a. The thenar space lies lateral to the lateral septum of the palmar aponeurosis which is attached to the middle metacarpal bone. Explanationsb. The hypothenar space lies medial to the medial septum of the palmar aponeurosis which is attached to the 5th metacarpal bone. c. The midpalmar space lies deep to the palmar aponeurosis between its medial and lateral septa. d. The pulp spaces lie over the palmar surfaces of the tips of the fingers.