Greater wing of sphenoid
The greater wing or ali-sphenoid of the sphenoid bone is a process which projects from either side of the lower part of the sphenoid body, at a common junction with the pterygoid process 1. It is a paired structure, which curves upward, backward and laterally from each side of the sphenoid body, which can be likened to the extended wings of a bat 2. Both wings also have a triangular process projecting inferiorly which is known as the spine of the sphenoid bone.
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Gross Anatomy
The greater wing of the sphenoid features superior, lateral and orbital surfaces.
The superior surface features:
- foramen rotundum: transmits the maxillary branch of the trigeminal nerve
- foramen ovale: transmits the mandibular division of the trigeminal nerve, accessory meningeal artery and (occasionally) the lesser petrosal nerve
- foramen spinosum: transmits the middle meningeal artery and meningeal branch of the mandibular nerve
- foramen Vesalii: variable presence, transmits small vein of cavernous sinus
The lateral surface features:
-
infratemporal crest: a transverse ridge dividing the lateral surface in two parts
- temporal: forms part of the temporal fossa and provides attachment for the temporalis
- infratemporal: forms part of the infratemporal fossa and provides attachment for the lateral pterygoid
- spina angularis: serves as attachment for sphenomandibular ligament and the tensor veli palatini. Grooved by the chorda tympani, medially, and the auriculotemporal nerve, laterally
The orbital surface features:
- inferior margin: forms postero-lateral boundary of the inferior orbital fissure
- medial margin: forms lower boundary of the superior orbital fissure
- a tubercle at its centers serves as an attachment to the inferior head of the lateral rectus muscle
- upper part of the margin is notched by the transmission of a recurrent branch of the lacrimal artery
- lateral margin: articulates with the zygomatic bone, inferiorly, and frontal bone, superiorly
Articulations
The lateral margin of the posterior border of greater wing articulates with the anterior border of petrous temporal bone.
The posterior most part of the greater wing projects as a triangular process, sitting within the angle of the junction between the squamous and petrous portions of the temporal bone.
The tip of the great wing articulates with the parietal bone at the pterion.
Variant anatomy
- sphenoidal emissary foramen (occasionally present) it is a small aperture medial to the foramen ovale, opposite the root of the pterygoid process; it opens below near the scaphoid fossa and transmits a small vein from the cavernous sinus
- foramen petrosum (occasionally present), a small opening between the foramen spinosum and foramen ovale, for transmission of the lesser petrosal nerve
- common variant of foramen spinosum where the meningeal artery passes through foramen ovale instead of foramen spinosum
Osseous development
The greater wings of the sphenoid are the only bony structures of the skull which undergo both intramembranous and endochondral ossification.
Related pathology
Traumatic injury
- injuries most commonly associated with fractures of the sphenoid are orbital fractures and mid-face fractures which usually occur following high energy trauma 3
- fractures of the greater wing of the sphenoid are relatively uncommon and mostly associated with lateral orbital wall fractures along the broad spheno-zygomatic suture 4
Surgical relevance
- lateral orbital decompression surgery for exophthalmos 5
- lateral orbital wall fracture repair 4
- emergent surgical relief of optic nerve compression 6
Related Radiopaedia articles
Anatomy: Head and neck
- skeleton of the head and neck
-
cranial vault
- scalp (mnemonic)
- fontanelle
-
sutures
- calvarial
- facial
- frontozygomatic suture
- frontomaxillary suture
- frontolacrimal suture
- frontonasal suture
- temporozygomatic suture
- zygomaticomaxillary suture
- parietotemporal suture (parietomastoid suture)
- occipitotemporal suture (occipitomastoid suture)
- sphenofrontal suture
- sphenozygomatic suture
- spheno-occipital suture (not a true suture)
- lacrimomaxillary suture
- nasomaxillary suture
- internasal suture
- basal/internal
- skull landmarks
- frontal bone
- temporal bone
- parietal bone
- occipital bone
- skull base (foramina)
-
facial bones
- midline single bones
- paired bilateral bones
- cervical spine
- hyoid bone
- laryngeal cartilages
-
cranial vault
- muscles of the head and neck
- muscles of the tongue (mnemonic)
- muscles of mastication
-
muscles of facial expression
- occipitalis muscle
- circumorbital and palpebral muscles
- nasal muscles
- buccolabial muscles
- elevators, retractors and evertors of the upper lip
- levator labii superioris alaeque nasalis muscle
- levator labii superioris muscle
- zygomaticus major muscle
- zygomaticus minor muscle
- malaris muscle
- levator anguli oris muscle
- risorius muscle
- depressors, retractors and evertors of the lower lip
- depressor labii inferioris muscle
- depressor anguli oris muscle
- mentalis muscle
- compound sphincter
- orbicularis oris muscle
- incisivus superior muscle
- incisivus inferior muscle
- muscle of mastication:
- elevators, retractors and evertors of the upper lip
- muscles of the middle ear
- orbital muscles
- muscles of the soft palate
- pharyngeal muscles
- suprahyoid muscles
- infrahyoid muscles
- intrinsic muscles of the larynx
- muscles of the neck
- accessory muscles of the neck
- deep cervical fascia
-
deep spaces of the neck
- anterior cervical space
- buccal space
- carotid space
- danger space
- deep cervical fascia
- infratemporal fossa
- masticator space
- parapharyngeal space
- stylomandibular tunnel
- parotid space
- pharyngeal (superficial) mucosal space
- perivertebral space
- posterior cervical space
- pterygopalatine fossa
- retropharyngeal space
- suprasternal space (of Burns)
- visceral space
- surgical triangles of the neck
- orbit
- ear
- paranasal sinuses
- nose
- oral cavity
- pharynx
- larynx
- viscera of the neck
- blood supply of the head and neck
-
arterial supply
-
common carotid artery
- carotid body
- carotid bifurcation
- subclavian artery
- variants
-
common carotid artery
- venous drainage
-
arterial supply
- innervation of the head and neck
-
cranial nerves
- olfactory nerve (CN I)
- optic nerve (CN II)
- oculomotor nerve (CN III)
- trochlear nerve (CN IV)
-
trigeminal nerve (CN V) (mnemonic)
- trigeminal ganglion
- ophthalmic division
- maxillary division
- mandibular division
- abducens nerve (CN VI)
- facial nerve (CN VII)
-
vestibulocochlear nerve (CN VIII)
- vestibular ganglion (Scarpa's ganglion)
- glossopharyngeal nerve (CN IX)
-
vagus nerve (CN X)
- superior laryngeal nerve
- recurrent laryngeal nerve (inferior laryngeal nerve)
- (spinal) accessory nerve (CN XI)
- hypoglossal nerve (CN XII)
- parasympathetic ganglia of the head and neck
- greater occipital nerve
- third occipital nerve
-
cervical plexus
- muscular branches
- longus capitis
- longus colli
- scalenes
- geniohyoid
- thyrohyoid
-
ansa cervicalis
- omohyoid (superior and inferior bellies separately)
- sternothyroid
- sternohyoid
- phrenic nerve
- contribution to the accessory nerve (CN XI)
- cutaneous branches
- muscular branches
- brachial plexus
- pharyngeal plexus
-
cranial nerves
- lymphatic drainage of the head and neck
- embryological development of the head and neck