Changes

*The paranasal sinuses are a series of cavities arranged one after another.

*The paranasal sinuses are a series of cavities arranged one after another.

*All species have ''Frontal'' and ''Maxillary'' systems

*All species have ''Frontal'' and ''Maxillary'' systems

**Frontal: consists of space(s) within the bones between the cranial cavity and the nasal cavity

**Frontal: consists of space(s) within the bones between the cranial cavity and the [[Nasal cavity - Anatomy & Physiology|nasal cavity]].

**Maxillary: this is the largest sinus, and consists of the space within the caudolateral part of the upper jaw, above the caudal cheek teeth. This increases with age due to wearing and ventral relocation of the teeth.

**Maxillary: this is the largest sinus, and consists of the space within the caudolateral part of the upper jaw, above the caudal cheek [[Oral Cavity - Teeth & Gingiva - Anatomy & Physiology|teeth]]. This increases with age due to wearing and ventral relocation of the [[Oral Cavity - Teeth & Gingiva - Anatomy & Physiology|teeth]].

 

==Function==

==Function==

The function of paranasal sinuses is somewhat ambiguous, however they are likely to have the following evolutionary purposes:

The function of paranasal sinuses is somewhat ambiguous, however they are likely to have the following evolutionary purposes: