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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Flashcards
What covers the outer and inner surfaces of the lip?
What covers the outer and inner surfaces of the lip?
The outer surface of the lip is covered by hairy skin with hair follicles, sebaceous and sweat glands, while the inner surface is lined by oral mucosa.
What is the vermilion border?
What is the vermilion border?
The red line (vermilion) is a transition zone between the epidermis of skin and oral mucosa; it is devoid of sweat and sebaceous glands, and requires continuous moistening by saliva to prevent cracking.
Describe the muscle structure of the tongue.
Describe the muscle structure of the tongue.
The tongue is a highly mobile muscular organ made up of striated muscles arranged vertically, horizontally, and longitudinally, intersecting at right angles.
What is the sulcus terminalis?
What is the sulcus terminalis?
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What are the surfaces and covering of the tongue?
What are the surfaces and covering of the tongue?
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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.