Which point is posterior to the ear, in a small depression two thirds of the distance along a curved line drawn from Yifeng SJ-17 to Jiaosun SJ-20 following the line of the rim of the ear?

Which point is posterior to the ear, in a small depression two thirds of the distance along a curved line drawn from Yifeng SJ-17 to Jiaosun SJ-20 following the line of the rim of the ear?

• A. SJ 20
• B. SJ 18
• C. SJ 19
• D. SJ 22

Answer: (C)

Locating points around the ear uses the curved path along the rim of the ear. Starting at Yifeng behind the earlobe and moving toward Jiaosun at the ear margin, the San Jiao channel follows that arc. About two-thirds along this curve, you reach a small depression behind the ear, which is San Jiao 19. This position is clearly posterior to the ear, fitting the description, while the other nearby points lie at different parts of the ear region or on the rim itself.

Locating points around the ear uses the curved path along the rim of the ear. Starting at Yifeng behind the earlobe and moving toward Jiaosun at the ear margin, the San Jiao channel follows that arc. About two-thirds along this curve, you reach a small depression behind the ear, which is San Jiao 19. This position is clearly posterior to the ear, fitting the description, while the other nearby points lie at different parts of the ear region or on the rim itself.