Uploading fotos from camera internal memory to laptop?

I have taken few snaps using my NIKON camera and since i don't have memory card, it is saved in camera memory itself. Now, i don't know how to upload the fotos in the laptop.

Since you don't have any memory card, you need a camera-USB cord. Usually, they come with the camera, if you don't have one, just search your camera model accessories and you should be able to buy one. Once you connect it to the computer turn on the camera and a list of import options should come up on the screen depending on what type of laptop you have. Hope this helps!

The manual gives you step by step instructions
using the usb cord

You didn't say which Nikon you had but I assume they all work pretty much the same way. I had this problem and my usb port was damaged. I discovered I could copy the internal pictures to my SD card.

Go to your menu, look for copy, and see if you have an option to save from internal to SD. It will have symbols not words but if there are no pictures on your SD card than it'll be the only one highlighted.
After you do that just take the SD card out and put that in a thumb drive and then put in the USB port in your computer. Unless you have the USB cable that comes with the camera which can go directly from camera to computer. I don't have that option any longer.