Lymphoid & Epithelial structures Flashcards
which two types of leukocytes are found in lymph nodes
Lymphocytes & macrophages
what are the structures that lymph flows as it enters and then leaves a lymph node
- The subcapsular sinus drains to the trabecular sinuses
- The trabecular sinuses empty into the medullary
sinuses - The lymph flows out of the medullary sinuses via the
efferent lymph vessels - The concave side of the lymph node is called the hilus
what is the main cell type in germinal centers of lymph nodes?
B cells
which type of white blood cells are most common in the outer (superficial) cortex; the deeper (paracortex) cortex; the medulla?
- Outer (superficial) cortex:
o B cells - Depper (paracortex) cortex:
o T lymphocytes - Medulla:
o Plasma cells
o Macrophages
o B cells
What three lymph nodes drain the head?
- Parotid lymphocenter
- Mandibular lympyhocenter
- Retropharyngeal lymphocenter
which lymph node drains the first three mammary glands in the dog
axillary lymph node
which lymph nodes drain the udder of a cow
superficial inguinal lymph nodes
which structures are drained by the thoracic duct
Deep cervical lymph nodes
a. Along the trachea
b. Drains the deep/ventral structures of the neck to
the thoracic duct on the left side or the lymphatic
duct on the right
which structures are drained by the right lymphatic duct
Right and left tracheal (jugular) trunks
a. Travel along the trachea and drain the lymph nodes
of the head/neck
b. Empty into the thoracic duct on the left side, the
right lymphatic duct or the vessels of the thoracic
inlet
what structures drain into the visceral trunk (3 lymphocenters)
Drains the celiac, cranial and caudal mesenteric lymphocenters to the cisterna chyli
what side of the body is the spleen on?
left
what is an ellipsoid? What is another name for it?
Sheathed capillaries aka “ellipsoid”
- Surrounded by open-filled spaces of the splenic cord
- Accumulations by B lymphocytes & macrophages
what specific site of the spleen does erythrocyte phagocytosis occur?
splenic cords
what branch of the aorta supplies the spleen?
splenic artery
difference between red pulp and white pulp of the spleen
Red pulp:
- Makes up the bulk of the spleen
White pulp:
- Lymphatic tissue
- Forms nodules and sheaths of lymphocytes around
arteries and arterioles
marginal zone
- Adjacent to the pulp
- Most blood enters the red pulp in the marginal zone
which organ in the lymphoid system filters blood
spleen
organ is the primary lymphatic organ of mammals?
thymus
what is the main type of lymphocyte found in germinal centers? What is produced by germinal centers?
- B-lymphocytes are the main lymphocyte found in germinal centers
- Antibody secreting plasma cells & memory B cells
Do germinal centers form in the thymus?
NO
what are the three principle cell types found in the thymus?
- Thymocytes
- Macrophages
- Epithelio-reticular cells