Biology > QUESTIONS & ANSWERS > Summary ASM 275 / ASM275 Estimating Age - Adults (Lab 10) (All)
Summary ASM 275 / ASM275 Estimating Age - Adults (Lab 10)
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Estimating Age - Adults (Lab 10) This content is available for you to study, but isn't worth marks About this material Answer feedback is ON REVIEW Unlimited attempts per question Due: No due dat... e Exported for Carolyn Ginger on Wed, 07 Nov 2018 06:50:47 GMT Pubic symphysis with residual billowing on the face. [1] 11/6/2018 Top Hat https://app.tophat.com/e/037705/assigned#bf0a4069-44c2-43fb-8daf-bda73edb1e15 2/32 By the end of this lab, the student will be able to: Describe the biological basis for adult age estimation using skeletal indicators. Describe the biological and anatomical basis for the changes in the pubic symphysis. Evaluate cranial suture closure as an indicator of age and apply a standard approach for scoring cranial suture closure and generating an age estimate. Apply charts of epiphyseal union timing to estimate age at death. Age Estimation from Skeletal Traits Joint Deterioration During the process of aging, joint surfaces (where two bones meet or articulate) change in their morphology. Through joint deterioration, the surfaces change from being smooth and organized in appearance to more disorganized in appearance, porous and with bone growth (called osteophytes) around the edges of the joints. Several joints in the skeleton provide better estimators of age because their breakdown follows established processes. These include the pubic symphysis, the auricular surface, and the sternal ends of the ribs (the 4th rib in particular). Here we will focus on the pubic symphysis because it is a classic method and the easiest to understand and apply. Because developmental traits, like the ones used to age subadults, proceed more regularly and consistently than degenerative traits, age estimates for subadults tend to be more accurate and within a smaller range of error than age estimates for adults and the elderly. That is, whereas subadult age estimates may be +/- months, adult age estimates will be +/- years, and in many cases the age range can be larger than a decade. Pubic Symphysis Aging 11/6/2018 Top Hat https://app.tophat.com/e/037705/assigned#bf0a4069-44c2-43fb-8daf-bda73edb1e15 3/32 The pubic symphysis is the joint that connects the os coxae on the anterior portion of the pelvic girdle. Although mostly immobile, the joint does experience some movement, which results in cumulative changes in the joint surface as you age. The details of this process are slightly beyond this level of course, but some broad strokes are possible. Imagine separating the pelvis at the pubic symphysis as shown below. All subsequent images are as if you were looking straight at the face of the pubic symphysis [Show More]
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