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. 4^th edition . Institute of Anatomy Universitätzu Luebeck Luebeck, Germany . Thieme Stuttgar t · New York .

مواضيع ذات صلة

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الرايبوسومات Ribosomes

Ameboid Movement

The Mitochondria Extract Energy From Nutrients

Synthesis of Cellular Structures by Endoplasmic Reticulum and Golgi Apparatus

Ingestion by the Cell—Endocytosis

Comparison of The Animal Cell with Precellular Forms of Life

Cell Cytoskeleton—Filament and Tubular Structures

Mitochondria

Endoplasmic Reticulum

Cell Membrane

Organization of the Cell