07_LectureOutline

07_LectureOutline - An Introduction to the Axial Skeleton...

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An Introduction to the Axial Skeleton Structures of Bones Articulations Contacts with other bones Landmarks (Bone Markings; Marks) Areas of muscle and ligament attachment Foramina Openings for nerves and blood vessels The Axial Skeleton Forms the longitudinal axis of the body Has 80 bones The skull : 8 cranial bones 14 facial bones Bones associated with the skull: 6 auditory ossicles the hyoid bone The vertebral column 24 vertebrae (singular = vertebra) The sacrum The coccyx The thoracic cage 24 ribs The sternum Functions of the Axial Skeleton Supports and protects organs in body cavities Attaches to muscles of Head, neck, and trunk Respiration Appendicular skeleton The Skull The skull protects The brain Entrances to respiratory system Entrance to digestive system The skull contains 22 bones
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8 cranial bones : Form the braincase or cranium 14 facial bones : Protect and support entrances to digestive and respiratory tracts Cranial Bones Enclose the cranial cavity Which contains the brain And its fluids, blood vessels, nerves, and membranes Facial Bones Superficial facial bones For muscle attachment Deep facial bones Separate the oral and nasal cavities Form the nasal septum Superficial Facial Bones Maxillae = maxillary bones Lacrimal Nasal Zygomatic Mandible Deep Facial Bones Palatine bones Inferior nasal conchae Vomer Sinuses Cavities that decrease the weight of the skull Lined with mucous membranes Protect the entrances of the respiratory system Sutures The immovable joints of the skull The four major sutures Lambdoid suture Coronal suture Sagittal suture Squamous suture Lambdoid Suture Separates occipital from parietal bones May contain sutural (Wormian) bones Coronal Suture Attaches frontal bone to parietal bones The calvaria (skullcap) Consists of occipital, parietal, and frontal bones Sagittal Suture Between the parietal bones
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From lambdoid suture to coronal suture Squamous Sutures Form boundaries between temporal bones and parietal bones The Cranial Bones of the Skull The Cranial Bones Occipital bone Parietal bones Frontal bone Temporal bones Sphenoid Ethmoid The Occipital Bone Functions of the occipital bone Forms the posterior and inferior surfaces of the cranium Articulations of the occipital bone Parietal bones Temporal bones Sphenoid First cervical vertebra ( atlas ) Marks of the occipital bone External occipital protuberance External occipital crest: to attach ligaments The Occipital Bone Marks of the occipital bone Occipital condyles: articulate with neck Inferior and superior nuchal lines : attachment site of muscles and ligaments
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This note was uploaded on 12/29/2011 for the course BIOLOGY 24011 taught by Professor Pan during the Fall '11 term at HCCS.

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07_LectureOutline - An Introduction to the Axial Skeleton...

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