Last prelab

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Last prelab

  1. 1. BENGHAZI UNIVERSITY FACULTY OF MEDICINE DEPARTMENT OF HISTOLOGY FIRST YEAR MEDICAL PRELAB PART III Prepared by: Dr. Hala El.Alam. Dr. Manal Eljerby. Dr. Lobna Alferjani.1
  2. 2. Prelab 9Nervous tissue I
  3. 3. Slides of lab 9 ..1. Multipolar nerve cells in spinal cord. X402. Pyramidal nerve cells in cerebral cortex. X403. Pyriform nerve cells in cerebellum . X404. Astrocyte. X40
  4. 4. 1.Multipolar nerve cells in spinal cord 1. Cell body (perikarion) : Pyramidal in shape . 2. nucleus : Prominent nucleolus . 3. Single axon . 4. Multiple dendrites .
  5. 5. 1.Multipolar nerve cells in spinal cord
  6. 6. Multipolar nerve cells in spinal cord x40
  7. 7. 2.Pyriform nerve cells in cerebellum.1. Called Purkinji cells.2. Multipolar cell.3. Arranged in raw between granular & molecular layer .4. Flask shaped cell bodies .5. One axon &many branched dendrites
  8. 8. 2.Pyriform nerve cells in cerebellum.
  9. 9. Pyriform nerve cells in cerebellum X40 Molecular layer Granular layer
  10. 10. 3.Pyramidal nerve cells in cerebral cortex X401. Large pyramidal cell body.2. Large vesicular nucleus.3. Multiple dendrites .
  11. 11. 3.Pyramidal nerve cells in cerebral cortex X40
  12. 12. 4.Astrocyte1. Star shaped cell body.2. Large nucleus.3. Stained black with silver.4. Numerous long branched processes end with feet like expansions on blood vessels.
  13. 13. 4.Astrocyte Astrocyte
  14. 14. Astrocyte × 40.
  15. 15. Prelab 10Nervous tissue II
  16. 16. Slides of prelab 10 ..1. Oligodendrocyte . X402. Spinal ganglion . X403. Sympathetic ganglion . X404. Ependyma . X405. Nerve trunk . X40
  17. 17. 1. Oligodendrocyte ..1.small cell body .2. few processes .3. large dark nucleus .4. form myelin sheaths in CNS .
  18. 18. Oligodendrocyte .. X40 Cell body Dendrites
  19. 19. 2&3 Spinal & sympathetic ganglion Spinal ganglion Sympathetic ganglion1. Contain Pseudounipolar neurons. 1. Multipolar neurons.2. Large with central nucleus. 2. Small numerous with eccentric3. In groups. nucleus.4. Completely surrounded by satellite 3. Scattered. cells. 4. Have few less prominent5. Separated by thick myelinated satellite cells. fibers. 5. Separated by Unmyelinated6. Oval shape ,Thick capsule. nerve cells.7. They are present beside spinal cord in both sides . 6. Round shape ,Thin capsule. 7. Related to autonomic nervous
  20. 20. Spinal & sympathetic ganglion Sympathetic ganglionSpinal ganglion
  21. 21. 2.Spinal ganglion … X40 C.T capsulePseudounipolar N. Stellate cells Myelinated n. fibers
  22. 22. Spinal ganglion X100Pseudounipolar neuron Central nucleus&prominent nucleolus . Stellate cells .
  23. 23. Spinal ganglion X40
  24. 24. 3.Sympathetic ganglion… X40 Multipolar N .Unmyelinated N. fibers
  25. 25. 4.Ependyma ..1.single layer of simple cuboidal epithelium .2. lines the ventricles of brain & central canal of spinal cord .3.Ciliated and non ciliated .
  26. 26. 4.Ependyma ..
  27. 27. Ependyma x40 Cilia
  28. 28. 5.Nerve trunk ..1.. Nerves are surrounded by epineurium .2. Each bundle (or fascicle) of nerve fibers is surrounded by perineurium .3. Each nerve fiber within each bundle is individually surrounded by endoneurium
  29. 29. 5.Nerve trunk ..
  30. 30. Nerve trunk .. X40 Perineurium Endoneurium Nerve axon
  31. 31. Prelab 12Lymphatic tissue
  32. 32. Slides of prelab1. Thymus gland . X40.2. Lymph node . X40.3. Spleen . X40.4. Palatine tonsils . X40.5. Payers patches . X40.
  33. 33. Thymus Hassall corpuscle
  34. 34. Thymusa- Capsule and septa of C.T tissueb- Cortex and medullac- Medulla contains Hassalls corpuscles
