Brain & Nerve Facts

The adult human brain weighs about 3 pounds (1,300-1,400 g).

The adult human brain is about 2% of the total body weight.

The elephant brain weighs about 6,000 g.

The cat brain weighs about 30 g.

The average human brain is 140 mm wide.

The average human brain is 167 mm long.

The average human brain is 93 mm high.

The human brain has about 100,000,000,000 (100 billion) neurons.

The octopus brain has about 300 million neurons.

The total surface area of the cerebral cortex is about 2500 sq. cm (~2.5 ft²)

The world record for time without sleep is 264 hours (11 days) by Randy Gardner in 1965. Note: In Biopsychology (by J.P.J. Pinel, Boston: Allyn and Bacon, 2000, p. 322), the record for time awake is attributed to Mrs. Maureen Weston. She apparently spent 449 hours (18 days, 17 hours) awake in a rocking chair. The Guinness Book of World Records [1990] has the record belonging to Robert McDonald who spent 453 hours, 40 min in a rocking chair.

Unconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.

Neurons multiply at a rate 250,000 neurons/minute during early pregnancy.

The weight of an adult human cerebellum is 150 g.

The total volume of cerebrospinal fluid (CSF) is 125-150 ml.

A total of 400-500 ml of cerebrospinal fluid (CSF) is produced every day.

Cerebrospinal fluid is normally clear and colorless.

There are 12 pairs of cranial nerves.

There are 31 pairs of spinal nerves.

There are about 13,500,00 neurons in the human spinal cord.

The human spinal cord is 45 cm long in men and 43 cm long in women.

Humans can hear in the range of 20 Hz to 20,000 Hz.

Rats can hear in the range of 1,000 to 50,000 Hz.

The most sensitive range of human hearing is between 1,000-4,000 Hz.

Pain occurs when sounds are above 130 db.

Hearing damage can occur if people are exposed to sounds above 90 db for an extended period of time.

The total number of human taste buds (tongue, palate, cheeks) is about 10,000.

The total number of human olfactory receptor cells is about 40 million.

The human eyeball is about 24.5 mm long.

The octopus does not have a blind spot.

The total weight of skin in an average adult human is 6 lb.(2.7 kg).

There are 1,000 to 10,000 synapses for a "typical" neuron.

The cell bodies of neurons vary in diameter from 4 microns (granule cell) to 100 microns (motor neuron in cord).

The resting potential in a squid giant axon is -70 mV.

Meningioma Surgery in Medan (May 16, 2007)

I had been in Medan since May 15, 2007.
Prof. A had another tumor surgery, so I brought Selector with me.
The flight was alright, I used Sriwijaya Air.
This time I went alone. Boss wouldn’t permit Arie to come along, well…it’s OK, I can manage. I’m always the strong girl

MAY 15, 2007

The work:

Delivered Selector to hospital and explained to O.R. nurses how to assemble and disassemble the handpiece. It’s important because I won’t have a colleague to help me. I needed them to be my help.

MAY 16, 2007

The work:

Arrived in the hospital at 10 am because the nurse informed me surgery will be at 11 am. Then I found out, schedule has changed, it would be at 1 pm. Waited for 3 hours. Surgery started at 2 pm, finished 5.30 pm.

Meningioma was so big, it was 1/4 of the brain. It was very big, Prof. A used his finger to separate it from the brain. No need to use Selector!

The tumor!

Wow, that was my first experience seeing that kind of procedure.

Hmmm, a request from him: I to stay with Selector because he’d have another tumor surgery on Friday. Oh God! How should I tell Ms. S from MK Hospital? Damn!

Asked my boss’ approval for this. I needed his help to contact Dr.J!

This also meant I had to re-schedule my flight.

For the rest of my trip, read here.