Navigation Links
Anthropologist's studies of childbirth bring new focus on women in evolution
Date:2/17/2009

our ancestors evolved to begin walking on two legs, Rosenberg says, this upright posture created a wide but short opening in the pelvis in which the baby must travel, requiring a new form of birth so that the baby could find its way through a now tight birth canal.

According to Rosenberg, the average pelvic opening in women today is 13 centimeters at its largest diameter and 10 centimeters at its smallest. The average infant head is 10 centimeters from front to back, and the shoulders are 12 centimeters across. And today the birth canal is a twisty tunnel subjecting the infant to a series of complex twists and turns on its way out.

"Until recently, there was a sexism in the study of evolution," Rosenberg says. "Researchers focused on men and the tools they used in hunting, and these things were more difficult to connect to reproductive success and hence to natural selection," she notes.

"With childbirth, as well as many of the other things that happen to women -- pregnancy, nursing, menopause -- it's really easy to see how natural selection works," Rosenberg notes.

Childbirth is just one of a series of examples throughout a woman's life cycle, in which enlisting the help of other women significantly improves reproductive outcomes, according to Rosenberg.

"Women take up the slack for other women when they are pregnant and nursing so that they have the energy to devote to their infants. Cooperative childcare is something in which women help each other out. Often, but not always, these helpers are post-reproductive women who have fewer of those responsibilities of their own, but may be helping out their daughters. All of this puts a great selective premium on a kind of social intelligence that many scientists think partly accounts for the increase in brain size that happened over the last two million years," she notes.

How will women and childbirth continue to evolve? Will the birth canal grow narrower, or wider? Wi
'/>"/>

Contact: Tracey Bryant
tbryant@udel.edu
302-831-8185
University of Delaware
Source:Eurekalert  

Page: 1 2 3

Related medicine news :

