Podcast
Questions and Answers
Which tissue type predominantly constitutes the papillary dermis?
Which tissue type predominantly constitutes the papillary dermis?
- Areolar connective tissue (correct)
- Adipose tissue
- Dense regular connective tissue
- Reticular connective tissue
What is the primary function of dermal papillae?
What is the primary function of dermal papillae?
- To facilitate the exchange of materials between the dermis and epidermis (correct)
- To provide structural support for the epidermis with thick collagen bundles
- To store fat cells within the dermis
- To produce sweat for thermoregulation
How do epidermal ridges enhance the function of the hands and feet?
How do epidermal ridges enhance the function of the hands and feet?
- By increasing friction and gripping ability (correct)
- By increasing the rate of sweat production
- By reducing the surface area for grip
- By providing a smooth surface for sensation
Why are fingerprints often referred to as 'sweat films'?
Why are fingerprints often referred to as 'sweat films'?
Which of the following best describes the relationship between the epidermis and the underlying dermis?
Which of the following best describes the relationship between the epidermis and the underlying dermis?
Flashcards
Papillary Dermis
Papillary Dermis
The superficial layer of the dermis, made of areolar connective tissue with thin collagen and elastic fibers.
Dermal Papillae
Dermal Papillae
Finger-like projections of the papillary dermis that extend into the epidermis.
Dermal-Epidermal Junction
Dermal-Epidermal Junction
The junction between the epidermis and dermis is strengthened by these interdigitations, reducing blister formation.
Dermal Ridges
Dermal Ridges
Signup and view all the flashcards
Epidermal Ridges
Epidermal Ridges
Signup and view all the flashcards
Study Notes
Papillary Dermis
- The papillary dermis, the top 20% of the dermis, is areolar connective tissue with thin collagen and elastic fibers.
- Dermal papillae, finger-like projections, extend into the epidermis.
- These projections increase the surface area for exchange of gases, nutrients, and waste between the dermis and epidermis.
- The epidermis is avascular, relying on diffusion from the dermis.
- Interdigitation strengthens the dermal-epidermal junction, reducing blister formation.
Dermal Ridges and Epidermal Ridges
- On palms and soles, dermal papillae sit atop dermal ridges.
- These ridges elevate the epidermis into epidermal ridges (friction ridges).
- Friction ridges create fingerprints, palmprints, and footprints.
- Epidermal ridges increase friction and improve gripping.
- Ridge patterns are unique and genetically determined to each person.
- Sweat pores on the ridge crests leave distinct fingerprints.
- Fingerprints are essentially "sweat films."
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
