Welcome to The Visible Embryo
  o
 
The Visible Embryo Home
   
Google  
Home--- -History-----Bibliography-----Pregnancy Timeline-----Prescription Drugs in Pregnancy---- Pregnancy Calculator----Female Reproductive System----News----Contact
 
Welcome to The Visible Embryo, a comprehensive educational resource on human development from conception to birth.

The Visible Embryo provides visual references for changes in fetal development throughout pregnancy and can be navigated via fetal development or maternal changes.

The National Institutes of Child Health and Human Development awarded Phase I and Phase II Small Business Innovative Research Grants to develop The Visible Embryo. Initally designed to evaluate the internet as a teaching tool for first year medical students, The Visible Embryo is linked to over 600 educational institutions and is viewed by more than one million visitors each month.

Today, The Visible Embryo is linked to over 600 educational institutions and is viewed by more than 1 million visitors each month. The field of early embryology has grown to include the identification of the stem cell as not only critical to organogenesis in the embryo, but equally critical to organ function and repair in the adult human. The identification and understanding of genetic malfunction, inflammatory responses, and the progression in chronic disease, begins with a grounding in primary cellular and systemic functions manifested in the study of the early embryo.

WHO International Clinical Trials Registry Platform


The World Health Organization (WHO) has created a new Web site to help researchers, doctors and patients obtain reliable information on high-quality clinical trials. Now you can go to one website and search all registers to identify clinical trial research underway around the world!





Home

History

Bibliography

Pregnancy Timeline

Prescription Drug Effects on Pregnancy

Pregnancy Calculator

Female Reproductive System

News

Disclaimer: The Visible Embryo web site is provided for your general information only. The information contained on this site should not be treated as a substitute for medical, legal or other professional advice. Neither is The Visible Embryo responsible or liable for the contents of any websites of third parties which are listed on this site.


Content protected under a Creative Commons License.
No dirivative works may be made or used for commercial purposes.

 

Pregnancy Timeline by SemestersDevelopmental TimelineFertilizationFirst TrimesterSecond TrimesterThird TrimesterFirst Thin Layer of Skin AppearsEnd of Embryonic PeriodEnd of Embryonic PeriodFemale Reproductive SystemBeginning Cerebral HemispheresA Four Chambered HeartFirst Detectable Brain WavesThe Appearance of SomitesBasic Brain Structure in PlaceHeartbeat can be detectedHeartbeat can be detectedFinger and toe prints appearFinger and toe prints appearFetal sexual organs visibleBrown fat surrounds lymphatic systemBone marrow starts making blood cellsBone marrow starts making blood cellsInner Ear Bones HardenSensory brain waves begin to activateSensory brain waves begin to activateFetal liver is producing blood cellsBrain convolutions beginBrain convolutions beginImmune system beginningWhite fat begins to be madeHead may position into pelvisWhite fat begins to be madePeriod of rapid brain growthFull TermHead may position into pelvisImmune system beginningLungs begin to produce surfactant
CLICK ON weeks 0 - 40 and follow along every 2 weeks of fetal development




 

Four studies explore memory decline with epilepsy

Four studies presented at the American Epilepsy Society's (AES) 69th Annual Meeting uncover biological factors that may indirectly cause memory decline in people with epilepsy. Particularly in patients with seizures affecting their temporal lobe.


Loss of neurons from the hippocampus, a brain region that processes and stores memories, is a common cause of temporal lobe epilepsy.

People with temporal epilepsy caused by hippocampal sclerosis (TLE-HS) have impaired memory and find it particularly challenging to recall details of specific events in everyday life.

In the first study, (abstract 2.326) researchers from the University of São Paulo report that patients with TLE-HS have everyday dramatic memory deficits that may not be detected via traditional neuropsychological tests. Noting the inconsistency between neuropsychological test results, and patient complaints of memory loss in everyday life, the researchers set out to generate a more realistic picture of memory performance in these patients.

Comparisons of cognitive performance in 30 people with TLE-HS and 27 age- and gender-matched healthy participants revealed that patients with TLE-HS were less likely to recall the names of unfamiliar people, or even of places where personal items were stored, and difficulty with detailed stories. Patients with TLE-HS also had difficulty orienting themselves in time and space.

The authors further report that cognitive performance was significantly lower in patients with poor seizure control and those taking multiple antiepileptic drugs.


