12. 下列何者並非枕下三角(suboccipital region)的邊界？
(A)後小頭直肌(rectus capitis posterior minor muscle)
(B)頭下斜肌(inferior oblique muscle)
(C)頭上斜肌(superior oblique muscle)
(D)頭半棘肌(semispinalis capitis)

枕下三角 (Suboccipital t...