1. In flurry of studies, researcher details role of apples in inhibiting breast cancer
2. Shionogi Announces Positive Top-Line Efficacy Results from Year-Long Studies of Velneperit, a Novel NPY Y5 Receptor Antagonist Being Investigated for the Treatment of Obesity
3. Cardiovascular Disease and Diabetes: New Blog and Slide Presentation on the Diabetes Best Practices Website Discuss the Most Recent Studies in this Field
4. Virtual studies answer real questions
5. iCardiac's Highly Automated QT(sm) Technology Now Validated in Over 10 Clinical QT Studies
6. Embrace a Healthy Florida Pumps Up Studies on Childhood Obesity
7. Senesco Announces Results of Pre-Clinical Efficacy, Toxicology and Dose Ranging Studies for Multiple Myeloma Therapeutic Candidate
8. Torrey Pines Institute for Molecular Studies Opens New Headquarters in Florida
9. Studies Struggle to Gauge Glucosamines Worth
10. Skin color studies on tadpoles lead to cancer advance
11. Nuvo Research Announces Successful Completion Of All Pennsaid(R) Studies
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Anthropologist's studies of childbirth bring new focus on women in evolution
(Date:9/18/2014)... 2014 (HealthDay News) -- Daily supplements of selenium or ... development of age-related cataracts among men, a new study ... or both could help prevent cataracts. To investigate this ... Harvard Medical School in Boston, and his colleagues examined ... vitamin E. The trial was initially designed to study ...
(Date:9/18/2014)... Lake City, UT (PRWEB) September 18, 2014 ... North America will be recognizing their shared fundraising impact ... on Thursday, Sept. 25. , The first-ever Dance Marathon ... more than $20 million projected to be raised by ... their community’s CMN Hospital. Donations generated through Dance Marathon ...
(Date:9/18/2014)... scientists have developed a new method to study Ebola ... The Wildlife Conservation Society (WCS)-led research, published today in ... the use of fecal samples from wild great apes ... the virus. This represents a new tool for performing ... way Ebola virus is studied and improve our understanding ...
(Date:9/18/2014)... Dangerous new pathogens such as the Ebola virus invoke ... such as the bubonic plague are still providing researchers ... infections. , In a study published online Sept. 18, ... Duke Medicine and Duke-NUS Graduate Medical School Singapore detail ... hitchhike on immune cells in the lymph nodes and ...
(Date:9/18/2014)... Technology Association of Georgia in collaboration ... TAG Social Savvy Awards this week at a special ... Center in Downtown Atlanta. The event celebrates Georgia’s best ... was honored with the 2014 TAG Social Savvy People’s ... innovators in 6 other award categories: , ...
Breaking Medicine News(10 mins):Health News:Vitamin E, Selenium Supplements Don't Seem to Prevent Cataracts 2Health News:250 Campuses Usher in School Year of Saving Kids’ Lives During First-Ever “Dance Marathon Day” on Sept. 25 2Health News:Research yields a game changer for improving understanding of Ebola and great apes 2Health News:Research yields a game changer for improving understanding of Ebola and great apes 3Health News:New insights on an ancient plague could improve treatments for infections 2Health News:Winners Honored at 2014 TAG Social Savvy Awards 2Health News:Winners Honored at 2014 TAG Social Savvy Awards 3
... A group of Northeast Ohio breast,cancer survivors continue to ... the disease by participating in the sport of Dragon ... canoeing, involves a team of 22,paddlers racing in 40-foot-long ... the team offers women living with breast cancer an,opportunity ...
... Increasing temperatures, carbon dioxide levels add to discomfort of ... Add increased suffering for people with ragweed allergies to ... new study suggests. , Recent research indicates that ... longer ragweed seasons and more concentrated pollen counts, says ...
... certain genotype more affected, study finds , , MONDAY, Aug. ... containing codeine may be unwittingly risking the health of ... indicates that a relatively rare genetic predisposition causes some ... than normal -- possibly harming the infant,s central nervous ...
... at menopause as well as a woman,s breastfeeding practices ... breast cancer. That was the conclusion of a new ... CANCER, a peer-reviewed journal of the American ... distinct and separate hormonal risk factors associated with different ...
... Bikes Belong and Humana, launches Freewheelin ... bike-sharing initiative ... Inaugural Ride, DENVER, Aug. 24 Bike-sharing officially,rolled into Denver ... date: Freewheelin. Leading 100 cyclists,through the streets of Denver, Mayor Hickenlooper ...
... Benefit Group, LLC announces iCan Insurance, LLC ("iCan Insurance", "iCan") ... Inc. , ... Boca Raton, FL ... iCan Insurance, LLC ("iCan Insurance", "iCan") is now offering major ...
Cached Medicine News:Health News:Dragon Dream Team Continues to Send Message of Hope a Year Later 2Health News:Climate Change Linked to Longer Pollen Seasons 2Health News:Taking Codeine While Breast-Feeding May Harm Infant 2Health News:Taking Codeine While Breast-Feeding May Harm Infant 3Health News:Breastfeeding, other factors may affect risk of breast cancer type 2Health News:Kicking Into High Gear: Nation's Largest Bike-Sharing Program Debuts at Democratic National Convention 2Health News:Kicking Into High Gear: Nation's Largest Bike-Sharing Program Debuts at Democratic National Convention 3Health News:Kicking Into High Gear: Nation's Largest Bike-Sharing Program Debuts at Democratic National Convention 4Health News:iCan Benefit Group, LLC Announces: Major Medical Division Now Offers Avalon Healthcare Products 2
(Date:9/18/2014)... 18, 2014  A $3 million grant from The ... of Michigan to establish a national center of excellence ... for Aging Research at U-M will focus on exploiting ... the effects of aging and postpone diseases in animal ... can help develop medications that may help people live ...
(Date:9/18/2014)... NEWARK, N.J. , Sept. 18, 2014  Neurotrope, ... Larry D. Altstiel , M.D., Ph.D. to the Company,s ... of Dr. Altstiel fills a vacancy on the Board ... of the Nominating and Corporate Governance Committee and a ... Board.  He is also a member of Neurotrope,s Scientific Advisory ...
(Date:9/18/2014)... 2014  Spring Bank Pharmaceuticals, Inc., a clinical-stage ... of RNA viruses, today announced a research collaboration ... animal testing of the Company,s lead compound, SB ... Pathogens," against which currently there are no effective ... Bank,s proprietary Small Molecule Nucleic Acid Hybrid ...
Breaking Medicine Technology:$3 M grant funds Paul F. Glenn Center for Aging Research at the University of Michigan 2$3 M grant funds Paul F. Glenn Center for Aging Research at the University of Michigan 3Larry D. Altstiel, M.D., Ph.D. Joins Neurotrope Board of Directors 2Larry D. Altstiel, M.D., Ph.D. Joins Neurotrope Board of Directors 3Larry D. Altstiel, M.D., Ph.D. Joins Neurotrope Board of Directors 4Spring Bank Pharmaceuticals Announces NIH Collaboration for Testing of SB 9200 Against Multiple Viral Pathogens 2
... 2011 Booth # 407 at The American ... NxStage® Medical, Inc. (Nasdaq: NXTM ), ... announced that its Medisystems division has won a ... Solution to Atlantic Dialysis Management Services centers. ...
... Digital Assent, provider of the award-winning PatientPad® self-service ... it has opened offices in Los Angeles, Chicago and New ... rapid increase in demand for the PatientPad across the country ... of our major markets," said Andrew Ibbotson, president and CEO ...
Cached Medicine Technology:NxStage Awarded Multi-Year Contract to Supply Atlantic Dialysis Management Services with Vasc-Alert Access Surveillance Solution 2NxStage Awarded Multi-Year Contract to Supply Atlantic Dialysis Management Services with Vasc-Alert Access Surveillance Solution 3Digital Assent Opens Offices in Los Angeles, Chicago and New York 2
Battery-driven vacuum system operates with a touch of a button....
... The D.O.R.C. Harmony Special Peristaltic phacoemulsification ... latest technology including individual programmability and remote ... system features a front panel with color ... LCD display for ease of use and ...
... an advanced ophthalmic system that integrates ... allowing surgeons to independently select either ... procedures.,The key feature of this futuristic ... that measures in-line vacuum pressure, ensuring ...
The D.O.R.C. CryoStar is the smart cryosurgical system that combines optimal performance with state-of-the-art automation. simple for O.R. staff to operate and maintain throughout every procedure....
Medicine Products: