顶 roof is formed by the: EE Floor is formed by the: 皮肤skin 椎前筋膜 Prevertebral fascia 浅筋膜 Superficial fascia 椎前肌 Prevertrbral musc|es 封套筋膜 vesting fascia 斜角肌 Scalene muscles顶roof is formed by the: 皮肤skin 浅筋膜Superficial fascia 封套筋膜Investing fascia 底 Floor is formed by the： 椎前筋膜Prevertebral fascia 椎前肌Prevertrbral muscles 斜角肌Scalene muscles