This facial groove is inferior to the lower part of the mucous membrane and superior to the mental eminence. A. Angulus oris eminence B. Angulus oris sulci C. Nasolabial sulcus D. Labiomental sulcus

Human Anatomy & Physiology (11th Edition)
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Author:Elaine N. Marieb, Katja N. Hoehn
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Chapter1: The Human Body: An Orientation
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This facial groove is inferior to the lower part of the mucous membrane and superior to the mental eminence.

A. Angulus oris eminence

B. Angulus oris sulci

C. Nasolabial sulcus

D. Labiomental sulcus 

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The facial skeleton refers to the part of the axial skeleton which marks the facial region of the skull that is accommodated by facial muscles, orbit cavity, nasal cavity, and the opening of the oral cavity. Specialized anatomical markings can be spotted on the bony surface of the facial skeleton as well as the external surface of the face. These markings are usually called facial markings and are defined by various special features, processes, grooves present on the facial skeleton. The iconic grooves present are referred to as facial grooves.

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