The muscles of the hand are principally concerned, as regards surface form, in producing the thenar and hypothenar eminences, and cannot be individually distinguished; the thenar eminence, on the radial side, is larger and rounder than the hypothenar, which is a long narrow elevation along the ulnar side of the palm.    From Wordnik.com.  [XII. Surface Anatomy and Surface Markings. 11. Surface Anatomy of the Upper Extremity] Reference

They drain into a venous plexus which is situated over the thenar and hypothenar eminences and across the front of the wrist.    From Wordnik.com.  [VII. The Veins. 3c. The Veins of the Upper Extremity and Thorax] Reference

When the Palmaris brevis is in action it produces a wrinkling of the skin over the hypothenar eminence and a dimple on the ulnar border.    From Wordnik.com.  [XII. Surface Anatomy and Surface Markings. 11. Surface Anatomy of the Upper Extremity] Reference

Wasting of the thenar and hypothenar eminences, and filling up of the hollows above and below the anterior annular ligament, render the appearance on the palmar aspect characteristic.    From Wordnik.com.  [Manual of Surgery Volume Second: Extremities—Head—Neck. Sixth Edition.] Reference

While an assistant draws up the skin as much as possible, the surgeon makes an accurate circular incision through the skin, about an inch below the styloid processes, just grazing the thenar and hypothenar eminences.    From Wordnik.com.  [A Manual of the Operations of Surgery For the Use of Senior Students, House Surgeons, and Junior Practitioners] Reference

The muscles of the hand are subdivided into three groups: (1) those of the thumb, which occupy the radial side and produce the thenar eminence; (2) those of the little finger, which occupy the ulnar side and give rise to the hypothenar eminence; (3) those in the middle of the palm and between the metacarpal bones.    From Wordnik.com.  [IV. Myology. 1F. The Muscles and Fasciæ of the Hand] Reference