Triangular microliths may be isosceles, scalene or equilateral. The structure is composed by triangles ranging from scalene to equilateral. A scalenohedron is topologically identical to a 2"n"-bipyramid, but contains congruent scalene triangles. The phyllic disphenoid similarly has faces with two shapes of scalene triangles. Behind the posterior groove is a rough area for the attachment of the medial scalene. For buttress threads, the triangle is scalene. The posterior scalene, () is the smallest and most deeply seated of the scalene muscles. These structures become encroached upon by the cervical rib and scalene muscles. It has three sets of edge lengths, and scalene triangle faces. The scalene muscles have an important relationship to other structures in the neck. In a review, botox was compared to a placebo injected into the scalene muscles. The middle scalene, (), is the largest and longest of the three scalene muscles. Koboi is responsible for the death of Commander Root and General Scalene.