Keichu Nape of the neck. Koken Wrist joint, or bent wrist. It translates as 'arc fist'. Komekami The temple area of the head. Also see kasumi.
Te is on the end to signify that it is of the hand.
Ko means arc. In some cases you will see kote as forearm as in 'omote-kote' or 'outer forearm' Kubi Neck. The outside edge of the top of the foot. Kyobu Chest area. Mata Top of the thigh.