According to Montagna and Parakkal (1974), there are fewer cross-shunts above the keratogenous zone of the follicle near the hair bulb than in the upper portion of the hair follicle. Cross-shunts also form a network at the location of the sebaceous gland (sebaceous isthmus), which they envelop in tight nets that adhere to sebaceous acini. Above the entrance of the sebaceous duct, parallel vessels form a loose network that rises up to the loops of capillaries in the papillary body. Returning to the base of the follicle, some vessels penetrate the dermal papilla and the tufts.
KeywordsHair Follicle Sebaceous Gland Dermal Papilla Mesenchymal Tissue Apocrine Gland
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