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Related Concept Videos

Assessment of the Mouth01:26

Assessment of the Mouth

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A thorough mouth assessment, including inspection and palpation of the lips, gums, tongue, tonsils, uvula, and pharynx, is crucial in detecting potential health issues. Diseases ranging from oral cancer to systemic conditions like diabetes could be identified early through careful oral examination. This article provides a detailed guide on conducting a comprehensive mouth assessment.
Mouth Inspection
The inspection begins with visually examining the mouth for symmetry, color, and size.
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Oral Cavity01:11

Oral Cavity

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The oral cavity, or the mouth, is a complex structure in humans that plays a vital role in our day-to-day lives. Its role is not only in chewing and swallowing food; it also plays a role in speech and facial expressions.
Teeth: The teeth are the hardest structures in our bodies. Humans have two sets of teeth throughout their lifetime: deciduous (baby) teeth and permanent teeth. Each tooth consists of several parts: the crown (visible part), the root (embedded in the jaw), enamel (hard outer...
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The Tongue and Taste Buds00:49

The Tongue and Taste Buds

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The surface of the tongue is covered with various small bumps called papillae, which either distribute what has been ingested (filiform papillae) or contain the sensory taste (or gustatory) receptor cells (fungiform, circumvallate, and foliate papillae). Embedded within each taste-related papilla are the taste buds—clusters of 30 to 100 gustatory receptor cells.
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Teeth01:15

Teeth

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The formation of teeth, also known as odontogenesis, is a complex process that begins in utero, around the sixth week of embryonic development. There are three stages to this process: the bud stage, the cap stage, and the bell stage.
In the bud stage, the tooth germ (an aggregation of cells) starts to form in the developing jawbone. During the cap stage, the tooth germ differentiates into enamel organ, dental papilla, and dental sac, which will later develop into the tooth's enamel, dentin...
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Tongue01:01

Tongue

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The human tongue is a fascinating and complex organ, responsible for various essential functions such as swallowing, speech, and taste. It is also subject to various conditions and diseases. In this article, we delve into the anatomy of the tongue, its roles, and some common conditions that can affect it.
Anatomical Position in the Oral Cavity
The tongue is located within the oral cavity, also known as the mouth. It is attached to the floor of the mouth by a fold of mucous membrane called the...
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Salivary Glands and Saliva01:23

Salivary Glands and Saliva

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The salivary glands, of which there are three pairs known as the parotid, submandibular, and sublingual glands, play a crucial role in maintaining oral health and initiating the digestive process. Positioned near the ears, beneath the masseter muscle, the parotid glands secrete saliva into the oral cavity through the parotid duct of Stensen. Meanwhile, the submandibular glands, located on the floor of the mouth, secrete saliva through channels named submandibular ducts. The sublingual glands,...
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Related Experiment Video

Updated: Mar 2, 2026

Taste Exam: A Brief and Validated Test
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Taste Exam: A Brief and Validated Test

Published on: August 17, 2018

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Mouth development.

Justin Chen1,2, Laura A Jacox1,3,4, Francesca Saldanha1

  • 1Whitehead Institute for Biomedical Research, Cambridge, MA, USA.

Wiley Interdisciplinary Reviews. Developmental Biology
|May 18, 2017
PubMed
Summary
This summary is machine-generated.

The animal mouth evolved once, forming from ectoderm and endoderm through a conserved gene program. Vertebrate mouth development involves precise steps, including neural crest interactions, in models like Xenopus.

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Related Experiment Videos

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Area of Science:

  • Developmental Biology
  • Evolutionary Biology
  • Genetics

Background:

  • The mouth is a universal animal feature, initiating the digestive tract and enabling feeding.
  • Understanding mouth formation provides insights into fundamental biological processes and evolutionary history.

Purpose of the Study:

  • To review the evolutionary origins and developmental mechanisms of mouth formation.
  • To explore conserved genetic programs and specific vertebrate developmental steps.

Main Methods:

  • Review of existing literature on animal mouth evolution and development.
  • Focus on gene expression patterns and developmental processes in model organisms, particularly Xenopus.

Main Results:

  • Evidence suggests a single evolutionary origin for the mouth, conserved across diverse animal groups.
  • A conserved 'mouth gene program' involving genes like foxA and otx2 supports a monophyletic origin.
  • Vertebrate mouth formation involves precise sequential steps, including the interaction between the extreme anterior domain (EAD) and cranial neural crest (NC).

Conclusions:

  • The mouth evolved once, with conserved genetic and developmental pathways.
  • Vertebrate mouth development is a complex process guided by specific signaling interactions, with implications for understanding human congenital anomalies.