Lymphatic System Flashcards Preview

Anatomy > Lymphatic System > Flashcards

Flashcards in Lymphatic System Deck (14):
1

Functions

1. Fluid recovery: excess interstitial fluid is returned to general circulation
2. Immunity: secondary Structures act as homes for WBC
3. Lipid absorptions: Lacteals absorb sipids into cisterna chyli

2

Lymph

Fluid flowing through lymphatic vessels. (extra interstitial fluid picked up by lymphatic vessels)

3

Primary Structures

Directly involved in production or maturation of WBC.
Red bone marrow: located between trabeculae in spongy bone. (Skull, vertebrae, ribs, sternum, ossa coxae, proximal epiphyses of humerus and femur)
Thymus

4

Thymus

In superior mediastinum. T-cell maturation.
2 fused thymic lobes surrounded by CT "capsule"
CT has fibrous extensions called trabeculae

5

Thymus Histology

Capsule, Cortex, medulla.
Cortex has immature T-lymphocytes
Medulla has mature T-cells

6

Red Bone marrow

Site of Hemopoesis

7

Secondary lymphatic structures

Store lymphocyte and other immune cells. Composed of lymphatic cells enmeshed within a reticular extracellular CT matrix.

8

Lymph nodes

Filter and cleanse lymph. Acts as site for immune response activation.
Afferent lymphatic vessels bring lymph in. Efferent lymphatic vessels bring lymph out.

9

Lymph node histology

Capsule: CT with internal extensions called trabeculae.
Cortex: Many lymphatic nodules with germinal center that house proliferating B-Cells and macrophages.
Mantle zone (Outside of germinal center) has increased T-Cells.
Inner Medulla: B-cells, T-cells, macrophages, supported by medullary cords

10

Lymph node locations

Cervical, axillary, bachial, thoracic, intestinal, inguinal, popliteal

11

Spleen

Contains red pulp (erythrocytes and platelets) and white pulp (leukocytes). Filters blood past white pulp to check for pathogens.

12

Tonsils

Pharyngeal (monitors mucus in nasal cavity), palatine, lingual (Monitors fluid from oral cavity)

13

MALT

Mucosa-associated lymphatic tissue. Dispersed lymphatic tissue throughout mucosal membranes (GI, respiratory, genital, urinary)

14

Tonsil histology

1. pharyngeal epithelium
2.tonsillar crypts
3.lymphatic nodules