"We found that patients with TLE-HS had deficits in everyday memory functions, including significant impairments in daily activities that are not evaluated in a standard neuropsychological evaluation.

"These impairments can make it difficult for patients to socially adapt and should receive greater attention in the neuropsychological evaluation of patients with memory complaints.

"Everyday memory evaluation does not replace the traditional neuropsychological tests, but adds valuable information regarding memory complaints and guides rehabilitation."


Kette Valente MD, PhD, Professor, Laboratory of Clinical Neurophysiology, University of São Paulo Medical School.


In a second study (abstract 3.312) researchers from the Federal University of São Paulo show that reduced cell density in certain parts of the hippocampus may be linked to deficits in short- and long-term memory in certain patients with TLE-HS.

The researchers evaluated memory and language in 72 patients with TLE-HS who were undergoing pre-operative evaluation, then examined samples of brain tissue that were removed from the hippocampus during epilepsy surgery.

They report that performance on all elements of neuropsychological tests was worse in patients with degeneration on the right side of the hippocampus compared with the left side.


"Despite the fact that the literature describes only correlation between verbal memory tests and hippocampal cell densities in patients with left hippocampal sclerosis, we found a correlation between right hippocampal cell densities and performance on visual memory tests, including both immediate and delayed recall."

Sandra Mara Comper and Anaclara Prada Jardim, students, Dr. Elza Marcia Yacubian laboratory, Federal University of São Paulo.


A third study (abstract 3.244) finds that large brain function networks are affected by focal forms of epilepsy.

Researchers from the National Autonomous University of Mexico, the General Hospital of Mexico and Centro Estatal de Salud Mental (CESAM), Queretaro studied patients with temporal lobe epilepsy and healthy participants, using fMRI to monitor brain activity in the cerebral cortex while the groups completed an activity known as Sternberg's task, which assesses working memory.

The brain activity was then analyzed along with participants' performance on a neuropsychological evaluation. The groups exhibited similar brain activity despite the observation that patients with epilepsy required significantly longer times to complete the task, and in epilepsy patients (but not in control patients) there were specific brain regions that showed a direct relation between their level of activity and the patient's cognitive performance.

"Our results show that while patients have relatively small deficits in working memory, the activity of the cortical networks that support such a function are predictive of their performance," says author Vicente Camacho, M.D., and a Masters student at the National Autonomous University of Mexico.


A fourth study finds that a generalized seizure leads to diminished short and long-term memory by interfering with key signaling pathways in the brain.

It is well known that seizures produce learning, memory and behavioral deficits, and that they trigger abnormally high activity of two signaling pathways in the brain: the phosphoinositide 3-kinase (PI3K) and mechanistic target of rapamycin (mTOR) cascades.

But whether abnormal signaling is to blame for these deficits remains unclear.


Researchers from the Baylor College of Medicine and the Gordon and Mary Cain Foundation Laboratories explored the effects of seizure activity on short- and long-term memory in a rat model of epilepsy.

They also tested whether learning and memory deficits could be corrected using drugs that calm the overactive signaling cascades.

They report that signaling activity remained high 3 hours after a seizure, but returned to normal levels within 24 hours. Seizures induced significant deficits in short as well as long-term memory. The memory deficits that could be partially corrected using the drug wortmannin, which inhibits PI3K and mTOR.


"Studies are underway to reveal how seizures affect various types of memory and to explore the associated molecular signaling and morphological alterations affected."

Angela Carter, author and a predoctoral fellow in the laboratory of Dr. Anne Anderson at the Baylor College of Medicine.


American Epilepsy Society (AES) 69th Annual Meeting
The American Epilepsy Society is a medical and scientific society whose members are engaged in research and clinical care for people with epilepsy. For more than 75 years, AES has provided a dynamic global forum where professionals from academia, private practice, not-for-profit, government and industry can learn, share and grow. Find out more at aesnet.org.

Return to top of page

Dec 9, 2015   Fetal Timeline   Maternal Timeline   News   News Archive   



In a fourth study presented at the American Epilepsy Society's (AES) 69th Annual Meeting
reseachers find that a generalized seizure leads to diminished short and long-term memory
by interfering with key signaling pathways in the brain.

Image Credit: What Causes Epilepsy? (Epilepsy #5)




 





 


 

 

 

 

 

 

 

 

Phospholid by Wikipedia