I want to know when the Auditiory nerve is created in the unborn baby
(fetus)during pregnancy (i.e at what week)

Hi, 

--"As noted, the brainstem matures in a caudal to rostral direction,
and the pons begins to emerge after the medulla, around the 8th week
of gestation. The maturation and myelination of the pons is more
prolonged than the medulla and does not reach advanced levels of
development until around the 7th month of gestation (Langworthy, 1937;
Yakovlev & Lecours, 1967). Hence, many of the functions associated
with the pons appear later in fetal development; i.e. around the 7th
month of gestation. As with the medulla, some functions appear in
advance of others and in an incomplete or irregular fashion.

For example, it has been reported that by the 26th week of gestation
the body of the fetus will reflexively react to vibration and
exceedingly loud auditory (110 db) stimulation 60% of the time,
whereas by 32 weeks the rate is over 80% (Kisilevsky, Muir & Low,
1992; Shahidullah & Hepper, 1993). At 29 weeks not only will the body
jerk, but the FHR will accelerate."
http://brainmind.com/FetalBrainDevelopment.html

That is from Brain and Mind dot com. A very interesting website to
keep in your research list. The title of the article is  FETAL BRAIN &
COGNITIVE DEVELOPMENT by Rhawn Joseph, Ph.D. -- Brain Research
Laboratory.

Not what I would consider an easy read, but it is packed with
information about the development of the brain, nerves and vital areas
of the fetus, and at what time periods these developments normally
happen.

Thanks, 

webadept-ga