Podcast
Questions and Answers
Which artery predominantly supplies the superficial palmar arch?
Which artery predominantly supplies the superficial palmar arch?
The radial artery is the primary supply for the medial side of the hand.
The radial artery is the primary supply for the medial side of the hand.
False
What are the two main arteries that supply blood to the hand?
What are the two main arteries that supply blood to the hand?
Radial artery and ulnar artery
The deep palmar arch is primarily formed by the ______ artery.
The deep palmar arch is primarily formed by the ______ artery.
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What histological feature is characteristic of squamous cell carcinoma?
What histological feature is characteristic of squamous cell carcinoma?
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Which condition is signified by a dense infiltrate of plasma cells in histological examination?
Which condition is signified by a dense infiltrate of plasma cells in histological examination?
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What mechanism underlies spongiosis observed in multiple pruritic plaques?
What mechanism underlies spongiosis observed in multiple pruritic plaques?
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In which condition is acantholysis, or loss of keratinocyte attachment, predominantly seen?
In which condition is acantholysis, or loss of keratinocyte attachment, predominantly seen?
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Which condition is typically characterized by target lesions and often triggered by infection?
Which condition is typically characterized by target lesions and often triggered by infection?
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What type of carcinoma is often associated with significant sun exposure and shows keratin pearls histologically?
What type of carcinoma is often associated with significant sun exposure and shows keratin pearls histologically?
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Which condition is NOT associated with a plasma cell infiltrate?
Which condition is NOT associated with a plasma cell infiltrate?
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What is the primary underlying mechanism of allergic contact dermatitis?
What is the primary underlying mechanism of allergic contact dermatitis?
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What can be inferred about a lesion with target lesions following HSV infection?
What can be inferred about a lesion with target lesions following HSV infection?
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Which skin lesion would most likely present with erythematous and scaly features?
Which skin lesion would most likely present with erythematous and scaly features?
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Study Notes
Blood Supply of the Hand
- The radial and ulnar arteries are the primary blood supply to the hand.
- The radial and ulnar arteries form two interconnected arches: the superficial palmar arch and the deep palmar arch.
- The superficial palmar arch is mainly supplied by the ulnar artery, with contributions from the radial. It supplies the fingers through common palmar digital arteries, which then split into proper palmar digital arteries.
- The deep palmar arch is primarily formed by the radial artery, with a contribution from the ulnar artery. It supplies the palmar metacarpal arteries and provides deeper blood supply to the hand muscles and bones.
- The interconnected arches create an anastomotic network which ensures collateral blood flow to the hand and fingers even if one artery is compromised.
- The medial hand (little finger side) is mainly supplied by the ulnar artery.
- The lateral hand (thumb side) is primarily supplied by the radial artery, which branches into the princeps pollicis (thumb) and radialis indicis (index finger) arteries.
- The radial artery is a major contributor to the deep palmer arch.
Squamous Cell Carcinoma
- Keratin pearls are a hallmark of squamous cell carcinoma.
- UV exposure is a common risk factor for this condition.
- Actinic damage often preceeds the development of this carcinoma.
Erythema Multiforme
- Target lesions are characteristic of erythema multiforme.
- Herpes simplex virus (HSV) infection is a frequent trigger.
- Drug reactions can also cause erythema multiforme.
Plasma Cell Dyscrasia
- Dense infiltrate of plasma cells on histological examination points to a plasma cell disorder.
- Multiple myeloma is a common example of a plasma cell dyscrasia.
- Other plasma cell abnormalities can also display significant plasma cell accumulation.
Acantholysis
- Loss of attachment between keratinocytes is termed acantholysis.
- Pemphigus vulgaris is a condition associated with acantholysis.
- Autoimmune response against desmosomes underlies acantholysis in pemphigus vulgaris.
Type 4 Hypersensitivity
- Eczematous dermatitis is mediated by type 4 hypersensitivity.
- Spongiosis refers to intercellular edema in the epidermis.
- Allergic contact dermatitis is a common cause of eczematous dermatitis.
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Description
This quiz explores the complex blood supply system of the hand, focusing on the roles of the radial and ulnar arteries. Learn about the superficial and deep palmar arches and their connections which ensure a reliable blood flow. Test your knowledge on the anatomical features and functions related to hand circulation.
