BIOL 2304 Human Anatomy Table of Lymphatic TissuesPrimary Ly Organ Locations Basic Tissue Frame CT capsule Main Features Functions1./ Bone Marrow- red- yellowInterior of all bonesat birth: all bonesadult: axial skeletongirdlesprox. epiphysis ofhumerus & femurat birth: noneadult: limbsmedullary cavitydistal epiphysis-reticular CT-reticular cells(= fibroblasts)No - forming bloodcells of all stagesof maturation-sinusoids (widecapillaries)adipose tissueHematopoiesisdormant Dr. Anikó Szabó Hill Table of Lymphatic Tissues page 1Primary Ly Organ Locations Basic Tissue Frame CT capsule Main Features Functions2./ ThymusTwo-lobedPosterior tosternumSuperior thoraxInferior neckNo reticular CT !!!No follicles!!!It is a gland/ fromEPITHELIAL ORIGIN,lining of the embryonicpharynxStar-shaped epithelialreticular cellsNo Lobules(cauliflower look)cortex: darkmany T ly-cytesmedulla: light-less T ly-cytes -thymic=Hassall'scorpuscles=degeneratingepithelial reticularcells-T lymphocytesmaturation:immunocompetenceself-tolerance-Does not directlyfight microbes- secretion of thymichormones:thymosinthymopoietinDr. Anikó Szabó Hill Table of Lymphatic Tissues page 2Secondary LyorgansLocations Basic Tissues CT capsule Main Features Functions1./ Lymph nodes500bean shaped Superficial: cervical axillary inguinalDeep: iliac aortic tracheobronchialReticular CT nest:Reticular cellsMacrophagesLymphocytesFibrous capsule ofdense CT ↓trabeculae ↓compartments Cortex:follicles or nodules germinal centers (light)Medulla:sinusoidsAff / Eff ly vesselsLymph filtersInfection-fighting2./ Spleen Left superiorquadrant ofabdominal cavity,Posterior tostomachReticular CT nestReticular cellsMacrophagesLymphocytesFibrous capsule ofdense CT ↓Trabeculae/ centralartery White pulp (darker) lymphoid tissueRed pulp (light) venous sinuses splenic cords(reticular CT +macrophages)Blood filtersInfection fightingBlood cellgraveyardDr. Anikó Szabó Hill Table of Lymphatic Tissues page 3Secondary LyorgansLocations Basic Tissues CT capsule Main Features Functions3./ TonsilsSwellings of themucosa of pharynx MALTRing around thepharynx:Palatine (2)Lingual (1)Pharyngeal (2)Tubal (2)Reticular CT nest:Reticular cellsMacrophagesLymphocytesNOE: Stratifiedsquamous epith.CT: lamina propria MALT Crypts=invagination ofepitheliumLymphoid folliclesRemove pathogensfrom air and food4./ Peyer's PatchesAggregatedlymphoid nodules401cm x 1 cmMALTIleum of smallintestinesReticular CT nest:Reticular cellsMacrophagesLymphocytesNO Lymphoid folliclesin wall of ileumRemove pathogensfrom foodMemory cellproduction5./ AppendixMALTCecum Reticular CT nest:Reticular cellsMacrophagesLymphocytesNO Lymphoid folliclesin wall of appendixRemove pathogensfrom foodMemory cellproductionDr. Anikó Szabó Hill Table of Lymphatic Tissues page
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