Yes you can study nerve systems
I believe the answer is the second one!
Hope this helps!
dsnjflkdsfjldksfjklsjfkdsjfdklsjfdslfjdskljvfbkljcvxkljxzvmsfcvdnsfdojsfkljvxcnvxcvldjsfljdsfkljdsfldjsfdxvcmn,vxcncvxxcvvncxxcvnmncxvnoijsaji;jgoihnojuhjuihjuidrgfhuijhfdsoihfdoruewh,bvxc,bhdshfdsaohfasifhdishfdskdshfdhsfklkdshc,xvmxcvcvxbmnxcvbvjdsbvibdsbljbfkjkjbbkjavbkjdsakjsfbdsfkhdskjdsbfvkdsbkjdsbvbdskjbdskfbdskjdsbvfdkbvdffdkjbdksbfdsafkljbdsfljdbkgfbnfldbaskfbdsfdasbfkdljsbdfbfdsbfkjdsfkljdsfkbhdkjsbdsfkdsfkdhfskdjfbdasfkjfkjdskdskhfdlskdfskjdskfdjfhdshfdkshewurebvkvuiaeswghifoghdsdhjslhfldsfdsvnrnenrengffngnfdsgdfsgdfshdhgfhs
The great saphenous vein (or GSV).
