Basion

(anatomy) In craniometry, the point on the anterior margin of the foramen magnum where the midsagittal plane of the skull intersects the plane of the foramen magnum.

The midpoint of the anterior (ventral) border of the foramen magnum.

Basion
Occipital bone at birth. (Basion visible but not labeled.)
Gray's	subject #46 181

The basion is part of the human body's musculoskeletal system and is located on the skull. Anatomically it can be identified as the mid-point on the anterior margin of the foramen magnum on the occipital bone.

See also

• opisthion

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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 As such, some of the information contained herein may be outdated.

v • d • e Bones of head and neck: the cranium of the skull (TA A02.1.01-07, GA 2.129-155) Occipital Squama external (Inion/External occipital protuberance, Nuchal lines) · planes (Occipital, Nuchal) · internal (Cruciform eminence, Internal occipital protuberance, Sagittal sulcus, Internal occipital crest) Lateral parts Condyle (Condyloid fossa, Condylar canal) · Hypoglossal canal · jugular (Jugular process, Jugular tubercle) Basilar part Pharyngeal tubercle Other Foramen magnum (Basion, Opisthion) Parietal Parietal eminence · Temporal line · Parietal foramen Frontal Squama Frontal suture · Frontal eminence · external (Superciliary arches, Glabella) · foramina (Supraorbital, Cecum) · Zygomatic process · internal (Sagittal sulcus, Frontal crest) Orbital part Ethmoidal notch · Lacrimal fossa · Trochlear fovea · Frontal sinus · Frontonasal duct Temporal Squama Articular tubercle · Suprameatal triangle · Mandibular fossa · Petrotympanic fissure · Zygomatic process Mastoid part Mastoid foramen · Mastoid process (Mastoid cells) · Mastoid notch · Occipital groove · Sigmoid sulcus · Mastoid antrum (Entrance) Petrous part Carotid canal · Facial canal (Hiatus) · Internal auditory meatus · Aqueduct of cochlea · Stylomastoid foramen fossae (Subarcuate fossa, Jugular fossa) · canaliculi (Inferior tympanic, Mastoid) · Styloid process · Petrosquamous suture (note: ossicles in petrous part, but not part of temporal bone) Tympanic part Suprameatal spine Sphenoid Surfaces Superior surface: Sella turcica (Dorsum sellae, Tuberculum sellae, Hypophysial fossa, Posterior clinoid processes) · Ethmoidal spine · Chiasmatic groove · Middle clinoid process · Petrosal process · Clivus Lateral surface: Carotid groove · Sphenoidal lingula Anterior surface: Sphenoidal sinuses Great wings foramina (Rotundum, Ovale, Vesalii, Spinosum) · Spine · Infratemporal crest · Sulcus for auditory tube Small wings Superior orbital fissure · Anterior clinoid process · Optic canal Pterygoid processes fossae (Pterygoid, Scaphoid) · pterygoid plates (Lateral, Medial) · Pterygoid canal · Hamulus Other Body · Sphenoidal conchae Ethmoid Plates Cribriform plate (Crista galli, Olfactory foramina) · Perpendicular plate Surfaces Lateral surface Orbital lamina · Uncinate process Medial surface Superior nasal concha · Superior meatus · Middle nasal concha · Middle meatus Labyrinth Ethmoid sinus · ethmoidal foramina (Posterior, Anterior)

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