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Lecture 2

Bass Reading for Week 2.docx

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University of Toronto Mississauga
Carolan Wood

Notes From Reading For week 2BASS PP 3945 5460Pp 3945Occipital Bone Unpaired The occipital bone is connected by sutures with the two parietals lambdoidal suture the two temporals along the mastoid margin and the sphenoid basilar suture This is the only bone of the skull that articulates with the postcranial skeletonThe articulation is through the occipital condyles with the first cervical vertebra atlasThe largest hole of the skull the foramen magnum through which the spinal cord enters the skull is located on the inferior surface between the occipital condyles The occipital develops in four partsoBasilaranterior to foramen magnum articulates at the basilar suture with the sphenoid and is the smallest of the four partsoTwo lateralsform the sides of the foramen magnum they articulate with the temporal bones The major part of occipital condyles is located on the lateral portionsoSquamous posterior to the foramen magnum the largest of the four parts composed of the interparietal and supraoccipital portionsAnatomical Characteristics Exterior surfaceoExternal occipital protuberancemidway between the superior border lambdoidal suture and the posterior margin of the foramen magnumoSuperior nuchal linearching laterally on each side from the external occipital protuberance toward the lateral angles of the boneoInferior nuchal lineruns laterally from the middle of the external occipital crest to the jugular processoExternal occipital crestmedian ridge running from external occipital protuberance to foramen magnumoOccipital condylesarticular surfaces for the first cervical vertebra Cerebral surfaceoInternal occipital crestis a median ridge that divides as it approaches the foramen magnum and becomes less defined Bones of Similar Shape where Confusion May Arise The following cranial bones are all flat frontal parietals and temporalsIn the postcranial skeleton the capula and innominates also have abroad flat surface Information of Importance in Identification Articular surfaces occur on only three cranial bones1Occipital with the occipital condyles2Temporal with the temporomandibular joint a shallow depression or fossa on the temporal bone for the articulation of the condyle of the mandible3The condyles of the mandible The occipital condyles are convex the temporomandibular articular surfaces are concave The internal configuration exhibits two crests that divide the surface into four parts whch is a feature distinguishing it from the frontal bone The jugular foramen is a fairly large openin lateral to the foramen magnum and is between the occipital and the temporal bones Temporal Bone PairedLocated at the side and base of the cranium the temporal bone is elbow the parietal posterior to the sphenoid and anterior to the occipital
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