 1912

Sphenoid

"It consists of four isoceles triangular faces which intersect all three of the crystallographic axes,…

"It consists of four isoceles triangular faces which intersect all three of the crystallographic axes, the intercepts on the two horizontal axes being equal. The faces correspond in their position to the alternating faces of the tetragonal pyramid of the first order." — Ford, 1912

Sphenoid

"It consists of four isoceles triangular faces which intersect all three of the crystallographic axes,…

A bone situated at the base of the skull in front of the temporals and basilar part of the occipital.

Sphenoid Bone

A bone situated at the base of the skull in front of the temporals and basilar part of the occipital.

A bone situated at the base of the skull in front of the temporals and basilar part of the occipital.

Sphenoid Bone

A bone situated at the base of the skull in front of the temporals and basilar part of the occipital.

A bone situated at the base of the skull in front of the temporals and basilar part of the occipital.

Sphenoid Bone

A bone situated at the base of the skull in front of the temporals and basilar part of the occipital.

The sphenoid bone of the skull, seen from in the front.

Sphenoid Bone

The sphenoid bone of the skull, seen from in the front.

The sphenoid bone of the skull, posterior surface.

The Sphenoid Bone

The sphenoid bone of the skull, posterior surface.

The sphenoid bone of the skull, anterior surface.

The Sphenoid Bone

The sphenoid bone of the skull, anterior surface.

The sphenoid bone, viewed from above.

Sphenoid Bone

The sphenoid bone, viewed from above.

Sphenoid bone, viewed from in front.

Sphenoid Bone

Sphenoid bone, viewed from in front.

Sphenoid bone at about birth, seen from before.

Sphenoid Bone at Birth from Before

Sphenoid bone at about birth, seen from before.

Sphenoid bone at about birth, seen from behind.

Sphenoid Bone at Birth from Behind

Sphenoid bone at about birth, seen from behind.

The sphenoid bone from above.

Sphenoid Bone from Above

The sphenoid bone from above.

The sphenoid bone from before.

Sphenoid Bone from Before

The sphenoid bone from before.

The sphenoid bone from behind.

Sphenoid Bone from Behind

The sphenoid bone from behind.

Sphenoid bone, situated the anterior part of the base of the skull, articulating with all the other cranial bones, which it binds firmly and solidly together. Labels: a, greater wing; b, lesser wing.

Sphenoid Bone of the Human Skull

Sphenoid bone, situated the anterior part of the base of the skull, articulating with all the other…

Portion of sphenoid bone, showing the foramen pterygospinosum.

Sphenoid Bone Showing Foramen Pterygospinosum

Portion of sphenoid bone, showing the foramen pterygospinosum.

Sphenoid bone, showing abnormal development of middle clinoid processes, especially on the left side.

Abnormal Sphenoid Bone

Sphenoid bone, showing abnormal development of middle clinoid processes, especially on the left side.

The sphenoid as seen from behind.

Sphenoid Viewed from Behind

The sphenoid as seen from behind.

The sphenoid as seen from the front.

Sphenoid Viewed from the Front

The sphenoid as seen from the front.

"It consists of four isoceles triangular faces which intersect all three of the crystallographic axes, the intercepts on the two horizontal axes being equal. The faces correspond in their position to the alternating faces of the tetragonal pyramid of the first order. There maybe different sphenoids, depending upon their varying intersections with the vertical axes. There may also be a positive and a negative sphenoid, the combination of the two being represented." — Ford, 1912

Sphenoid, positive and negative

"It consists of four isoceles triangular faces which intersect all three of the crystallographic axes,…

"The Sphenoidal Class corresponds in the Tetragonal system to the Tetrahedral class in the Isometric System. It is characterized by the following symmetry: The three crystallographic axes are axes of binary symmetry, and there are two vertical diagonal planes of symmetry." — Ford, 1912

Symmetry of Sphenoidal class

"The Sphenoidal Class corresponds in the Tetragonal system to the Tetrahedral class in the Isometric…