Navigation Links
University of Tennessee anthropologists find American heads are getting larger
Date:5/30/2012

White Americans' heads are getting bigger. That's according to research by forensic anthropologists at the University of Tennessee, Knoxville.

Lee Jantz, coordinator of UT's Forensic Anthropology Center (FAC); Richard Jantz, professor emeritus and former director of the FAC; and Joanne Devlin, adjunct assistant professor, examined 1,500 skulls dating back to the mid-1800s through the mid-1980s. They noticed U.S. skulls have become larger, taller and narrower as seen from the front and faces have become significantly narrower and higher.

The researchers cannot pinpoint a reason as to why American head shapes are changing and whether it is primarily due to evolution or lifestyle changes.

"The varieties of changes that have swept American life make determining an exact cause an endlessly complicated proposition," said Lee Jantz. "It likely results from modified growth patterns because of better nutrition, lower infant and maternal mortality, less physical work, and a breakdown of former ethnic barriers to marriage. Which of these is paramount we do not know."

The researchers found that the average height from the base to the top of the skull in men has increased by eight millimeters (0.3 inches). The skull size has grown by 200 cubic centimeters, a space equivalent to a tennis ball. In women, the corresponding increases are seven millimeters and 180 cubic centimeters.

Skull height has increased 6.8 percent since the late 1800s, while body height has increased 5.6 percent and femur length has only increased about 2 percent. Also, skull-height has continued to change whereas the overall heightening has recently slowed or stopped.

The scientists also noted changes that illustrate our population is maturing sooner. This is reflected in the earlier closing of a separation in the bone structure of the skull called the spheno-occipital synchondrosis, which in the past was thought to fuse at about age twenty. Richard
'/>"/>

Contact: Whitney Heins
wheins@utk.edu
865-974-5460
University of Tennessee at Knoxville
Source:Eurekalert

Page: 1 2

Related biology news :

1. Rice University establishes National Corrosion Center
2. Case Western Reserve University researchers track Chernobyl fallout
3. Case Western Reserve University project ties soil conservation and river management together
4. Brown University and Women & Infants Hospital expand national childrens study to Bristol County
5. NIH selects Case Western Reserve University to participate in National Childrens Study
6. US Senate confirms Clemson University engineering Dean Esin Gulari to National Science Board
7. University professor stresses links between US Navy sonar and whale strandings
8. Scent on demand: Hebrew University scientists enhance the scent of flowers
9. University success at national engineering awards
10. University of Leicester professor adds new perspective to rainforest debate
11. Providing toilets, safe water is top route to reducing world poverty: UN University
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:11/21/2014)... According to a new market ... RFID, Access Control, Intrusion Detection, Parking Management, Under Vehicle ... Service Geography - Global Forecasts to 2020", published by ... be around $25 Billion in 2014 and is expected ... CAGR of 8.69%. Browse 116 market data ...
(Date:11/21/2014)... Nov. 19, 2014  Earlier this year Donald ... College, and one of the most prolific inventors in ... are transmitted from Smartphones to third party agencies. Spector ... has one of the earliest known patents in this ... in the military, child care, elder care and hospital ...
(Date:11/21/2014)... Strict laws against distracted driving and the ... American and European automotive sector towards gesture recognition technologies. ... that are intuitive and able to retrieve information with ... New analysis from Frost & Sullivan,s Strategic ... Europe and North America ...
Breaking Biology News(10 mins):Industrial Security Systems Market Worth $38 Billion by 2020 2Industrial Security Systems Market Worth $38 Billion by 2020 3Patented Biosensor Wearable Technology Provides a More Civilized Method of Quarantine 2Patented Biosensor Wearable Technology Provides a More Civilized Method of Quarantine 3Patented Biosensor Wearable Technology Provides a More Civilized Method of Quarantine 4Gesture Recognition Intensifies with the Rise of In-car Smartphone Integration, Says Frost & Sullivan 2Gesture Recognition Intensifies with the Rise of In-car Smartphone Integration, Says Frost & Sullivan 3Gesture Recognition Intensifies with the Rise of In-car Smartphone Integration, Says Frost & Sullivan 4
... Associate Professor Michael King of the University of Rochester ... the blood for cancer and stem cells. When ... he captures stem cells, he harvests them for later ... applications that treat human disease and improve health. ...
... By imaging patterns of activity in the brain's prefrontal ... future actions, researchers have been able to distinguish cortical ... The findings, reported by a collaborative group led by ... Cognitive and Brain Sciences in Leipzig, Germany, appear in ...
... illusions are produced in the brain's visual cortex, researchers at ... rapid integration of auditory and visual sensations in the brain. ... by which visual perception can be altered by concurrent auditory ... of the Journal of Neuroscience. , When subjects were ...
Cached Biology News:Cancer-killing invention also harvests stem cells 2Cancer-killing invention also harvests stem cells 3Cancer-killing invention also harvests stem cells 4Reading hidden intentions in the human brain 2Wired for sound: How the brain senses visual illusions 2
(Date:11/27/2014)... , Nov. 27, 2014 Research ... "Global Palmitic Acid Industry Report 2014" report ... The Global Palmitic Acid Industry Report ... current state of the global palmitic acid industry. ... industry including definitions, classifications, applications and industry chain structure. ...
(Date:11/27/2014)... 2014 Spartan Bioscience today announced that ... Drug Safety (MFDS) regulatory approval for its Spartan ... in less than 60 minutes from a non-invasive cheek ... aid for doctors to determine therapeutic strategies for drugs ... some of the world’s most commonly prescribed drugs such ...
(Date:11/27/2014)... England , November 27, 2014 ... online on ScienceDirect   Elsevier , ... products and solutions, is pleased to announce the launch ... . The launch of ... the rapid advances at the forefront of applied sciences ...
(Date:11/27/2014)... , November 27, 2014 ... revolutionising the management of tooth decay, today announces ... of its Calcivis® Caries Activity Imaging System. ... a sophisticated medical device and consumable combination designed ... caries (tooth decay). It involves a unique, proprietary ...
Breaking Biology Technology:Global Palmitic Acid Industry Report 2014 2Spartan Bioscience Receives Korean Regulatory Approval for First Rapid DNA Test of Mutations Affecting Metabolism of Common Drugs 2Spartan Bioscience Receives Korean Regulatory Approval for First Rapid DNA Test of Mutations Affecting Metabolism of Common Drugs 3Elsevier Announces the Launch of a New Journal: Extreme Mechanics Letters 2Elsevier Announces the Launch of a New Journal: Extreme Mechanics Letters 3Calcivis Completes Clinical Study of Novel Caries Activity Imaging System 2Calcivis Completes Clinical Study of Novel Caries Activity Imaging System 3
... RNA later Tissue Collection: RNA , ... , Problem: ... processing or appropriate storage of the tissue or cell , ... followed by immediate disruption in lysis buffer. , ...
... The first step in preparing a plasmid for siRNA , ... of interest , that are susceptible to ... a little more than half of the siRNAs provide at least a 50% , ... siRNAs , provide a 75-95% reduction. The ...
... dsRNA that , most efficiently silences the gene ... correlate with silencing efficiency? Ambion scientists , addressed ... dsRNA of different sizes and directed , ... (Figure 1A), were prepared using the MEGAscript RNAi Kit , ...
Cached Biology Technology:Stabilizing RNA in Fresh and Frozen Tissues for RNA Isolation 2Stabilizing RNA in Fresh and Frozen Tissues for RNA Isolation 3Stabilizing RNA in Fresh and Frozen Tissues for RNA Isolation 4Selecting siRNA Sequences to Incorporate into the pSilencer Vectors 2Selecting siRNA Sequences to Incorporate into the pSilencer Vectors 3Selecting siRNA Sequences to Incorporate into the pSilencer Vectors 4RNAi: Size Does Matter 2