Exam 3: Lymphatic Tissue Flashcards

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1
Q

lymphatic system

A

consists of cells, tissues, and organs that form part of the body’s immune system - protects body from harmful substances
Classified as primary or secondary

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2
Q

Primary lymphatic tissue

A

Bone Marrow, Thymus
Sites of development and maturation of lymphocytes into immunocompetent cells
Donor of lymphatics

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3
Q

Secondary lymphatic tissues

A

lymph nodes
MALT (mucosa-associated lymphatic tissue) - GALT (gut), BALT (bronchus), GU tract, tonsils
Spleen
Sites of formation of immunological defense against antigens or pathogens. Confrontation with antigens or pathogens occur here
Receiver of lymphatics

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4
Q

Diffuse Lymphatic tissue (MALT)

A

loose lymphatic tissue, simplest organization (may be loosely arranged or have more prominent basophilic structure), not sharply delineated
mostly lymphocytes, but also monocytes, acidic macrophages, and plasma cells
Reticular fibers support suspended cells

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5
Q

Diffuse lymphatic tissue is located in

A

lamina propria of some other organ - wall of GI tract (GALT), respiratory tract (BALT), or GU tract - places infection may be

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6
Q

Lymphatic Nodules (follicles)

A

Non-encapsulated, spherical, dense aggregations of lymphocytes with some organization
May be primary or secondary
May be solitary or aggregate

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7
Q

Primary lymphatic nodules

A

appears homogenous throughout, has mostly small lymphocytes
Spherical structure, no capsule
Suspended with reticular fibers

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8
Q

Secondary lymphatic nodules

A

Has 2 distinct zones
Corona (mantle) zone - outer, dark staining zone containing mature (small) lymphocytes
Germinal center - inner, light staining zone containing immature (medium or large) lymphocytes
Antigens cause germinal center to swell

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9
Q

Solitary lymphatic nodules

A

temporary structures

May appear, disappear, and reappear at a particular site

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10
Q

Lymphatic aggregates

A

permanent nodules
Peyer’s patches (B & T lymphocytes) - permanent aggregations in ileum
Lymphatic tissue in appendix - permanent aggregations in lamina prpria and submucosa of appendix
BALT in respiratory tract
Lymphatic nodules in tonsils, lymph nodes, and spleen

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11
Q

Tonsils

A

Aggregates of lymphatic nodules with B-lymphocytes (escape into lumen of pharynx and oral cavity)
Form a ring surrounding entrance to oropharynx
Have partial CT capsule - sends septa into interior of tonsil for protection from spread of tonsilar infections
Pharyngeal, Palatine, and lingual tonsils

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12
Q

Pharyngeal Tonsil (Adenoid)

A

Located in nasopharynx
Covered by pseudostratified columnar epithelium with cilia
No crypts, has pleats instead

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13
Q

Palatine Tonsils

A

Pair, each tonsil located in lateral wall of oropharynx between palatoglossal and palatopharyngeal arches
Covered by stratified squamous nonkeratinized epithelium with B-lymphocytes
Has many epithelial-lined pits - crypts that divide tonsil
Contain many lymphatic nodules with germinal centers (where B lymphocytes are produced)

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14
Q

Lingual Tonsils

A

Small bumps on dorsal surface of posterior 1/3 of tongue
Covered by stratified squamous nonkeratinized epithelium
Has crypts

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15
Q

Lymph Nodes

A

lymphatic organs located along path of lymphatic vessels to filter lymph before it passes into blood vascular system

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16
Q

Capsule

A

Consists of dense connective tissue

17
Q

Trabeculae

A

connective tissue septa that extend from capsule into lymph node carrying blood vessels and nerves

18
Q

Hilum

A

Concave

Site where blood vessels and efferent lymphatic vessels enter/leave the node