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21 fall: histology > lab 9 lymph > Flashcards

lab 9 lymph Flashcards

1
Q

Clustered lymphatic nodules composing a Peyer’s patch are present in the lamina propria and/or submucosa at one side of the ___ .

A

Ileum

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2
Q

Germinal centers

A

some nodules have central pale areas due to the presence of lymphocytes with paler nuclei and larger amounts of cytoplasm.

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3
Q

The rim of small lymphocytes surrounding the germinal center is called the ___ or ___ of the nodule.

A

corona

marginal zone

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4
Q

Nodules in the Peyer’s patch are partly encapsulated by ___

A

ense irregular connective tissue.

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5
Q

Tonsils lie deep to the ____ that lines the oral cavity and pharynx.

A

stratified squamous epithelium

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6
Q

The surface over the tonsil may be smooth or it may form deep invaginations called ____

A

crypts

horse have crypts, carnivore do not

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7
Q

___ have crypts, carnivore do not

A

horse

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8
Q

___ are collections of nodules and diffuse lymphatic tissue in the sub-epithelial connective tissue.

A

tonsils

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9
Q

The entire tonsil of a dog, lies within a fossa, and is covered in part by a ____

A

semilunar fold

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10
Q

____ are extensions of the dense connective tissue of the capsule that dip into the interior

A

trabeculae

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11
Q

B cell areas

A

nodules

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12
Q

T cell areas

A

deep cortical lymphatic tissue

paracortex

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13
Q

densely cellular extensions of cortical tissue

A

medullary cords

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14
Q

Medullary ___ are crossed by many fine strands of pink cytoplasm representing the branches of reticular cells - the fibroblastic cells that form the meshwork in most lymphatic tissue.

A

sinuses

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15
Q

Macrophages often contain ____, a golden-brown pigment resulting from the breakdown of red blood cells.

A

hemosiderin

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16
Q

____ are peculiar lymphatic organs found in some species, especially in ruminants.

A

hemal nodes

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17
Q

Hemal nodes are similar in architecture to lymph nodes but are supplied with___

A

blood vessels

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18
Q

hemal nodes

A

ruminants.

similar to lymph nodes

supplied with blood vessels and lack lymphatic vessels.

encapsulated and have a subcapsular sinus.

Nodular and diffuse lymphatic tissue is surrounded by blood-filled communicating sinuses in a meshwork of cells that are probably smooth muscle cells.

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19
Q

In the spleen, ____ is blue/purple because it is composed of lymphocytes that take up hematoxylin

A

White pulp

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20
Q

in the spleen, Trabecular ___ have a distinct wall, whereas trabecular ___ are endothelial-line tunnels within the trabecular substance.

A

arteries

veins

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21
Q

In the horse, cat and dog, the capsule and trabeculae are largely composed of ___ cells which can relax and allow the spleen to fill with blood and contract and expel the stored blood back into the circulation.

A

smooth muscle

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22
Q

white pulp in the spleen is oriented around ___

A

central arteries

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23
Q

PALS

A

periarterial lymphatic sheaths

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24
Q

PALS is found where and what is inside

A

around the central arteries of the white pulp of the spleen

T cells and DC cells

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25
Q

the border of the white and red pulp of the spleen is called the

A

marginal zone

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26
Q

periarterial macrophage sheaths

A

ellipsoids

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27
Q

ellipsoids are found in the

A

marginal zone or red pulp of the spleen

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28
Q

___, these sheaths of macrophages form large pale nodules around red pulp arterioles that may be confused with cross sections of trabeculae.

A

ellipsoids (periarterial macrophage sheaths)

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29
Q

The thymus is surrounded by a thin capsule of connective tissue from which extend ___ that divide the gland into irregular ____

A

septa

lobules.

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30
Q

Each lobule has an outer more darkly stained area containing small lymphocytes called the ___ and an inner ____ containing fewer and larger lymphocytes.

A

cortex

medulla

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31
Q

pink laminated whorls of epithelial reticular cells in the medulla of the thymus

A

Hassal’s (thymic) corpuscles

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32
Q

why are there no nodules in the thymus?

A

nodules are for B cells. no B cells in thymus,

Thymus is where T cells grow up

33
Q

saclike, oval, dorsal diverticulum of the wall of the proctodeum, a part of the bird’s cloaca.

A

Bursa of Fabricius,

34
Q

The lumen of the Bursa of Fabricius is lined by ___

A

pseudostratified columnar epithelium.

35
Q

Make up of Busra of Fabricius

A

lumen is lined by pseudostratified columnar epithelium.

Deep to the epithelium, thick layer of lymphatic tissue, divided into polyhedral lobules (follicles) by connective tissue septa.

Each lobule has a cortex and medulla.

The epithelium and underlying lymphatic tissue form folds that extend into the lumen of the bursa. As in the thymus, the meshwork supporting the lymphocytes in the bursa is formed by epithelial cells.

There is a capillary which separates the medulla from the cortex. It can be identified by the nucleated red blood cells within it.

36
Q

In the Bursa of Fabricius, deep to the epithelium lies a thick layer of ___. This tissue is divided into ____ by connective tissue septa.

A 
lymphatic tissue.
polyhedral lobules (follicles)
37
Q

In the Bursa of Fabricius, there is a ____ which separates the medulla from the cortex.

A

capillary

38
Q

Birds do not have ____ but lymphatic nodules are scattered throughout and are especially frequent beneath the epithelium of the digestive and respiratory tracts.

A

lymph nodes

39
Q

In birds, the thymus is similar to that in mammals but the ___ is different.

A

spleen

40
Q

In birds, the distinction between___ and ___pulp is not as clear as in mammalian spleens

A

red and white

41
Q

In birds, ____ is seen as irregularly shaped collections of lymphocytes in which there are several small arteries each bearing a small pink collar representing a periarterial reticular sheath.

A

White pulp

42
Q

In bird spleens, ____ is very cellular (reticular cells, macrophages, lymphocytes and red blood cells); venous sinuses are also present in the red pulp. Several large arteries and veins can be seen but ___ are not present.

A

red pulp

trabeculae

42
Q

In bird spleens, ____ is very cellular (reticular cells, macrophages, lymphocytes and red blood cells); venous sinuses are also present in the red pulp. Several large arteries and veins can be seen but ___ are not present.

A

red pulp

trabeculae

43
Q
A

peyer’s patch

44
Q
A

horse and dog tonsil

45
Q
A

hemal node

46
Q
A

spleen of cat

47
Q
A

avian spleen

48
Q
A

Peyer’s Patch

  1. Lymphatic nodule
  2. Germinal center
  3. Corona
  4. Diffuse lymphatic tissue
  5. Mucosa and the Peyer’s patches that extend into submucosa
  6. Ileal submucosa
  7. Muscularis externa
49
Q
A

Equine Tonsil

  1. Stratified squamous epithelium
  2. Crypt
  3. Nodules
  4. Diffuse lymphatic tissue
  5. Mucous salivary gland
50
Q
A

Palatine Tonsil

  1. Nodule
  2. Diffuse lymphatic tissue
  3. Mixed salivary glands
  4. Semilunar fold
51
Q
A

Lymph node

  1. Dense connective tissue capsule
  2. Dense connective tissue trabeculae
  3. Cortex
    3a. Cortical nodules with germinal centers
    3b. Paracortex
  4. Medulla
    4a. Medullary cords
    4b. Medullary sinus
  5. Subcapsular sinus
52
Q
A

lymph node cortex

  1. Paracortex
  2. Cortical nodules
  3. Germinal center within a cortical nodule
  4. Corona or marginal zone
  5. Subcapsular sinus
  6. Dense connective tissue capsule
53
Q
A

Lymph node medulla

  1. Medullary cord
  2. Medullary sinus
  3. Blood vessels
54
Q
A

Hemal Node

  1. Capsule
  2. Lymphatic nodule
  3. Diffuse lymphatic tissue
  4. Medullary sinus filled with blood
55
Q

hemal node

A
  1. Capsule
  2. Cortex
  3. Medulla
  4. Nodule
  5. Diffuse lymphatic tissue
  6. Medullary sinus filled with blood
56
Q
A

Contracted Spleen

  1. Capsule
  2. Red pulp
  3. White pulp
  4. Trabeculae
  5. Blood vessel within trabeculae
57
Q
A

Spleen

  1. Red pulp
  2. White pulp
  3. Edge of the folicle
  4. Center of the folicle
  5. Central arteriole surrounded by the periarteriolar lymphatic sheath (PALS)
  6. Macrophage sheathed capillaries (ellipsoids)
  7. Marginal zone
58
Q
A

Spleen

  1. Macrophage sheathed capillaries (ellipsoids)
  2. Red pulp
  3. Trabeculae
59
Q
A

blood filled spleen

  1. Capsule
  2. Red pulp
  3. White pulp
  4. Trabeculae
60
Q
A

Thymus

  1. Thymic lobule
  2. Cortex
  3. Medulla
  4. Capsule
  5. Trabeculae
61
Q
A

Thymus

  1. Cortex
  2. Hassall’s corpuscle
  3. Medulla
62
Q
A

Bursa of Fabricius

  1. Lumen
  2. Pseudostratified columnar epithelium
  3. Lobules (follicles)
  4. Muscularis
63
Q
A

Bursa of Fabricius

  1. Lumen
  2. Pseudostratified columnar epithelium
  3. Lamina propria
  4. Medulla of lobule
  5. Cortex of lobule
  6. Epithelial tuft
64
Q
A

Bursa of Fabricius

  1. Pseudostratified columnar epithelium
  2. Lamina propria
  3. Cortex of lobule
  4. Capillary filled with blood
  5. Undifferentiated epithelial cells
  6. Medulla of lobule
65
Q
A

Avian Spleen

  1. Capsule
  2. White pulp
  3. Red pulp
  4. Artery
  5. Lymphatic nodules
66
Q
A

avian spleen

  1. Red pulp
  2. White pulp
  3. Sheathed artery
67
Q
A

peyer’s Patch
smooth muscle(pink border)
Dense Irregular Connective Tissue of Submucosa
Lymphatic Nodules In Submucosa

68
Q
A

palatine tonsil of horse

secondary nodules
crypts
stratified squamous epithelium

69
Q
A

hemal node of sheep

capsule
subcapsular sinus filled with blood
cortex

70
Q
A

spleen

trabecula (capsule protruding in?)
blue area- white pulp (B and T cells)

71
Q
A

spleen

trabecula

72
Q

peyers patch

A
73
Q

tonsil of dog

A

semilunar fold

74
Q
A

hemal node

rumninants

75
Q
A

hemal node

76
Q
A

spleen

filled on top
not filled on bottom

77
Q

part of the thymus

A

hassals corpuscle

78
Q
A

thymus

21 fall: histology (36 decks)

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