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Date: 3-1-2017
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Date: 11-1-2017
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Date: 11-1-2017
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Extraepithelial Glands-Holocrine Sebaceous Glands
Sebaceous glands consist of bulbous multilayered epithelium cones, termed sebaceous bulbs or sacs, which lack a luminal space. The neck of the main bulb opens to the hair shaft. The cells inside the bulb grow larger, produce sebum and consequently, change into sebum cells 2 . Their nuclei then die ( apoptosis). In the usual preparations use d for teaching purposes, the fat droplets are removed. This leads to more and more vacuoles in the cells at the center. While producing the secretory product , the cells die and are extrude d together with the secretory material (sebum): holocrine extrusion, holocytosis, (cell lysis). New cells arrive from a supply line, which start at the peripheral cell layer (substitute cells, basal cells) 3 .
1 Sebum in the neck of the gland
2 Sebaceous gland cells
3 Peripheral cells (substitute cells, basal cells)
4 Dense regular connective tissue
Stain: azan; magnification: × 65
References
Kuehnel, W.(2003). Color Atlas of Cytology, Histology, and Microscopic Anatomy. 4th edition . Institute of Anatomy Universitätzu Luebeck Luebeck, Germany . Thieme Stuttgar t · New York .
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