  35. 35. Lymph node• C.T capsule and Trabeculae• b- Cortex : lymphatic nodules with germinal center• c- Medulla : Medullary cords and sinuses.
  36. 36. Lymph node
  37. 37. cortex Medulla
  38. 38. Spleen• a - C.T capsule and Trabeculae• b- White pulp ( lymphatic nodules & central artery)• c-Red pulp (splenic cord and splenic venous sinuses)
  39. 39. Spleen
  40. 40. Spleen
  41. 41. Spleen
  42. 42. White pulp1. Lymphatic nodule with germinal center.2. Central artery .
  43. 43. Palatine Tonsils• Tonsillar crypts.• Lymphatic nodules• Stratified nonkeratinized epithelial covering.
  44. 44. Palatine Tonsils• Tonsillar crypts.• Lymphatic nodules• Stratified nonkeratinized epithelial covering.
  45. 45. Palatine Tonsils
  46. 46. Palatine TonsilLymphatic nodules Mucus glands Crypt Epithelium
  47. 47. Peyer`s Patches• Are aggregations of lymphatic nodules.• Located in the lamina propria of the wall of the ileum opposite to the mesentery.
  48. 48. Payer’s Patch
  49. 49. Payer’s Patch
  50. 50. Prelab 13 Skin
  51. 51. Slides for the prelab• 1. thick skin x10• 2. thin skin x10• 3. hair follicle ( cross section) x40• 4.negroid skin x40.
  52. 52. Thick skin1.In palms & soles.2 Keratinized stratified squamous epithelium.3.Thick epidermis.4.Many sweat gland.5.No hair or sebaceous gland.
  53. 53. Thick Skin
  54. 54. Thin skin1- Epidermis : thin.2- Dermis :thick3- Stratified squamous Keratinized epithelium4- Hair follicles5- Sebaceous and sweat glands
  55. 55. Thin skin
  56. 56. epithelium Thin skinErrector Pillae muscleSebaceous glandHair follicleSweat gland
  57. 57. Thin skin x10
  58. 58. Thin skin x10
  59. 59. Hair follicle (cross section)1.Cortex2.medulla3. inner & outer root sheet.4.connective tissue sheet.
  60. 60. Hair follicle (cross section) x40
  61. 61. Negroid skin1. Stratified squamous Keratinized epithelium.2. Melanin pigment
  62. 62. Negroid skin X40
  63. 63. Negroid skin X40
  64. 64. Thick Skin Thin SkinSite Palms & soles Whole body except palms and solesEpidermis Thicker ThinnerHair follicles & Absent Presentsebaceous glandspapillary ridges Characteristic Not characteristic. (finger prints)
  65. 65. Prelab 14Vascular system
  66. 66. Slides of this lab• 1. aorta (as an example of large artery).• 2.inferior vena cava(as an example of large vein)• 3.medium sized artery& vein.
  67. 67. Aorta1- Tunica intima: endothelium and subedotheliumconnective tissue.2.internal elastic lamina.3- Tunica media: thick, mainly of elastic fiber withsmooth muscle cells.4- Tunica adventitia: Thin and is composed ofloose fibroelastic connective tissue, contain vasavasorum.
  68. 68. Aorta
  69. 69. aorta
  70. 70. Veins (Inferior vena cava)1.Tunica intima: Thin, endothelium andsubedothelium.2.Tunica media: Thin and contain fewsmooth muscle fiber.3.Tunic adventitia: Thickest of the threetunicas, contains coarse collagen fibers,elastic fibers and longitudinal bundles ofsmooth muscle.4. no internal or external elastic lamina
  71. 71. Inferior vena cava
  72. 72. Inferior vena cava
  73. 73. Medium sized artery Medium sized vein wall Thick with narrow Thin with wide lumen lumen. Tunica intima thick folded with thin internal elastic laminaTunica media thick, formed of Thin, thin and circularly arranged formed of smooth smooth muscles muscle cells separated by Collagenous fibers, and few elastic connective tissue Tunica adventitia thin thickInternal elastic Well developed absentlamina External elastic May be present absent lamina
  74. 74. Medium sized artery and vein

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