Sphenoid bone


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Sphenoid bone ex situ Sphenoid bone in situ

Sphenoid bone ex situ & in situ. This bone is situated in the center of the base of skull and has direct contact with almost all other bones of the skull (except of nasal, lacrimal bone and mandible). It acts like the cornerstone transmitting and distributing the stress forces applyied to the skull.

To better depict the position of this bone the picture above shows skull with right zygomatic bone removed.


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Front view of sphenoid bone Markup for front view of sphenoid bone
Ventral aspect of sphenoid bone. Sphenoid bone is composed by central part — corpus, two pairs of major and lesser wings — ala major et minor and the pair of pterygoid processes.
The list of terms: Ala minor – Lesser wing of sphenoid
Ala major – Greater wing of sphenoid
Processus pterygoideus – Pterygoid process of the sphenoid
Corpus – Body of sphenoid bone

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Top view of sphenoid bone Markup for the top view of sphenoid bone
Top view of sphenoid bone demonstrating the sella turcica — the shaddle-shaped depression on top of the corpus ossis sphenoidalis that surrounds the pituitary gland.
The list of terms: Facies cerebralis alae minoris – Cerebral surface of lesser wing
Facies cerebralis alae majoris – Cerebral surface of greater wing
Jugum sphenoidale
Sella turcica – Turkish saddle
Dorsum sellae
Tuberculum sellae
Fossa hypophysialis – Hypophysial fossa
Sulcus prechiasmaticus – Prechiasmatic groove
Processus clinoideus anterior – Anterior clinoid process

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Back view of sphenoid bone Markup for back view of sphenoid bone
Dorsal aspect of sphenoid demonstrating multiple openings and channels within that bone. Canalis opticus and fissura orbitalis superior connects fossa cranii media with the orbit, but foramen rotundum and canalis pterygoides are the pahtways to the fossa pterygopalatina.
The list of terms: Canalis opticus – Optic canal
Fissura orbitalis superior – Superior orbital fissure
Foramen rotundum – Round opening
Canalis pterygoideus – Pterygoid (vidian) canal
Impressiones digitatae – Digitate impressions
Juga cerebralia – Cerebral ridges of cranium
Processus pterygoideus – Pterygoid process
Lamina lateralis processus pterygoidei – Lateral pterygoid plate
Lamina medialis processus pterygoidei – Medial pterygoid plate
Spina ossis phenoidalis – Angular spine of sphenoid

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Oblique frontal view of sphenoid bone Markup for the oblique frontal view of sphenoid bone
Oblique frontal view of sphenoid. Note the multiple different faces (facies) on the surface of wings reflecting complex topographical position of this bone situated at the very middle of the skull.
The list of terms: Facies orbitalis alae majoris – Orbital surface of greater wing
Facies temporalis alae majoris – Temporal surface of greater wing
Facies maxillaris – Maxillary surface
Facies infratemporalis – Infratemporal surface
Facies orbitalis alae minoris – Orbital surface of lesser wing
Margo zygomaticus – Zygomatic border
Margo frontalis – Frontal border
Margo parietalis – Parietal border
Margo squamosus – Squamous border
Crista infratemporalis – Infratemporal crest
Concha sphenoidalis – Sphenoidal concha
Apertura sinus sphenoidalis – Aperture of sphenoidal sinus
Sinus sphenoidalis – Sphenoidal sinus
Crista sphenoidalis – Sphenoidal crest
Rostrum sphenoidale – Sphenoidal rostrum

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Oblique dorsal view of sphenoid bone Markup for the oblique dorsal view of sphenoid bone
Dorsal oblique view demonstrating the sulcus caroticus — the groove made by internal carotid artery located along the lateral wall of the corpus.
The list of terms: Dorsum sellae
Processus clinoideus posterior – Posterior clinoid process
Processus clinoideus anterior – Anterior clinoid process
Sulcus prechiasmaticus – Prechiasmatic groove
Canalis opticus – Optica canal
Sulcus caroticus – Carotid groove
Lingula sphenoidalis
Sulcus tubae ouditoriae – Groove for the cartilaginous part of the auditory tube
Spina ossis sphenoidalis – Angular spine of sphenoid
Fossa scaphoidea – Scaphoid fossa
Incisura pterygoidea – Pterigoid notch
Hamulus pterygoideus – Pterygoid hamulus
Fossa scaphoidea – Scaphoid fossa
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Inferior view of sphenoid bone Markup for the inferior view of sphenoid bone
Inferior aspect of sphenoid.
The list of terms: Processus pterygoideus – Pterygoid process
Hamulus pterygoideus – Pterygoid hamulus
Sulcus hamuli pterygoidei – Sulcus of pterygoid hamulus
Processus pterygospinosus – Pterygospinous process
Foramen ovale
Foramen spinosum
Fossa scaphoidea – Scaphoid fossa
Processus vaginalis – Vaginal process
Sulcus vomerovaginalis – Vomerovaginal groove
Sulcus palatovaginalis – Palatovaginal groove
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The topography of sphenoid bone. 360° rotation.