help to my sentence ( to or of )

If you apply pressure distal to a wound, you apply pressure to the part of the body adjacent to the wound which is further from the centre of the body. The word 'to' is the right preposition to use.

ok but what is the mean of '' to '' ?
for example; as you said
If you apply pressure distal '' to '' a wound
If you apply pressure distal '' of '' a wound ???

what is the different ? likewise.....

Incise soft tissue distal '' to ''the desired intervertebral space.
Incise soft tissue distal '' of '' the desired intervertebral space. ???

make a double V incision in the skin distal '' to '' the desired site.
make a double V incision in the skin distal '' of '' the desired site. ???

how should i think ?? i cant understand '' to ''..

The word 'to' is a preposition. A preposition is a word used to link nouns, pronouns, or phrases to other words within a sentence. Prepositions are usually short words, and they are normally placed directly in front of nouns. To is a preposition used to express movement toward a place or location relative to a place. Distal to a wound, proximal to a wound. The hand is distal to the shoulder. The thumb is distal to the wrist. The elbow is distal to the shoulder but proximal to the wrist. The The knee is proximal to the foot but distal to the hip.

thank you very much i understand. but why havent they used '' of '' in this sentences ? for example :

The hand is distal '' of '' the shoulder ??
The hand ( which is ) distal '' of '' the shoulder
( not ''to'' )

We can use prepositions 'of', 'with', 'to' after adjectives. Distal and proximal happen to be two adjectives that are followed by 'to'. Some other examples: married/engaged, nice / kind / good / generous to someone, mean / impolite / rude / unpleasant / unfriendly / cruel to someone, similar to something.