Lymphoid Images Flashcards by Danielle Davis

Q

Identify

A

Lymph node

Capsule: dense irregular connective tissue
Cortex: sinuses and lymphatic nodules
Medulla: dense lymphoid tissue and sinuses

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Q

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A

Capsule: dense irregular CT
Subcapsular sinus: loose lymphoid tissue, has a few reticular cells and many lymphocytes within
Cortex (just beneath capsule, consists of sinuses and lymphatic nodules)

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Q

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A

Lymph Node

Afferent lymphatic vessel (within capsule)
Valve (control the flow of lymph through the node)
Capsule
Subcapsular sinus

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Q

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A

Lymph node

Cortical lymphatic nodules
Subcapsular sinus
Capsule
Cortical lymphatic nodules
Germinal center
Cortex

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Q

Idenitfy

A

Lymph Node: high power of secondary lymphatic nodule

Germinal Center

Mantle: concentrically arranged small lymphocytes, surrounds germinal center

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Q

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A

Dlt: dense lymphoid tissue (surrounds sinus)

Ms: medullary sinus (loose lymphoid tissue)

Reticular cells and lymphocytes within sinus

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Q

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A

Lymph node

Efferent lymphatics: notice valves in most of these vessels

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Q

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A

Lymph node

Post capillary venules with tall endothelium

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Q

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A

Lymph node

Capsule

Subcapsular sinus

Cortex

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Q

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A

Fx of HEV: cell adhesion molecules, play a role in lymphocyte recirculation

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Q

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A

Perfused spleen

Capsule

Red pulp

White pulp

Trabeculum (contains a blood vessel)

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Q

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A

Perfused spleen

White pulp

Red pulp contains (s) splenic sinuses and (c) splenic cords (between sinuses)

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Q

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A

Perfused spleen

Red pulp (surrounds white pulp)

Lymphatic nodule

Germinal center

PALS (periarterial lymphatic sheath): have central arteries within, populated by T lymphocytes, irregulr shaped portion of white pulp

PALS + Nodules = white pulp

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Q

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A

Perfused spleen

White pulp surrounded by red pulp

Central arteries within white pulp

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Q

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A

Fetal thymus

Cortex and medulla of each lobule

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Q

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A

Thymic lobule

Q

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A

Fetal thymus

Hassall’s corpuscle

Q

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A

Fetal thymus

Hassall’s corpuscles (one has been keratinized)

Q

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A

Adult thymus

Cortical areas (c)

Medullary areas (m)

2 Hassall’s corpuscles that have calcified

Surrounded by connective tissue

Q

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A

Tonsil (palatine - don’t need to know)

Dlt: dense lymphoid tissue - what tonsils are composed of

ln: lymphatic nodules - lie beneath epithelium
e: stratfied squamous epithelium
c: crypts - penetrate into the tonsil

Q

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A

Tonsil

Crypt (epithelial invagination)

Lymphatic nodules with germinal centers

Q

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(Optional)

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A

Unperfused spleen

Red pulp with sinuses in the subcapsular region

Capsule around outside

Q

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(Optional)

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A

Unperfused spleen

White pulp surrounded by red pulp (congested with blood)

White pulp - lymphatic nodule with germinal center, also in the form of PALS

Q

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(Optional)

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A

Spleen

Capsule on left

Sinuses within red pulp “stained” with hemolyzed blood (arrows)

2 areas of white pulp

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Spleen Sinuses filled with hemoglobin Cords - spongy meshwork

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Lymph node, silver

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Lymph node (silver) Capsule along bottom Reticular fibers stain black with silver

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Perfused spleen, silver

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Capsule on right Trabeculum arises from capsule White pulp in upper left Red pulp with sinuses and cords

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Tonsil (lingual) Lymphoid tissue Crypt filler with detritus Underlying skeletal muscle Glandular tissue

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Crypt on right Lymphoid tissue in center Epithelium lower left Several lymphatic nodules

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Tonsil (pharyngeal) Epithelial folds Lymphoid tissue Lymphatic nodules

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Tonsil Epithelial fold Underlying lymphoid tissue

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Tonsil Hev: postcapillary venules with tall endothelium in the dense lymphoid (lt) between 2 lymphatic nodules

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Tonsil Hev: postcapillary venules with tall epithelium