Please think a little more about what it is you need to know,
then ask the question in way that it can be answered.
Radius
Yes, pronation refers to lying face-down, or facing the palm downward.
Any explanation always starts with the body in anatomical position. The hands/forearms are supine (palm facing up like you're holding a cup of soup). This would make the pinky (and ulnar bone) medial with the thumb (and radius bone) lateral. At the elbow joint there is a lateral and medial epicondyle (a projection of the humerus where the forearm extensor and flexor muscles attach respectively). For lateral and medial positions this only really affects the forearm/hand since everything else is straightforward.
Wax Palm
I beleive a palm savanna is an open, grassland-type, ecosystem where there are many scattered palm trees. For example, a Bismarckia palm savanna is found in Madagascar.
The palm is up in the anatomical position. This is also when the forearm is supinated.
In the anatomical position of the hand the palm faces to anterior side. Because you use your palm as you flex it. You do not use the dorsal aspect of the hand normally. So in the anatomical position the palm faces on the anterior side. That way the thumb comes on lateral side to the fingers.
In the anatomical position of the hand the palm faces to anterior side. Because you use your palm as you flex it. You do not use the dorsal aspect of the hand normally. So in the anatomical position the palm faces on the anterior side. That way the thumb comes on lateral side to the fingers.
supination
Supination.
In the anatomical position of the hand the palm is facing forward. The thumb is placed in contact with the index finger. You can see the picture of the anatomical position. It is better to see than describe the same.
The ventral or anterior aspect of the foot is located on the bottom of the foot. Think of it as the palm of the hand is the ventral/anterior part of the hand in anatomical position to help you remember.
Plane
The carpals are the small bones in the wrist. --Not to be confused with the metacarpals, which are the longer bones in the palm of your hand. -Lib
Radius
Turning the palm backward or downward is called pronation. This movement involves rotation of the forearm so that the palm faces downward or backward.
pronation