Nurocranium 1-2 Flashcards
Cranial bones
Neurocranium • Frontal bone(1) • Parietal bones(2) • Occipital bone(1) • Tenporal bones(2) • Ethmoid bone(1) • Sphenoid bone(1) Visserocranium • Maxilla(2) • Mandible (1) • Vomer (1) • Palatin bones(2) • Lacrimal bones (2) • Nasal bones(2) • Inferior nasal conchae(2)
FRONTAL BONE
(OS FRONTALE) forms
the majority of forehead
roof of the orbit
floor of the ant. cranial fossa
Parts of frontal bone
- Squamous part
- Orbital part
- Nasal part
OS FRONTALE articulates with
Parietal Zygomatic Greater wing of sphenoid bone Maxilla Ethmoid Lacrimal Nasal
Suture that connects frontal bones Frontal bones and parietal bones Parietal bones Occipital bone and parietal bones
Metopic suture
Coronal suture
Saggital suture
Lamboidal suture
Ant fontanelle and post fontanelle
Between the parietal and frontal bones
Between the parietal and occipital bones
Physiologic closure time of the metopic suture is
over 6 years
External surface of Squamous part
•Frontal eminence (tuber)
•Superciliary arch
•Glabella
•Supraorbital margin
Supraorbital notch/foramen Frontal notch/foramen
•Zygomatic process/ temporal line & surface/ parietal margin
Internal surface of Squamous part
- Groove for superior sagittal sinus
- Frontal crest
- Foramen caecum
- cerebral ridges/ impressions of gyri
Orbital part Forms
the roof of the orbit
Parts of Orbital part
• Orbital surface -Fossa for lacrimal gland (lacrimal fossa) -Trochlear spine and fovea • Ethmoidal notch • Sphenoidal margin • Opening of frontal sinus
Nasal part Articulates with
nasal bones and
frontal process of the maxilla
Nasal part forms
root of the nose
Parts of Nasal part
Nasal spine
Nasion
Nasal margin
When ant fontanelle closes it forms
When post fontanelle closes it forms
Bregma
Lambda
Ethmoidal bone
The main bone forming the bony skeleton of the nasal cavity
Ethmoidal bone Parts:
• Cribriform plate • Crista galli • Perpendicular plate • Ethmoidal labyrinth ➢ Anterior cells of ethmoid bone ➢ Middle cells of ethmoid bone ➢ Posterior cells of ethmoid bone • Orbital plate • Superior nasal concha • Middle nasal concha • Ethmoidal bulla • Uncinate process • Semilunar hiatus
Sphenoid bone Parts:
1) Body
2) Greater wing
3) Lesser wing
4) Pterygoid process
Body of sphenoid
- Jugum sphenoidale
- Sella turcica
- Sulcus caroticus (Carotid sulcus)
- Sulcus prechiasmaticus (Chiasmatic sulcus)
- Carotid sulcus
Posterior surface of sphenoid body is connected to
Inferior…………
connected to the basilary part of the occipital bone
connected to vomer
Anterior surface of sphenoid body is facing to
the nasal cavity (aperture of sphenoidal sinus)
Superior surface of ethmoid body has
sella turcica
Lateral surfaces is the origin of
greater wings and the position of carotic grooves
Sella turcica:
Tuberculum sellae - middle clinoid process Hypophyseal fossa Dorsum sellae - posterior clinoid process
Lesser wing
- Posterior clinoid process
- Sphenoidal rostrum
- Sphenoidal crest
- Sinus of sphenoidal
- Optic canal
- Superior orbital fissure
Superior orbital fissure definition and parts
Fissure between lesser wing and greater wing
▪ Oculomotor n. ▪ Trochlar n. ▪ Abducens n. ▪ Opthalmic n. ▪ Superior apthalmic v.
Holes on greater wing
➢ Foramen rotundum ( maxillary n.V2)
➢ Foramen ovale ( Mandibular n.V3)
➢ Foramen spinosum ( middle meningeal a. and meningeal branches of mandibular n.)
Surfaces of greater wing
➢ Cerebral surface ➢ Temporal surface ➢ Infratemporal surface ➢ Maxillary surface ➢ Orbital surface (anteriorly)
Margins of greater wings
➢ Zygomatic margin
➢ Frontal margin
➢ Parietal margin
➢ Squamosal margin
Crest and spine in sphenoid
- Infratemporal crest
* Spine of sphenoid
Pterygoid process
➢ Lateral pterygoid plate
➢ Medial pterygoid plate
Medial pterygoid plate
▪ Pterygoid notch ▪ Pterygoid fossa ▪ Scaphoid fossa ▪ Pterygoid hamulus ▪ Pterygoid canal
Post margin of sphenoid is ….
Ant margin of sphenoid articulate wiyh
Free
Frontal and ethmoid bone
