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Microscopical Identification of Crude Drugs & Cell Contents | Morphological Groups & Structures

Learn about the microscopical identification of drugs based on morphological groups such as barks, leaves, roots, and seeds. Understand the types of epidermis cells and stomata for precise drug recognition.

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Microscopical Identification of Crude Drugs & Cell Contents | Morphological Groups & Structures

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  1. MICROSCOPICAL IDENTIFICATION OF CRUDE DRUGS AND CELL CONTENTS

  2. For convenience of study , drugs may be arranged not only according to families and chemical constituents but into morphological groups as barks , roots , leaves, seeds or in another word drugs can be arranged into organized and non organized drugs .

  3. Epidermis Single layer of cells covering the whole plant, the structure of the epidermis and stomata are of first important in the microscopically identification of leaves Types of epidermis cells 1- Ordinary epidermis cell 2- Guard cell 3- Subsidiary cell

  4. Types of stomata 1- Anomocytic stomata: cells resembling the other epidermal cells may surround stomata for example: Digitalispurpurea leaves.

  5. 2- Anisocytic stomata with the stomata surrounded by 3 or 4 subsidiary cells one of which is markedly smaller than the other. For example: Hyoscymusniger and Atropabelladonna leaves.

  6. 3- Paracytic stomata with 2 subsidiary cells with their long axis parallel to the pore for example: senna leaves

  7. 4- Diacytic stomata with 2 subsidiary cells with their long axis at right angles to the pore of the stomata for example: Mentha piperita

  8. 5- Actinocytic stomata subsidiary cells are arranged along the radii of the circle for example: Pilocarpusjaborandi leaves.

  9. EpidermalTrichomes Most leaves, stems, flowers, fruits and seeds possess Trichomes of one kind or anther. Functions of Trichomes: 1- Physical and chemical protection of the leaf against insect and microbial. 2- Secretion (perfume)

  10. Types of Trichomes: 1-Covering Trichomes (non-glandular) a- unicellular b- multicellular – unbranched c- multicellular – branched

  11. A- Unicellular stalk a- unicellular head 2-Glandular Trichomes b- bicellular head c- Multicellular head

  12. B- multicellular- uniseriate stalk a- unicellular head b- Multicellular head

  13. C- Multicellular –multiseriate stalk -- Multicellular head

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