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| Bone: Chiasmatic groove |
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| Sphenoid bone. Upper surface. (Sulcus chiasmaticus labeled at center) |
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| Base of the skull. Upper surface. (Sphenoid bone is yellow; chiasmatic groove labeled at center left, fourth from the top of the labels near the yellow region.) |
| Latin |
sulcus prechiasmaticus, sulcus chiasmaticus |
| Gray's |
subject #35 147 |
| Dorlands/Elsevier |
s_28/12769648 |
The superior surface of the body of the sphenoid bone is bounded behind by a ridge, which forms the anterior border of a narrow, transverse groove, the chiasmatic groove (optic groove, prechiasmatic sulcus), above and behind which lies the optic chiasma.
The groove ends on either side in the optic foramen, which transmits the optic nerve and ophthalmic artery into the orbital cavity.
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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
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Bones of head and neck: the cranium |
occipital bone: Foramen magnum - Squama occipitalis (Inion - Nuchal lines - Planum occipitale - Planum nuchale - Cruciform eminence - Internal occipital protuberance - Sagittal sulcus - Internal occipital crest)
Lateral parts (Occipital condyle - Hypoglossal canal - Condyloid fossa - Condylar canal - Jugular process - Jugular tubercle) - Basilar part (Pharyngeal tubercle)
parietal bone: Parietal eminence - Temporal line - Parietal foramen
frontal bone: Squama frontalis (Frontal suture - Frontal eminence - Superciliary arches - Glabella - Supraorbital foramen - Zygomatic process - Sagittal sulcus - Frontal crest - Foramen cecum)
Pars orbitalis (Ethmoidal notch - Lacrimal fossa - Trochlear fovea - Posterior ethmoidal foramen - Anterior ethmoidal foramen - Frontal sinus - Frontonasal duct)
temporal bone: Squama temporalis (Articular tubercle - Suprameatal triangle - Mandibular fossa - Petrotympanic fissure) - Mastoid portion (Mastoid foramen
Mastoid process - Mastoid notch - Occipital groove - Sigmoid sulcus - Mastoid antrum)
Petrous portion (Facial canal - Hiatus of the facial canal - Internal auditory meatus - Subarcuate fossa - Carotid canal - Aqueduct of cochlea - Jugular fossa - Inferior tympanic canaliculus - Mastoid canaliculus - Styloid process - Stylomastoid foramen - Petrosquamous suture) - Tympanic part (Suprameatal spine) - Zygomatic process
sphenoid bone: Body Superior surface (Ethmoidal spine, Chiasmatic groove, Optic foramen, Sella turcica, Fossa hypophyseos, Middle clinoid process, Dorsum sellae, Posterior clinoid processes, Petrosal process, Clivus)
Lateral surface (Carotid groove - Sphenoidal lingula) - Anterior surface (Sphenoidal sinuses)
Great wings (Spine, Foramen rotundum, Foramen ovale, Foramen Vesalii, Foramen spinosum, Infratemporal crest, Sulcus tubae auditivae) - Small wings (Superior orbital fissure, Anterior clinoid process, Optic foramen)
Pterygoid processes (Pterygoid fossa, Scaphoid fossa, Lateral pterygoid plate, Medial pterygoid plate, Pterygoid canal, Pterygoid hamulus) - Sphenoidal conchae
ethmoid bone: Cribriform plate (Crista galli) - Perpendicular plate - Labyrinth (Ethmoid sinus) - Lateral surface Lamina papyracea - Uncinate process - Medial surface Middle nasal concha - Superior meatus - Superior nasal concha - Middle meatus
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