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PIMA BIO130
CHP8 Skeletal; Cranial Bones and Their Markings; Occipital
Question | Answer |
---|---|
Occipital | Forms the posterior part of the cranial floor and walls |
Foramen Magnum | Hole through which the spinal cord enters the cranial cavity |
Occipital Condyles | Convex, oval processes on either side of the foramen magnum; articulate with depressions on the first cervical vertebrae |
External Occipital Protuberance | Prominent projection on the posterior surface in the midline a short distance above the foramen magnum; can be felt as a definite bump |
Superior nuchal line | Curved ridge extending laterally from the external occipital protuberance |
Inferior nuchal line | Less well defined ridge paralleling the superior nuchal line a short distance below it |
Internal Occipital Protuberance | Projection in the midline on the inner surface of the bone; grooves for the lateral sinuses extend laterally from this process and one for sagittal sinus extends upward from it. |