CHP8 The Skeletal System

Petrous parts squamous flat vertical portion

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Unformatted text preview: alis muscle Marked temporal 2 temporal bones= form lateral wall & part of cranial floor • 4 parts= squamous, tympanic, mastoid, petrous parts • Squamous= flat vertical portion encircled by squamous suture • Zygomatic process, mandibular fossa & TMJ • Tympanic= ring of bone around external auditory meatus • Styloid process for muscle attachment of tongue, pharynx, hyoid • Mastoid= houses air sinuses of mastoid process (mastoiditis) • attachment of digastric muscle • Petrous= separates middle & posterior cranial fossa; houses middle & inner ear cavities • Internal acoustic meatus, carotid canal, jugular foramen Parietal & Temporal Bones Parietal Carotid canal Jugular foramen Squamous Tympanic Tympanic Mastoid Petrous part Occipital Bone Occipital Occipital bone= rear (occiput) & much of base of skull • Foramen magnum= holds spinal cord & attachment area for holds dura mater dura • Occipital condyles= smooth knobs where skull rests on atlas • Hypoglossal canal lies laterally to each condyle • External occipital protuberance for nuchal ligament (binds skull to vertebral column) skull • Nuchal lines mark attachment areas for neck & back muscles (external occipital crest runs vertically btw 2 lines) runs • Venous sinuses drain blood from brain before exiting brain via internal jugular veins jugular Sphenoid Bone Sphenoid Sphenoid= body & greater/lesser wings (moth shape), forms ½ body middle cranial fossa & hou...
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