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Bone Measurement “How To” Guide

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2 ways to measure bones Measure lengths and widths Measure angles

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**Inside Measurement Nasal Width Measure at widest spot**

Measuring with Calipers – inside measurements place calipers inside space spread out until touch both edges of object read bottom row labeled ‘inside’

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**Reading Calipers: Inside Measurement**

Second # is the first spot bottom and top lines match up. Read as a decimal. = .1 Measurement 40.1 mm First # is where 0 lines up. = 40

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You try… What is the inside measurement reading? Answer: 35.1mm

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**Outside Measurement Nasal Height Nasion to Nasal Spine**

Measuring with Calipers – outside measurements place calipers on outside of area bring in until touch both edges of object read top row labeled ‘outside’

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**Reading Calipers: Outside measurement**

First # is where 0 lines up. = 40 Measurement 40.1 mm Second # is the first spot bottom and top lines match up. Read as a decimal. = .1

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You try… What is the outside measurement reading? Answer: 10.1mm

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**Measurement with a protractor**

2. 0 line along one side of angle 1. Dot directly under 90 at vertex of angle 3. Measurement value where angle’s other side crosses protractor Answer: 120 degrees

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You try…. What is the measurement of this angle? Answer: 70 degrees

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**Pelvic measurement: sub-pubic angle**

dot of protractor on pubic symphysis where bones meet ramus of L. ischium Pubic symphysis 0 line along ramus of left ischium read measurement on ramus of right ischium Answer: 77 degrees

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Sources Ward’s Natural Sciences Sherlock Bones: Identification of skeletal remains. p.10,11,12, 16, and pelvis, skull

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