what structures are found in the oropharynx
1 The oral cavity and oropharynx are spaces defined by both hard and soft tissue structures. 2  The oral cavity has muscle and bony boundaries, but the pharynx is a muscular tube.3  An embryologic/evolutionary definition is useful for understanding the impact of birth defects.ey Points. 1  The oral cavity and oropharynx are spaces defined by both hard and soft tissue structures. 2  The oral cavity has muscle and bony boundaries, but the pharynx is a muscular tube. 3  An embryologic/evolutionary definition is useful for understanding the impact of birth defects.