chapter_8_bones_le

chapter_8_bones_le - The Skeletal System Overview of the...

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8-1 The Skeletal System Overview of the skeleton The skull The vertebral column and thoracic cage The pectoral girdle and upper limb The pelvic girdle and lower limb
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8-2 Overview of the Skeleton Regions of the skeleton axial skeleton = central axis skull, vertebral column, ribs, sternum and sacrum appendicular skeleton = limbs and girdles Number of bones 206 in typical adult skeleton varies with development of sesamoid bones (patella) start at 270 at birth, decreases with fusion Surface markings defined in Table 8.2
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8-3 Surface Features of Bones
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8-4 Axial and Appendicular Skeleton Axial skeleton in tan skull, vertebrae, sternum, ribs, sacrum and hyoid Appendicular skeleton in green pectoral girdle upper extremity pelvic girdle lower extremity
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8-5 Major Skull Cavities
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8-6 The Skull 22 bones joined together by sutures Cranial bones surround cranial cavity 8 bones in contact with meninges frontal, parietal, calvaria (skullcap) forms roof and walls Facial bones support teeth and form nasal cavity and orbit 14 bones with no direct contact with brain or meninges attachment of facial and jaw muscles
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8-7 Cranial Fossa 3 basins that comprise the cranial floor or base anterior fossa holds the frontal lobe of the brain middle fossa holds the temporal lobes of the brain posterior fossa contains the cerebellum Swelling of the brain may force tissue through foramen magnum resulting in death
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8-8 Frontal Bone Forms forehead and part of the roof of the cranium Forms roof of the orbit Contains frontal sinus
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8-9 Parietal Bone Cranial roof and part of its lateral walls Bordered by 4 sutures coronal, sagittal, lambdoid and squamous Temporal lines of temporalis muscle Temporal lines
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8-10 Temporal Bone Lateral wall and part of floor of cranial cavity squamous part zygomatic process mandibular fossa and TMJ tympanic part external auditory meatus styloid process mastoid part mastoid process mastoiditis from ear infection mastoid notch digastric muscle
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8-11 Petrous Portion of Temporal Bone Part of cranial floor separates middle from posterior cranial fossa Houses middle and inner ear cavities receptors for hearing and sense of balance internal auditory meatus = opening for CN VII ( vestibulocochlear nerve )
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8-12 Right Temporal Bone
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8-13 Openings in Temporal Bone Carotid canal passage for internal carotid artery supplying the brain Jugular foramen irregular opening between temporal and occipital bones passageway for drainage of blood from brain to internal jugular vein
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8-14 Occipital Bone Rear and base of skull spinal cord occipital condyles supplying tongue muscles External occipital protuberance for nuchal ligament Nuchal lines mark neck muscles
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Sphenoid Bone Lesser wing Greater wing Body of sphenoid Medial and lateral pterygoid
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This note was uploaded on 02/25/2011 for the course BIO 210 taught by Professor Parreve during the Fall '10 term at CUNY Hunter.

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chapter_8_bones_le - The Skeletal System Overview of the...

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