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Lecture 19 SkullBrain Blood Supply.pdf - MPAS 500: HUMAN...

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MPAS 500: HUMAN GROSS ANATOMYThe Skull, Brain, and ItsBlood Supply
The SkullComprised of 22 bones (excludingossicles of the ear)Joined mostly by immovable suture jointsUpper partCalvariaSurrounds cranial cavity and protectsthe brainProvides attachment for head and neck musclesLower partFacial skeletonContains apertures for eyes, nasal cavity, andoral cavityProvides attachment for muscles of facialexpression and mastication
Anterior ViewFrontal boneSupraorbital foramen (or notch)Point at which supraorbital nerve exits the skullZygomatic bones‘Cheek’ bonesNasal bones‘Bridge’ of the noseMaxillaInfraorbital foramenPoint at which infraorbital nerve exits the skullMandibleMental foramenPoint at which mental nerve exits the skull
Lateral ViewParietal boneTemporal boneSquamous partTemporal fossaàCovered by temporalis muscleZygomatic archTympanic partExternal auditory meatusLateral opening of the ear canalPetrous partMastoid processMandibleBody and ramus meet at the angle of the jawCondylar processHead articulates with temporal bone to form TMJCoronoid processAttachment for temporalisMandibular notch
Posterior ViewOccipital boneExternal occipital protuberanceNuchal lines
Inferior ViewHard palateMaxilla and palatine bonesIncisive fossaSphenoid boneMedial pterygoid plateLateral pterygoid plateAttachment for medial and lateral pterygoid musclesOccipital boneBasilar portionAttachment for deep neck flexorsOccipital condylesArticulate with articular facet of C1Foramen magnum
Sutures of the SkullCoronal sutureSeparates frontal and parietal bonesLambdoid sutureSeparates parietal and occipital bonesSquamous sutureSeparates parietal and temporal bonesPterionJunction of frontal, parietal, sphenoid, andtemporal bonesClinically important due to consequences ofskull fracture in this area
Cranial FossaeForm the floor of the cranial cavityAnterior cranial fossaFilled with frontal lobes of the brainMiddle cranial fossaFilled by temporal lobes of the brainPosterior cranial fossaLargest and deepest of the 3 cranial fossaeContains brainstem and cerebellum
Anterior Cranial FossaFrontal boneRoof of the orbitSphenoid boneLesser wing of sphenoidSeparates anterior from middle fossaEthmoid boneCrista galliProjects upward from ethmoid boneAnterior attachment for falx cerebriCribriform platePerforated part of ethmoid boneOlfactory n. (CN I) passes through toreach nasal cavity
Middle Cranial FossaSphenoid boneSella turcicaSaddle-shaped central portion of sphenoid boneHypophysial fossaCentral depression that contains pituitary glandDorsum sellaePosterior wall of sella turcicaGreater wing of sphenoidFloor of the fossa on either side of sella turcicaTemporal bonePetrous portionRoof over middle and inner ear

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Term
Fall
Professor
Dr. Aschliman
Tags
Occipital bone, Internal carotid artery, cranial cavity, Arteries of the head and neck

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