( 366 ) 

 TABLE XXXVIII. 



Systematic Survey of the Sequence, according to Age, of the Human 



Tissue-groups. 



(Phylogenetic Classification of Vertebrate Tissues.) 



FIRST GROUP: PRIMARY TISSUES (Epithelium). 



1. First Histological Stage of Evolution. 

 I. Covering-tissue (Epithelium). 



I. A. Skin-covering tissue (Epithelium dermale) 

 Skin-layer, or Exoderm, of Gastrula (after- 

 wards skin-sensory layer) 



1. Outer skin (Epidermit) 



2. Glands of outer skin 



3. (Earliest site of origin cf the 

 cells ?) 



I. B. Intestinal covering tissue (Epithet, gastrale). ( 1. Real intestinal epithelium 



Intestinal layer, or Entoderm, of Gastrula < 2. Epithelium of the intestinal glands 

 (afterwards the intestinal-glandular layer) ( 3. (Earliest site of origin of egg-cell ?) 



SECOND GROUP: SECONDARY TISSUES. 

 (All derived from the Covering-tissue, or Epithelium.) 



2. Second Histological Stage of Evolution. 

 II. Connective-tissue (Connectivum). 



II. C. Filling-up tissue (Tela conjunctiva) (softer/*; Fltty"tissu? SUe 



[surrounding] connective tissue) 



11 a %%^SZMXti!T^ (firmCT ^ sSSJSS— 



( 3. Fibrous tissue 



■f 



(6. Bone-tissue 



III. B. Nerve-tissue (Tela 

 nervea). Original outer 

 portion of the nerve- - 

 muscle cells of the 

 Exoderm 



IU..P. Muscle-tissue (Tela 

 muscularis). Original 

 inner portion of the • 

 nerve-muscle cells of 

 the Exoderm 



3. Third Histological Stage of Evolution, 

 III. Nerve-muscle Tissue (Neuro-musculum). 

 'i 



Nerve-cells 

 (Ganglion-cells) 



Nerve-fibres 

 (Nerve-tubes) 



1. o. Peripheric nerve-cells (Rod-cells o* 

 the sense-organs) 



1. 6. Central nerve-cells (mind-cells) 



2. a. Sheath less nerve-fibres (pale, or 



medulla-less fibres) 

 2. 6. Sheathed nerve-fibres (dark fibres 

 with medulla) 



One-celled muscle- 

 fibres 



II 



o. Smooth contractile fibre-cells 

 O. Striped contractile fibre-cells 

 2. Many-celled muscle- J 2. a. Smooth muscle-masses 

 fibres ( 2. &. Striped muscle-masses 



4. Fourth Histological Stage of Evolution. 

 IV. Vascular Tissue (Vasalium). 



1 1. a. Exocoelarium (Parietal Coelom-epi- 



Ccelarium \ 



(Coelom - epithe- 

 lium) 



IV. O. Vascular lining tissue 

 (Tela vasalis). Inner ^ 

 wall-covering of the 

 Coelom system 



tV.ff. Lymph-tissue (Tela 

 lymphatica). Liquid 

 contents of the Coelom 



Endothelium 

 (Vascular epithe 

 Hum) 



-{ 



thelium) (and secondary site of 

 origin of the sperm-cells .') 

 1 6. Endocoelarium (Visceral coelom-epi- 

 thelium) (and secondary site of 

 origin of the egg-cells ?) 



2. a. Endothelium of the lymph-vessels 

 2. b. Endothelium of the blood-vessels 



1. Lymph (Colourless blood-cells and fluid intercellular substance) 



2. Blood (Red blood-cells and fluid intercellular substance) 



