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- Anteriorly, it is bounded by the posterior edge of the sternocleidomastoid muscle.
- Posteriorly, it is bounded by the anterior edge of trapezius muscle.
- Inferiorly it is bounded by the clavicle.
The floor of the triangle is made up of deep investing fascia which covers prevertebal muscles. The roof is formed by skin, platysma muscle, and fascia which spans between the trapezius and sternocleidomastoid muscles.
Links and References:
Grant's: 8.1
Netter:21