title: [The connective network of the spleen from a 18 cm long (crown-rump) human foetus. Plastic reconstruction and some reflections concerning the architecture of the human spleen (author's transl)].
abstract: In the human foetus, the splenic function is double: metabolic action and blood storage. The primitive structure of the spleen is more clearly demonstrated at that stage than in the newborn or the adult. 1. Our negative reconstruction by means of "Hominit" and "Negokoll" demonstrates the connective network of the spleen from a 18 cm long (crown-rump) human foetus with a linear magnification of 300. The complete model is 15 cm high. 2. Dimensions: :formula (see text):3. In man the connective network originates from the capsule and from the trabecular ramifications. 4. In the 18 cm long foetus, there is an intense budding of cylindrical radiating trabeculae from the internal face of the capsule. 5. At the same stage, the undercapsular network is still incomplete. It firstly appears between the radiating trabeculae and the periphery of the venous trabeculae. 6. We divide the splenic parenchyma into two zones: an outer layer (undercapsular) and an inner layer which shows itself an internal and an external zone. 7. The internal zone contains the 1st to 3rd order ramifications of the trabecular tree (vascular trabeculae with venous and arterial components). The external zone corresponds to the 4th, 5th and 6th order ramifications (venous trabeculae). 8. The splenic lobules are delimited from the connective network. Their dimensions are as follows: :formula (see text):.
mesh_terms: D000328:Adult; D003238:Connective Tissue / Q000033:anatomy & histology / Q000196:embryology; D006801:Humans; D007231:Infant, Newborn; D008953:Models, Anatomic; D013154:Spleen / Q000033:anatomy & histology / Q000196:embryology*
vernacular_title: La trame conjonctive de la rate humaine d'un foetus de 18 cm tête-siège. Reconstruction plastique et quelques réflexions concernant l'architecture de la rate humaine.