The Morphological and Histological Characteristics of Digestive Tract in Phascolosoma esculenta
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1 Chinese Journal of Zoology (5) :1420 ( ) : ( Phascolosoma esculenta) ; ; : ; ; ; :Q :A : (2005) The Morphological and Histological Characteristics of Digestive Tract in Phascolosoma esculenta YING Xue2Ping TONGLi2Li HUANG Xiao2Lei ( School of Life and Environmental Sciences Wenzhou Normal College Wenzhou China) Abstract :Morphological and histological observation on the digestive tract of Phascolosoma esculenta was conducted with light microscopy. The digestive tract can be divided into introvert pharynx esophagus intestine rectum and anus. The introvert is contractible and the long intestine coils around a long slender central spindle muscle to form the intestine loop. The wall of digestive tract is composed of mucosa submucosa muscularis and adventitia. The epithelium of the mucosa membrane is mainly composed of columnar cells with developed microvilli except for the intestine part. In the intestine the epithelium cells have developed microvilli but the development of submucosa and muscularis is different at different portions. Key words : Phascolosoma esculenta ; Digestive tract ; Histology ; Morphology ( Phascolosoma esculenta) ( Sipunculoidea) (Sipuncula) ( Phascolosoma) [16 ] [7 ] [8 ] [1 ] (No. S2003A003) ; ; ; E2mail : com [2 350 ] : :
2 5 : (1) mm 215 % 7m H. E Olympus BX40 ( introvert ) (pharynx) (esophagus) (intestine) (rectum) (anus) (2) 1 Fig. 1 Phascolosoma esculenta A. ( = 7 mm) ; B1 ( = 0135 mm) ; C1 ( = 0108 mm) ;D1 A. the outlook of dorsal feature (the scale bar = 7 mm) ; B. the tentacles and hook which immersed in the introvert (the scale bar = 0135 mm) ; C. the front look of hook (the scale bar = 0108 mm) ; D. the anus. 2 ( = 5 mm) Fig. 2 Dorsal dissection of Phascolosoma esculenta (the scale bar = 5 mm) i. ; p. ; e. ; d. r. ; v. r. ; sp. m. ; a. ; w. m. ; d. i. ; de. i. ; a. i. ; r. ; c. i. introvert ; p. pharynx ; e. esophagus ; d. r. dorsal retractor muscle ; v. r. ventral retractor muscle ; sp. m. spindle muscle ; a. anus ; w. m. wing muscle ; d. i. dissociative intestine ; de. i. descending intestine ; a. i. ascending intestine ; r. rectum ; c. caecalsac ( introvert) 813 (1 : B)
3 16 Chinese Journal of Zoology mm ( :1) (1 : C) ( pharynx) ( esophagus) 34 (2 :p) ( :2) (2 :e) ( intestine) (2) (23 ) (spindle muscle) ( :3) ) ; ( :3 4) (intestine loop) ( esophagus) 4 : ( ) ( ) 2832 ( :5) ( rectum) ( intestine) 7 mm (2 :c) (2 :w. m) ( anus) ( 10 mm) (1 :D 2 :a) ( : 212 6) 4 : (mucosa memberane) (submucosa) (lamina mucularis) (adventitia) ( :1 5) ( :1 3) ( introvert) 3
4 5 : 17 [4 ] ( Sipunculus ( :1 2) ( : 3) [3 ] ( :3) ( :4) ( :4) ( :5) ( rectum) ( :6) 3 30 cm [3 ] [9 ] 6 ; [3 ] nudus) 56 mm (tufted orgens) [9 ] [10 ]
5 18 Chinese Journal of Zoology (3) :78901 [9 ] [9 ] 79 : [ 1 ]. ( ). [ 2 ] Meglitsch P A Schram F R. Invertebrate Zoology. New York Oxford :Oxford University Press [ 3 ] (3) : [ 4 ] (3) :59661 [ 5 ]. ( ) (1) :93991 [ 6 ] (3) :57711 [ 7 ] Edward E R Mary E R. Functional organization of dermal coelomic canals in Sipunculus nudus ( Sipuncula ) with a disscusion of respiratory designs in Sipunculus. Invertebrate Biology (1) : [ 8 ] Portner H O Kreutzer U Siegmund B et al. Metablic adaptation of the intertidal worm Sipunculus nudus to functional and environmental hypoxia. Marine Biology 1984 [ 9 ] (4) : [10 ] Boer H H Kits K S. Histochemical and ultrastructural study of the aliamentary tract of the freshwater snail Lymnawa slagnalis. J Morph : ; ; 31 4 ; ; ; Explanation of Plate 11 transverse section of the front introvert showing the introvert cavity andintrovert wall 10 ; 21 transverse section of the middle introvert 10 ; 31 transverse section of the end introvert showing introvert cavity and the phenomenom of dislocation 4 ; 41 magnification of transverse section of the end introvert 40 ; 51 magnification of transverse section of part esophagus 40 ; 61 magnification of transverse section of part dissociative intestine ; ; ; ; ; Explanation of Plate 11 transverse section of upper descending intestine showing intestine cavity 10 ; 21 magnification of transverse section of part upper descending intestine 40 ; 31 magnification of transverse section of part under descending intestine 40 ; 41 magnification of transverse section of part under ascending intestine 40 ; 51 magnification of transverse section of part upper ascending intestine 40 ; 61 transverse section of rectum 101 Ad : ; CMF : ; CCC: ; FG: ; GC: ; GdC: ; IntC: ; IntrC: ; LM: ; LMF : ; PP : ;Su : ; Sh :;Vi : Ad :adventitia ; CMF :circular muscle fibers ; CCC:cilia columnar cells ; FG:finger gibbosity ; GC:goblet cell ; GdC:granular cell ; IntC:intestine cavity ; IntrC:introvert cavity ; LM:lamina muscularis ; LMF :longitudinal muscle fibers ; PP :plicate part ; Su :submucosa ; Sh :sheath ; Vi :villus.
6 5 : 19 : YING Xue2Ping et al. : The Morphological and Histological Characteristics of Digestive Tract in Phascolosoma esculenta Plate
7 20 Chinese Journal of Zoology 40 : YING Xue2Ping et al. : The Morphological and Histological Characteristics of Digestive Tract in Phascolosoma esculenta Plate
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