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8 Cards in this Set

  • Front
  • Back
Lymphatic tissue is make up of two components
A. Stroma- fiberous framework made up of reticular tissue

B. Parenchyma- Cellular comonent composed of collection of cells, mainly lymphocytes.
Non-Encapsulated Lymphatic tissue
A. Nodular Lymphatic Tissue- Occurs in the form of round to oval collections of densley packed cells to form nodules.

Central region appears light and is called GERMINAL CENTER.

Outer zone of nodules is dark and called CORTEX.

Single layers of nodules form PEYERS PATCHES of ileum

B. Diffuse Lymphatic Tissue- In the form of loosly arranged cells of lymphatic tissue.
Partially Encapsulated Lymphatic Tissue
A. Types of Tonsils- Include teo palatine, one lingual, one pharyngeal tonsil

B. Structure of the tonsiles- Tonsils project under mucous membrane and take a partial covering. The mucous membrane dips inside lymphatic tissue of tonsil to form tubular invaginations called TONSILLAR CRYPTS. Surface epithelium of mucous membrane is STRATIFIED squamous non-keratinizedin PALATINE and lingual tonsils, but pseudo-stratified columnar ciliatedwith some goblet cells in pharyngeal tonsil.
The STROMA is made up of a partial capsule of dense C.T. separating the deep part of tonsil from underlying tissue. It sends prolongations called TRABECULAE into the lymphatic tissue of tonsil. The trabeculae thin out distally to become continuous with reticular fibers of the tonsil.

The STROMA contains the blood vessels, nerves and draining lymphatics of tonsil. The PARENCHYMA is made up of nodular and diffuse L.T. The diffuse L.T. includes, among the usual cells, a great number of neutrophil leukocytes.
Lymph nodes
They are bean-shaped with a depression called HILUM
Structure of Lymph nodes
1. Stroma: The fibrous framework through which vascular and
nerve supply enter the node. It is made up of:

a.Capsule.
b.Cortical and medullary trabeculae.
c.Reticular tissue.

2. Parenchyma-
a.In cortex, it is made up of nodular LT. forming cortical nodules.
b.In medulla, lymphatic tissue is in form of irregular
branching cordsof densely arranged cells called medullary cords.
c. Lymph sinuses, made of subcapsular, cortical and
medullary sinuses
Circulation of Lymph
In lymph node, lymph enters by afferent lymphatics. Lymph is received by subcapsular sinuseslying under capsule. Their lymph passes to cortical sinusesbetween cortical trabeculae and nodules, then to medullary sinusesbetween medullary cords and trabeculae. From there to efferent lymphaticswhich exit the node at hilum
FULLY ENCAPSULATED LYMPHATIC TISSUE
1. Lymph nodes
2. Thymus
3. Spleen
Thymus
A. Anatomic Features: Made up of two lobes covered by a C.T. capsule.

B. Hisological Structure:
1. Stroma: