Study of rats brains indicates brain continues to grow after puberty

CHAMPAIGN, Ill. -- A simple study of rat brains has added more substance to the idea that the adult brain is still a work in progress, even well after puberty, say University of Illinois researchers. While overall size may not change, the composition of nerve fibers in a key area does.

The scientists looked at the cellular makeup in the splenium, the thick, round, back portion of the rat corpus callosum, a mass that connects the two hemispheres of the brain, at 60, 120 and 180 days of age. Well after puberty's onset at about 40 days, axons (nerve fibers) continued to be wrapped by myelin -- white matter that both insulates axons and speeds the transmission of impulses between neurons. The number of unmyelinated axons decreased at the same time presumably because they are turned into myelinated axons.

The study -- reported in the March 16 issue of Developmental Brain Research -- was the first demonstration "that the area occupied by myelinated axons increases until 180 days of age" and likely beyond in the rat. There had been indication in the literature that myelination continues in adult cats.

"People have thought that myelination stopped during development, probably at about age 12," said Janice M. Juraska, a neuroscientist and professor of psychology at the UI. "This study is part of a rethinking on the growth of the brain. It is becoming clear that the corpus callosum changes in size at later ages than previously believed."

By 120 days of age (about in the mid-20s in humans), the area analyzed appeared to have stabilized in the amount of blood vessels and glial cells, but there was a significant decrease in the area occupied by unmyelinated axons and glial bodies. "An increase specifically in splenial myelination in the adult rat may lead to increases in the amount of visual information transferred between the hemispheres," the researchers wrote.

Axons that have not become myelinated can exchange communication signals with each other, b

Contact: Jim Barlow, Life Sciences Editor
University of Illinois at Urbana-Champaign

Page: 1 2

Related biology news :

1. Study: Emission of smog ingredients from trees is increasing rapidly
2. Study explores gene transfer to modify underlying course of Alzheimers disease
3. Study reveals why eyes in some paintings seem to follow viewers
4. Study by Israeli scientists provides insight on DNA code
5. Study reveals first genetic step necessary for prostate cancer growth
6. Study of flu patients reveals virus outsmarting key drug
7. Study in Science reveals recreational fishing takes big bite of ocean catch
8. Study suggests cell-cycle triggers might be cancer drug targets
9. Study narrows search for genes placing men at increased risk for prostate cancer
10. Study links high carbohydrate diet to increased breast cancer risk
11. Study explains spatial orientation differences between sexes

Post Your Comments:

(Date:7/2/2020)... REDWOOD CITY, Calif. (PRWEB) , ... July 01, ... ... stage biotech company, presented its phase 1a findings of Neihulizumab, a biologic for ... annual conference in June 2020. Led by hemato-oncologist Dr. Paul J Martin of ...
(Date:6/28/2020)... Fla. (PRWEB) , ... June 25, 2020 , ... In ... focus on innovations in accelerated Point of Care Testing solutions (POCT). Check local listings ... Samples are collected at medical offices and are shipped to labs throughout the country. ...
(Date:6/23/2020)... ... June 23, 2020 , ... ... pleased to announce the next event in a series of TOPIQ webinars, which ... TOPIQ series of webinars was developed in response to social distancing measures that ...
Breaking Biology News(10 mins):
(Date:7/31/2020)... Ariz. (PRWEB) , ... July 29, 2020 , ... R3 ... joint injections for only $3950. With 50 million stem cells total, patients may choose ... stem cell therapy works for arthritic joints (BMC Musculoskelet Disord. 2016). At R3 International, ...
(Date:7/31/2020)... ... July 29, 2020 , ... Editas Medicine, Inc. ... of advanced delivery technologies, development, and manufacturing solutions for drugs, biologics, cell and ... a strategic partnership whereby Catalent will provide support for the development, manufacturing, and ...
(Date:7/22/2020)... ... , ... Join experts from Reed Tech , Gary Saner, Sr. Manager, ... hour live webinar on Thursday, August 13, 2020 at 11am EDT (4pm ... devices. Specifically, for medical devices, the NMPA has departments dealing with medical device registration ...
(Date:7/18/2020)... ... July 17, 2020 , ... dicentra , ... sciences and food industries, is pleased to announce that Charles Galea has joined ... Development. , Charles is an accomplished and results-driven sales executive with over 10 ...
Breaking Biology Technology:
Cached News: