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:10/18/2014)... 2014 Psychological stress and stress-related psychiatric disorders are ... but the molecular mechanisms underlying this relation ... to the development of targeted preventive strategies ... devastating diseases. This work is presented at ... Berlin., Now an international group of researchers ...
(Date:10/17/2014)... shown for the first time how bacteria can grow ... them the opportunity to get tremendous insights into bacteria ... also discovered the bacterial growth in chronic lung infections ... down by the immune cells. The researchers discovered the ... the bacteria, forcing the bacteria to switch to a ...
(Date:10/16/2014)... the bowel lining develops and, in the process, suggested ... The researchers produced evidence that stem cells are responsible ... feature of the bowel lining, and believe these stem ... finding as scientists are still divided on the stem ... Wee Tan and Professor Tony Burgess from the Walter ...
Breaking Biology News(10 mins):Researchers find why depression and aging linked to increased disease risk 2Scientists opens black box on bacterial growth in cystic fibrosis lung infection 2Cryptic clues drive new theory of bowel cancer development 2
... CORVALLIS, Ore. Fungi have significant potential for "horizontal" ... mechanisms that allow bacteria to evolve so quickly, become resistant ... to be published Thursday in the journal Nature , ... make-up of their genomes and become infectious to plants and ...
... like a mashup of monster movies, but palaeontologists have discovered ... a killing that took place 4 million years ago. ... by careful, forensic-style analysis of bite marks on an otherwise ... have reconstructed the events that led to the death of ...
... scientists have successfully used geometrically patterned surfaces to influence ... a departure from that of many stem-cell biologists, who ... controlling the fate of stem cells. "The cells ... it,s the shape alone that,s dictating whether they turn ...
Cached Biology News:Fungi can change quickly, pass along infectious ability 2Jaws -- 4 million B.C. 2
(Date:10/22/2014)... 2014 WriteResult, LLC – a ... been working with a team of researchers from Yale ... Community Farming Collaborative to provide electronic questionnaire data collection ... study, which started in May, aims to evaluate the ... weekly exposure to and participation in urban agriculture to ...
(Date:10/22/2014)... Rock Hill, SC (PRWEB) October 22, 2014 ... the expansion of its cardiovascular pharmacogenetics menu, which ... improved patient outcomes. With PCLS’s evidence-based results, ... individual needs and optimize their therapy, while minimizing ... , In the U.S., according to the FDA ...
(Date:10/22/2014)... , Oct. 22, 2014 /PRNewswire/ - iCo Therapeutics ("iCo" ... announced next steps for its Oral Amphotericin B ... its in vitro work involving samples ... now plans to complete pre clinical studies and ... Phase 1A clinical trial, utilizing approximately $700,000 of ...
(Date:10/22/2014)... and HONG KONG , Oct. 22, ... therapeutics enterprise, announced today that rare disease expert ... vice president, research. Dr. McKew brings more than two ... positions at the National Institutes of Health, Wyeth Research ... Wyeth). Dr. McKew will lead aTyr,s efforts to expand and ...
Breaking Biology Technology:myPROpad™ Topic of Panel Discussion at the Yale Food Systems Symposium 2myPROpad™ Topic of Panel Discussion at the Yale Food Systems Symposium 3PCLS Announces Expansion of Cardiovascular Pharmacogenetic Testing Menu 2PCLS Announces Expansion of Cardiovascular Pharmacogenetic Testing Menu 3iCo Therapeutics Announces Advancement of Oral Amphotericin B Program 2iCo Therapeutics Announces Advancement of Oral Amphotericin B Program 3aTyr Pharma Appoints John C. McKew, Ph.D., as Vice President, Research 2aTyr Pharma Appoints John C. McKew, Ph.D., as Vice President, Research 3
... York are pioneering the development of electron microscopes which ... materials in new revolutionary ways., The team, headed by ... University,s Department of Physics has created electron beams with ... will open the way to many novel applications including ...
... Inc. announced today the publication of key results relating ... discovery for high-value G-protein-coupled receptor (GPCR) targets in ... of a Lipid G Protein-Coupled Receptor," was co-authored by ... Ph.D., and Raymond Stevens, Ph.D. Drs. Rosen and Stevens ...
... Pa., Feb. 16, 2012  BioDelivery Sciences International, Inc. (Nasdaq: ... Trademark Office (USPTO) has issued a Notice of Allowance ... granted, will extend the exclusivity of the BioErodible MucoAdhesive ... Buprenorphine/Naloxone from 2020 to 2027.  A ...
Cached Biology Technology:York researchers create 'tornados' inside electron microscopes 2Receptos Scientists Publish Determination of a High Resolution Sphingosine 1-Phosphate Receptor 1 Structure in Science 2Receptos Scientists Publish Determination of a High Resolution Sphingosine 1-Phosphate Receptor 1 Structure in Science 3Receptos Scientists Publish Determination of a High Resolution Sphingosine 1-Phosphate Receptor 1 Structure in Science 4BioDelivery Sciences Receives Patent Allowance Triggering $15 Million Milestone Payment from Endo Pharmaceuticals 2BioDelivery Sciences Receives Patent Allowance Triggering $15 Million Milestone Payment from Endo Pharmaceuticals 3BioDelivery Sciences Receives Patent Allowance Triggering $15 Million Milestone Payment from Endo Pharmaceuticals 4BioDelivery Sciences Receives Patent Allowance Triggering $15 Million Milestone Payment from Endo Pharmaceuticals 5