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Ch. 8 The Appendicular Skeleton
Martini - Fundamentals of Anatomy & Physiology 11th Edition
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089Not the one you use?Change textbook
All textbooksMartini, Nath, Bartholomew 11th EditionCh. 8 The Appendicular SkeletonProblem 26
Chapter 8, Problem 26

Investigators find the pelvis of a human and are able to identify the sex, the relative age, and some physical characteristics of the person. How is this possible from only the pelvis?

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1
Understand that the pelvis is a key skeletal structure that exhibits distinct differences between males and females, which allows investigators to determine sex. For example, female pelves tend to be wider and have a larger pelvic inlet to facilitate childbirth, while male pelves are generally narrower and more robust.
Recognize that age estimation can be made by examining the pelvis because certain features change predictably over time. For instance, the degree of fusion of pelvic bones, the texture of the bone surface, and the wear on the pubic symphysis can indicate whether the individual was young, middle-aged, or elderly.
Note that physical characteristics such as body size and muscle attachment sites can be inferred from the pelvis. Robust muscle attachment areas suggest stronger musculature, which can give clues about the person's physical activity or build.
Combine observations of pelvic morphology, bone texture, and wear patterns to form a comprehensive profile of the individual’s sex, age, and physical traits.
Summarize that the pelvis serves as a biological record because its shape and condition reflect both genetic sex differences and changes due to aging and lifestyle, making it a valuable tool in forensic and anthropological investigations.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Sexual Dimorphism in the Pelvis

The human pelvis exhibits distinct differences between males and females, known as sexual dimorphism. Female pelves are generally wider and have a larger pelvic inlet to facilitate childbirth, while male pelves are narrower and more robust. These structural differences allow forensic anthropologists to estimate the sex of an individual from pelvic bones.
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Age Estimation from Pelvic Features

Certain features of the pelvis change predictably with age, such as the fusion of pelvic bones and the wear on joint surfaces. For example, the pubic symphysis undergoes morphological changes that can be used to estimate an individual's relative age at death. These age-related markers help investigators determine how old the person was.
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Physical Characteristics Inferred from Pelvic Morphology

The pelvis can reveal physical traits like body size, stature, and sometimes ancestry through its shape and robustness. Muscle attachment sites and bone thickness provide clues about the individual's physical activity and health. These characteristics help build a biological profile from skeletal remains.
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Related Practice
Textbook Question

Jack injures himself playing hockey, and the physician who examines him informs him that he has dislocated his pollex. What part of Jack's body did he injure?

(a) his arm

(b) his leg

(c) his hip

(d) his thumb

(e) his shoulder.

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Textbook Question

While fireman Fred is fighting a fire in a building, part of the ceiling collapses, and a beam strikes him on his left shoulder. He is rescued, but has a great deal of pain in his shoulder. He cannot move his arm properly, especially in the anterior direction. His clavicle is not broken, and his humerus is intact. What is the probable nature of Fred’s injury?

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Textbook Question

Why is the tibia, but not the fibula, involved in the transfer of weight to the ankle and foot?

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