Axial Skeleton

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Axial Skeleton. The Skull. The Skull. Two parts of the skull: The cranium encloses and protects the brain The facial bones hold the eyes and face shape. The Skull - Cranium. Eight large flat bones fused together ( sutures ): Frontal – forms forehead - PowerPoint PPT Presentation

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Axial Skeleton The Skull

The SkullTwo parts of the skull:The cranium encloses and protects the brainThe facial bones hold the eyes and face shape

The Skull - CraniumEight large flat bones fused together (sutures):Frontal forms foreheadParietal superior and lateral walls (paired)Temporal inferior to parietal, at temples (paired)Occipital posterior wallSphenoid deep to the anterior of skull, forms floor of cranial cavityEthmoid forms roof of nasal cavity, medial walls of orbitsThe Skull - Cranium

The Skull - Cranium

The Skull - Cranium

The Skull - Cranium

The Skull - Cranium

The Skull - Cranium

The Skull - FaceThirteen bones fused together, with one connected by jointsMaxillae forms upper jaw (paired)Palatine posterior to maxillae, between back molars (paired)Zygomatic cheekbones, lateral walls of orbits (paired)Lacrimal part of medial walls of orbits, between ethmoid bones and maxillae (paired)The Skull - FaceContinuedNasal bridge of nose (paired)Vomer median line of nasal cavityInferior conchae bone projections from lateral wall of nasal cavity (paired)Mandible lower jaw, connected by only freely movable joint of faceThe Skull - Face

The Skull - Face

The Skull - Face

The Skull - Face

The Skull - Face

The Skull - Face

The Skull - Face

The Skull - Face

The SkullHyoid BoneNot technically part of skullDoes not articulate directly with any other boneAnchored to temporal bones by ligamentsMovable base for tongueAttachment point for neck musclesThe Skull

The Skull Bone MarkingsBone MarkingsMeatus canal-like passagewayExternal Auditory Meatus canal leads to eardrum and middle ear (temporal)Process bony prominenceStyloid Process inferior to auditory meatus (temporal)Zygomatic Process anterior to cheek bone (temporal)Mastoid Process posterior and inferior to auditory meatus (temporal)Palatine Processes extensions of maxillae that form the anterior part of the mouth (maxillae)The Skull Bone MarkingsForamen opening through boneJugular Magnum at junction of occipital & temporal bones, opening for jugular vein (temporal)Carotid Canal anterior to jugular foramen, opening for carotid artery (temporal)Foramen Magnum opening for spinal cord to connect to brain (occipital)Foramen Ovale opening for nerve fibers to pass to jaw muscles (sphenoid)Condyle rounded articular projections (involved with joints)Occipital Condyles rest on the first vertebra of the spinal column (occipital)Sinuses cavities in bone filled with airParanasal Sinuses found in different bones surrounding nasal cavity (frontal, ethmoid, sphenoid, maxillae)The Skull Bone Markings

The Skull Bone Markings

The Skull Bone Markings