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:3/4/2015)... March 04, 2015 Nurses, healthcare professionals ... American Cannabis Nurses Association (ACNA) to learn about why ... wide array of illnesses and conditions. The one-day continuing ... is being offered on April 1 or April 2 ... was approved by the Ohio Nurses Association (OBN-001-91), an ...
(Date:3/3/2015)... Anik Singal's Profit Academy - a ... has become the talk of the town throughout ... the course's general release has garnered the attention ... to review the program's content and publish an ... keys to success with Internet marketing is having ...
(Date:3/3/2015)... New York (PRWEB) March 03, 2015 ... tactics used to market the atypical antipsychotic medication ... U.S. According to court documents, the South Carolina ... finding that Johnson & Johnson’s Janssen Pharmaceuticals unit ... serious risks. However, while the Court’s February 25th ...
(Date:3/3/2015)... Longtime parent visionary and inspiring new ... Center for a candid interview on the surrogacy ... an exhilarating revelation of his magical surrogacy journey — ... Australia to the birth of his precious twin girls. ... CEO and Founder of CARE stated, “We are committed ...
(Date:3/3/2015)... 03, 2015 Man, Woman & Student ... help find cures and ensure access to treatments for ... for patents and their families. Through this annual national ... the fight for a world without blood cancers. The ... in the country, to be announced this summer. To ...
Breaking Medicine News(10 mins):Health News:American Cannabis Nurses Association Announces Speaker Lineup for Educational Seminar in Cleveland 2Health News:American Cannabis Nurses Association Announces Speaker Lineup for Educational Seminar in Cleveland 3Health News:Anik Singal's Profit Academy - Review Of New IM Training Program Released 2Health News:Risperdal Lawsuit News: Bernstein Liebhard LLP Comments on Ruling Upholding South Carolina Jury Decision in Risperdal Marketing Case 2Health News:Risperdal Lawsuit News: Bernstein Liebhard LLP Comments on Ruling Upholding South Carolina Jury Decision in Risperdal Marketing Case 3Health News:CARE Surrogacy Center Mexico Conducts Candid Interview with Australian Father of Twins 2Health News:CARE Surrogacy Center Mexico Conducts Candid Interview with Australian Father of Twins 3Health News:The Leukemia & Lymphoma Society’s Oregon and SW Washington Chapter Kicks Off Their Eleventh Annual Man, Woman & Student of the Year Campaign 2Health News:The Leukemia & Lymphoma Society’s Oregon and SW Washington Chapter Kicks Off Their Eleventh Annual Man, Woman & Student of the Year Campaign 3
... offer tips to avoid mowing-related hazards , SATURDAY, ... such a common summertime activity that many people forget ... warn. , Each year in the United States, about ... mower-related accidents, according to the U.S. Consumer Product Safety ...
... Nearly 600 Kidney-Friendly Recipes to Meet Kidney Care Needs for ... DaVita Inc. (NYSE: DVA ), a leading provider ... disease (CKD), offers fathers and their families the opportunity to ... nearly 600 kidney-friendly recipes available on DaVita.com ...
... visit Healthy Athletes Village and hand out awards , ... to catch Summer Games action at the University of ... Village today from 9:30-10 a.m. and will hand out awards ... Field. , , Healthy Athletes is an initiative designed ...
... D.C. The amount of time imaging equipment is ... rates President Obama and the Medicare Payment Advisory Commission ... according to data recently collected by the Radiology Business ... in radiology. The RBMA data, which consist ...
... -- Cell Therapeutics, Inc. (the "Company" or "CTI") (Nasdaq ... separate concurrent fixed price exchange offers (each, an "Exchange Offer" ... the approximately $118.9 million outstanding principal amount of five series ... expired at 5:00 p.m., New York City time, on Tuesday, ...
... Boston, MA -- As President Obama prepares to sign ... oversight of the tobacco industry, a new study from ... tobacco manufacturers have continually changed the ingredients and the ... changes have exceeded acceptable product variance guidelines. The result, ...
Cached Medicine News:Health News:Don't Get Lazy About Lawn-Mower Safety 2Health News:DaVita.com Provides Easy Recipes to Plan Your Father's Day Dinner 2Health News:DaVita.com Provides Easy Recipes to Plan Your Father's Day Dinner 3Health News:Last Day of Special Olympics Minnesota's 2009 Summer Games 2Health News:Last Day of Special Olympics Minnesota's 2009 Summer Games 3Health News:Data: Actual imaging use far below president's recommended 95 percent utilization rate for Medicare 2Health News:Data: Actual imaging use far below president's recommended 95 percent utilization rate for Medicare 3Health News:Data: Actual imaging use far below president's recommended 95 percent utilization rate for Medicare 4Health News:Cell Therapeutics Announces Final Results of its Fixed Price Exchange Offers for Any and All of its $118.9 Million Convertible Notes Outstanding 2Health News:Cell Therapeutics Announces Final Results of its Fixed Price Exchange Offers for Any and All of its $118.9 Million Convertible Notes Outstanding 3Health News:Study finds that tobacco companies changed design of cigarettes without alerting smokers 2
(Date:3/3/2015)... BETHESDA, Md. , March 3, 2015 /PRNewswire/-- ViaCyte, ... stem cell-derived islet replacement therapy for the treatment of ... Dr. Eugene Brandon , Director of Strategic Relations ... annual summit showcases the latest in type 1 diabetes ... presentation are as follows: , , , ...
(Date:3/3/2015)... SHANGHAI , March 3, 2015 ... 24 - 26 June 2015, SNIEC, Shanghai, China ... with the 10th P-MEC China, will be held at Shanghai ... CPhI & P-MEC China originated from CPhI Worldwide and was ... become an important bridge between Chinese pharmaceutical companies and global ...
(Date:3/3/2015)... - ChipCare Corporation, a University of Toronto start-up company ... other infectious and non-communicable diseases has closed a ... first-generation product to market while further developing the ... http://photos.prnewswire.com/prnh/20150303/179107 ) Insufficient access ... affordable diagnostic tests makes it difficult to provide ...
Breaking Medicine Technology:ViaCyte to Present at JDRF TypeOneNation Research Summit 215th Anniversary, Be Part of Chinese Pharma Dream 215th Anniversary, Be Part of Chinese Pharma Dream 3ChipCare Closes Oversubscribed $5 Million Series A Financing 2ChipCare Closes Oversubscribed $5 Million Series A Financing 3
... fiberoptic laryngoscope blade that can give that ... during difficult intubations. The articulating tip design ... be raised by squeezing a lever next ... a more complete exposure of the glottis, ...
... The FR-120F, Fujinon's new fiberoptic Naso-Pharyngo-Laryngoscope ... and patient comfort. The latest in ... an increased light guide, and a wide ... very impressive 3.3mm distal tip diameter. ...
... Articulating Tip Laryngoscopes are the ... Industry. The articulating tip aids ... an improved view of epiglottis. ... Optic styles. We guarantee your ...
CCR Medical fiberoptic green system laryngoscope handles., ,OUTSTANDING PERFORMANCE, QUALITY, AND PRICING MAKE OUR FIBEROPTIC SELECTION MOST ECONOMICAL....
Medicine Products: