Podcast
Questions and Answers
What type of muscle primarily composes the lips?
What type of muscle primarily composes the lips?
Which part of the lip is devoid of sweat and sebaceous glands?
Which part of the lip is devoid of sweat and sebaceous glands?
What is the primary function of the complex arrangement of striated muscles in the tongue?
What is the primary function of the complex arrangement of striated muscles in the tongue?
Where is the sulcus terminalis located on the tongue?
Where is the sulcus terminalis located on the tongue?
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What characterizes the red line (vermilion) of the lips?
What characterizes the red line (vermilion) of the lips?
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Study Notes
Oral Region: Lips
- Lips are composed of orbicularis oris muscle, dense fibroelastic connective tissue.
- Outer lip surface covered by hairy skin, with sebaceous and sweat glands.
- Inner lip surface lined by oral mucosa; underlying connective tissue contains mucous labial glands.
- The red line (vermilion) is a transition zone between skin and oral mucosa; it's hairless, very thin, and vascular (showing red color of blood capillaries); highly sensitive due to rich sensory innervation.
- Lip margin lacks sweat and sebaceous glands, requiring continuous moistening (e.g., saliva) to prevent cracking.
Oral Region: Tongue
- The tongue is a mobile muscular organ.
- Striated muscles are arranged vertically, horizontally, and longitudinally, intersecting at right angles.
- Muscle arrangement ensures high mobility for mastication, phonation, and swallowing.
- Anterior two-thirds and posterior one-third of tongue have different embryonic origins.
- The boundary between these two sections forms a shallow V-shaped groove (sulcus terminalis) with the apex pointing posteriorly.
- Tongue's dorsal and ventral surfaces are covered by oral mucosa.
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Description
Explore the intricate anatomy of the lips and tongue, essential components of the oral region. This quiz covers muscle structure, connective tissue, sensory innervation, and the distinct zones of the lips and tongue. Test your knowledge of their functions and anatomical features.
