Transverse ridge is prominent on occlusal surface of which of the following deciduous teeth?
**Core Concept**
A transverse ridge is a characteristic anatomical feature on the occlusal surface of deciduous teeth, which is a remnant of the tooth's development and morphology. The presence and prominence of a transverse ridge can be used to identify specific teeth in dental anatomy.
**Why the Correct Answer is Right**
The transverse ridge is most commonly observed on the occlusal surface of the first molars, where it represents a remnant of the tooth's lingual cingulum. The presence of a transverse ridge is a distinguishing feature of the first molar, allowing for its identification in dental anatomy. The lingual cingulum is a ridge of enamel that runs along the lingual surface of the tooth, and in the case of the first molar, it extends onto the occlusal surface as a transverse ridge.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the transverse ridge is not a characteristic feature of the second molars. While second molars do have a lingual cingulum, it does not typically extend onto the occlusal surface as a prominent transverse ridge.
**Option B:** This option is incorrect because the transverse ridge is not typically observed on the occlusal surface of the incisors. The incisors have a smooth occlusal surface, with no prominent ridges or features.
**Option C:** This option is incorrect because the transverse ridge is not a characteristic feature of the canines. While the canines do have a distinctive shape and morphology, they do not typically have a prominent transverse ridge on the occlusal surface.
**Clinical Pearl / High-Yield Fact**
One important note about the transverse ridge is that it can be used as a distinguishing feature to identify the first molars in dental anatomy. This is particularly useful in situations where the teeth are partially erupted or obscured, and the presence of a transverse ridge can help to confirm the identity of the tooth.
**Correct Answer:** C. First molar.