04_Skeletal_System_Axial_Skeleton

04_Skeletal_System_Axial_Skeleton - TheAxialSkeleton...

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The Axial Skeleton
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Types of Bones 5 basic types of bones: Long = compact Short = spongy except  surface Flat = plates of compact  enclosing spongy Irregular = variable Sesamoid = develop in  tendons or ligaments  (patella) Sutural bones = in joint  between skull bones
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The Skeletal System: The Axial Skeleton Axial Skeleton 80 bones Lie along longitudinal axis Skull, hyoid, vertebrae,  ribs, sternum, ear  ossicles Appendicular Skeleton pelvic & pectoral girdles
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SKULL Composed of 22 bones: Cranial  bones ( cranium ) Facial  bones ( face ) General features: The  skull  forms the large cranial cavity and smaller  cavities  (including the nasal cavity and orbits—eye sockets) Paranasal sinuses:  mucous-lined cavities in the skull Mandible: the only moveable bone of the skull  (other than  the ear ossicles within the temporal bones) Sutures:  immovable joints that hold the skull bones  together
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The Skull 8 Cranial bones 14 Facial bones protect delicate sense organs – smell, taste, vision support entrances to digestive and respiratory systems
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The 8 Cranial Bones Frontal Parietal (2) Temporal (2) Occipital Sphenoid Ethmoid
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Frontal Bone Supraorbital margin and frontal sinus A “ black eye ” results from accumulation of fluid and blood in the upper  eyelid following a blow to the relatively sharp supraorbital margin  (brow line).
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Temporal Bones Parietal Temporal temporal squama zygomatic process forms part  of arch external auditory meatus mastoid process styloid process stylomastoid foramen (VII) mandibular fossa (TMJ) petrous portion (VIII)
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Temporal and Occipital bones Temporal carotid foramen (carotid artery) jugular foramen (jugular vein) Occipital foramen magnum occipital condyles external occipital  protuberance attachment  for ligamentum nuchae lines
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Sphenoid bone Base of skull Pterygoid processes are  attachment sites for jaw   muscles
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Sphenoid in Anterior View Body is a cube like portion holding sphenoid  sinuses Greater and lesser wings Pterygoid processes
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Sphenoid from Superior View Sella turcica holds pituitary gland Optic foramen
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Ethmoid Bone The  ethmoid bone   forms: part of the anterior  portion of the cranial  floor the medial wall of  the orbits the superior portion 
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This note was uploaded on 11/16/2011 for the course EXSS 175 taught by Professor Zinder during the Fall '08 term at UNC.

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04_Skeletal_System_Axial_Skeleton - TheAxialSkeleton...

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