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CRANIAL FOSSAE AND ITS RELATED STRUCTURES

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ARCHITECTURE OF THE CRANIUM ARRANGEMENT OF THE CRANIAL FOSSA CORRELETION

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3 Phases


ARCHITECTURE OF CRANIUM

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CA

A V L

A I R

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L ? A I N C O A T F E L E K S

CR AN IU M SK UL

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SKULL

FACIAL CALVARIA CRANIUM SKELETON

MANDIBLE + CRANIUM = SKULL www.indiandentalacademy.com


NUMBER OF BONES . . . 8 BONES FORMS CALVARIA 14 BONES FORMS FACIAL SKELETON

22 www.indiandentalacademy.com


PAIRED PARIETAL TEMPORAL UNPAIRED FRONTAL OCCIPITAL SPHENOID ETHMOID www.indiandentalacademy.com


PAIRED MAXILLA ZYGOMATIC NASAL LACRIMAL PALATINE INFERIOR NASAL CONCHA

UNPAIRED MANDIBLE NORMA FRONTALIS

VOMER www.indiandentalacademy.com


Unions . . . Sagittal suture Coronal suture Lambdoid suture Temporal suture

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ARRANGEMENT OF CRANIAL FOSSA

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AN TE R

D I M

IO R

E L D

PO

ST ER

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IO

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BONES . . . Frontal bone in front Orbital part of frontal bone Cribriform plate of ethmoid Lesser wing of sphenoid Anterior part of body of sphenoid

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DESCRIPTION . . .

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FORAMEN . . .

FORAMEN CAECUM vein from upper part of nose to Superior sagittal sinus

FORAMINA OF CRIBRIFORM PLATE OF ETHMOID miniature olfactory nerves from nasal mucosa to olfactory bulb www.indiandentalacademy.com


RELATED STRUCTURES . . . Falx cerebri – crista galli Tentorium cerebelli – anterior clinoid process Frontal lobe of brain

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BONES . . . Lesser wing spnenoid bone Greater wing of sphenoid bone Anterior clinoid process Petrous part of temporal bone Squamous temporal bone Anteroinferior angle of parietal bone Body of sphenoid bone www.indiandentalacademy.com


DESCRIPTION . . .

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FORAMEN . . . Superior orbital fissure Lateral part Lacrimal nerve Frontal Trochler n. Sup ophthalmic vein Meningeal br. Of lacrimal artery Anastomotic branch of middle meningeal art. www.indiandentalacademy.com


Superior orbital fissure Middle part Upper & lower divisions of oculomotor n. Nasociliary n. Abducent n.

Medial part Inferior ophthalmic vein Symp. Nerves from the plexus around the internal carotid artery www.indiandentalacademy.com


FORAMEN . . . Foramen rotundum Transmits maxillary nerve

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Foramen ovale

mandibular nerve lesser petrosal nerve acc.meningeal artery emissary vein connecting cavernous sinus with pterygoid plexus of veins ant. Trunk of middle meningeal vein www.indiandentalacademy.com


Foramen spinosum Middle meningeal artery Meningeal branch of mandibular nerve Post. Trunk of middle meningeal vein

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Emissary sphenoidal foramen emissary vein conn. Cavernous sinus with the pterygoid plexus of veins

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Foramen lacerum Lower part Meningeal branch of ascending pharyngeal artery Emissary vein from cavernous sinus

Upper part internal carotid artery nerve of pterygoid canal www.indiandentalacademy.com


RELATED STRUCTURES . . . Temporal lobes of the cerebral hemispheres Diaphragma sellae attached to tuberculum sellae

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RELATED STRUCTURES . . . Hypophysis cerebri on hypophyseal fossa Anterior end of tentorium cerebelli & petro sphenoidal ligament to post. clinoid process

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RELATED STRUCTURES . . . Cavernous sinus Superior petrosal sinus

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BONES . . . Petrous temporal bone Dorsum sellae of sphenoid bone Squamous part of occipital bone Mastoid part of temporal bone Mastoid angle of parietal bone www.indiandentalacademy.com


DESCRIPTION . . .

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FORAMEN . . .

JUGULAR FORAMEN ANTERIOR PART

Inferior petrosal sinus Meningeal branch of ascending pharyngeal artery

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JUGULAR FORAMEN MIDDLE PART 9th , 10th & 11th cranial nerves

POSTERIOR PART Internal jugular vein Meningeal branch of occipital artery www.indiandentalacademy.com


FORAMEN MAGNUM ANTERIOR PART Apical ligament of dens Membrana tectoria

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FORAMEN MAGNUM SUBARACHNOID SPACE Spinal accessory nerve Vertebral arteries Sympathetic plexus around vertebral arteries Posterior spinal arteries Anterior spinal artery

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FORAMEN . . .

FORAMEN MAGNUM POSTERIOR PART Lower part of medulla Tonsils of cerebellum Meninges

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HYPOGLOSSAL CANAL Hypoglossal nerve Meningeal branch of ascending pharyngeal artery Emissary vein connecting sigmoid sinus to internal jugular vein

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POSTERIOR CONDYLAR CANAL Emissary vein connecting sigmoid sinus to suboccipital venous plexus

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RELATED STRUCTURES . . . Apical ligament of dens Membrana tectori Flocculus of cerebellum Falx cerebri Pons & medulla Cerebellum of brain www.indiandentalacademy.com


BRAIN & THE FOSSSA

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