Flashcards on Angiosome Theory and Vascular Territories
Angiosome Theory and Vascular Territories: A Student's Guide
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Vascular Supply of the Skin and Perfusion
60 cards
Card 1
Question: What is the total number of perforators in the human body, and what is their percentage distribution into direct and indirect perforators?
Answer: Approximately 400 perforators; ~40% are direct and ~60% are indirect perforators.
Card 2
Question: Where do direct cutaneous perforators typically pass through the deep fascia?
Answer: Direct perforators pierce the deep fascia where it is attached to bone or intermuscular/intramuscular septa — this corresponds to fixed skin areas.
Card 3
Question: What difference in course and branching do smaller versus larger vessels show in the subcutis towards the skin?
Answer: Smaller vessels course vertically towards the skin; larger ones branch in a stellate pattern or run in a specific direction parallel to the skin surfa
Card 4
Question: How does the course of larger direct vessels differ in the scalp and limbs, where the skin is firmly attached to the deep fascia?
Answer: Larger vessels 'adhere' to the fascial surface and pass within the loose areolar layer between the fascia and subcutaneous fat for a considerable dist
Card 5
Question: What forms the subdermal plexus, and what role do large direct perforators play in it?
Answer: The subdermal plexus is a rich network of vessels beneath the skin; large direct perforators emerge through the subcutaneous layer and ascend within t
Card 6
Question: How do the density and size of direct perforators differ in various body regions (head/trunk/limbs vs. hands/feet)?
Answer: On the head, neck, trunk, arm, and thigh, perforators are larger, longer, and less numerous. On the forearm, calf, and dorsum of the hands/feet, they
Card 7
Question: What are 'avalvular' or oscillating veins, and what is their function in venous drainage?
Answer: Avalvular (valveless) veins allow bidirectional flow between venous territories; they equalize flow and enable connections between veins with opposing
Card 8
Question: How are vascular networks arranged in deep tissues (muscles, tendon, nerve, bone) in relation to cutaneous territories?
Answer: In deep tissues, a similar 3D network of vessels connects vascular territories; the perimeters of these territories are joined by 'choke' arteries, wh
Card 9
Question: What is the relationship between direct perforators and subcutaneous fat in loose skin areas of the body?
Answer: In loose areas, direct vessels run parallel to the deep fascia but are intimately connected to the underlying subcutaneous fat by a thin fascial layer
Card 10
Question: How does a plexus form in close proximity to the surface of the deep fascia, and what branches contribute to it?
Answer: This plexus is formed by the branching of direct perforators as they pierce the deep fascia, and by the connection of these branches with smaller indi