12 下列何者構成坐骨肛門窩（ischioanal fossa）的內側壁？

臀中肌 提肛肌梨狀肌閉孔內肌

B

	ANTERIOR * fascia of Colles covering the Transversus perinei superficialis * inferior fascia of the urogenital diaphragm
LATERAL * tuberosity of the ischium * Obturator internus muscle * obturator fascia	SUPERIOR: * Levator ani INFERIOR: * skin	MEDIAL: * Levator ani * Sphincter ani externus * anal fascia
	POSTERIOR * Gluteus maximus * sacrotuberous ligament