Stratum spinosum

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Histologic image showing a section of epidermis. Stratum spinosum labeled slightly below center. Epidermal layers.png
Histologic image showing a section of epidermis. Stratum spinosum labeled slightly below center.

The stratum spinosum (or spinous layer/prickle cell layer) [1] is a layer of the epidermis found between the stratum granulosum and stratum basale. [2] This layer is composed of polyhedral keratinocytes. [3] [4] These are joined with desmosomes. [3] Their spiny (Latin, spinosum) appearance is due to shrinking of the microfilaments between desmosomes that occurs when stained with H&E. Keratinization begins in the stratum spinosum, [5] although the actual keratinocytes begin in the stratum basale. [4] They have large pale-staining nuclei as they are active in synthesizing fibrillar proteins, known as cytokeratin, which build up within the cells aggregating together forming tonofibrils. The tonofibrils go on to form the desmosomes, which allow for strong connections to form between adjacent keratinocytes. The stratum spinosum also contains Langerhans cells, which functions as a macrophage by engulfing bacteria, foreign particles, and damaged cells that occur in this layer. [6] [7] [8]

Contents

Clinical significance

Diffuse hyperplasia of the stratum spinosum is termed acanthosis.[ citation needed ]

Additional images

See also

References

  1. ↑ Rook, Arthur; Burns, Tony (2004). Rook's textbook of dermatology. Blackwell Science. pp. 3.7 –3.8. ISBN   978-0-632-06429-8. OCLC   55097298.
  2. ↑ James, William D; Berger, Timothy G; Elston, Dirk M; Odom, Richard B (2006). Andrews' diseases of the skin: clinical dermatology. Saunders Elsevier. p. 2. ISBN   978-0-7216-2921-6. OCLC   62736861.
  3. 1 2 Barbieri, J.S.; Wanat, K.; Seykora, J. (2014). "Skin: Basic Structure and Function". Pathobiology of Human Disease. pp. 1134–1144. doi:10.1016/b978-0-12-386456-7.03501-2. ISBN   978-0-12-386457-4.
  4. 1 2 McBain, A.J.; o'Neill, C.A.; Oates, A. (2016). "Skin Microbiology". Reference Module in Biomedical Sciences. doi:10.1016/b978-0-12-801238-3.99217-1. ISBN   978-0-12-801238-3.
  5. ↑ Marks, James G; Lookingbill, Donald P (2006). Lookingbill and Marks' principles of dermatology. Saunders Elsevier. p. 6. ISBN   978-1-4160-3185-7. OCLC   70829704.
  6. ↑ Young, Barbara; Heath, John W; Stevens, Alan; Lowe, J S; Wheater, Paul R; Burkitt, H. George (2000). Wheater's functional histology: a text and colour atlas. Churchill Livingstone. ISBN   978-0-443-05612-3. OCLC   43051605.[ page needed ]
  7. ↑ Di Meglio, Paola; Conrad, Curdin (2016). "Psoriasis, Cutaneous Lupus Erithematosus and Immunobiology of the Skin". Encyclopedia of Immunobiology. pp. 192–203. doi:10.1016/b978-0-12-374279-7.15008-8. ISBN   978-0-08-092152-5.
  8. ↑ Creative Commons by small.svg  This article incorporates text available under the CC BY 4.0 license.Betts, J Gordon; Desaix, Peter; Johnson, Eddie; Johnson, Jody E; Korol, Oksana; Kruse, Dean; Poe, Brandon; Wise, James; Womble, Mark D; Young, Kelly A (June 28, 2023). Anatomy & Physiology. Houston: OpenStax CNX. 5.1 Layers of the skin. ISBN   978-1-947172-04-3.
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