Anatomy of the calf (posterior leg)

I've got a sore calf from too much running on tarmac. Let's have a look at the anatomical structures in the posterior leg (calf) and work out what's going on. There are 2 layers of muscles, a superficial vein and nerve to look at, and a neuromuscular bundle between the muscle layers.

Help me with my charity 100km run:
https://www.justgiving.com/fundraisin...


Daily Anatomy App:

For a random human anatomy question every day on your phone you can get my Daily Anatomy question app from the Apple App Store:

https://itunes.apple.com/gb/app/daily...

or Google Play Store:

https://play.google.com/store/apps/de...

Music by Broke For Free
Album: Petal
Song: Summer Spliffs
https://brokeforfree.bandcamp.com