﻿32 
  

  

  H. 
  S. 
  Pratt, 
  

  

  fibres 
  which 
  form 
  tlie 
  inner 
  portion 
  of 
  the 
  peritoneal 
  sac 
  and 
  also 
  a 
  

   coating 
  about 
  the 
  ovarioles 
  (PL 
  III, 
  Fig. 
  12 
  peri.mus 
  and 
  peri.con). 
  

   Entering 
  the 
  peritoneal 
  sac 
  from 
  the 
  body-cavity 
  are 
  numerous 
  small 
  

   tracheae 
  and 
  nerves. 
  The 
  branched 
  muscles 
  are 
  best 
  studied 
  in 
  a 
  

   small 
  oyaiy. 
  In 
  large 
  ovaries 
  in 
  which 
  the 
  principal 
  ovum 
  is 
  well 
  

   developed, 
  the 
  muscles 
  are 
  so 
  much 
  distended 
  that 
  it 
  is 
  often 
  im- 
  

   possible 
  to 
  distinguish 
  their 
  striation, 
  and 
  they 
  may 
  appear 
  more 
  like 
  

   an 
  irregulär 
  mesh-work 
  of 
  anastomosing 
  connective-tissue 
  fibres. 
  At 
  

   the 
  side 
  of 
  a 
  small 
  ovary 
  the 
  muscles 
  appear 
  as 
  broad 
  fibres 
  with 
  a 
  

   round 
  or 
  elliptical 
  cross-section 
  (Fig. 
  12 
  pe?\mus) 
  containing 
  many 
  

   nuclei; 
  in 
  a 
  flat 
  view 
  they 
  appear 
  as 
  broad, 
  irregularly 
  shaped 
  

   muscle-cells, 
  anastomosing 
  freely, 
  each 
  cell 
  containing 
  a 
  nucleus 
  

   (PI. 
  III, 
  Fig. 
  15). 
  There 
  are 
  no 
  straight, 
  unbranched 
  muscles-fibres 
  

   connecting 
  the 
  ovary 
  with 
  other 
  organs 
  or 
  with 
  the 
  body-wall 
  as 
  is 
  

   the 
  case 
  with 
  the 
  vagina 
  and 
  the 
  uterus, 
  the 
  nerves 
  and 
  tracheae 
  

   entering 
  the 
  ovary 
  being 
  the 
  only 
  suspensory 
  apparatus 
  attached 
  to 
  it. 
  

  

  The 
  connective-tissue 
  fibres 
  composing 
  the 
  inner 
  layer 
  of 
  the 
  

   peritoneal 
  sac 
  are 
  always 
  easily 
  distinguished 
  in 
  sections 
  from 
  the 
  

   muscle-fibres. 
  They 
  form 
  a 
  distinct 
  layer 
  beneath 
  the 
  muscles, 
  the 
  

   thickness 
  of 
  which 
  is 
  considerably 
  less 
  than 
  that 
  of 
  the 
  muscle-layer 
  

   (Fig. 
  12). 
  Where 
  the 
  peritoneal 
  sac 
  is 
  stretched 
  by 
  the 
  presence 
  of 
  

   a 
  large 
  ovum, 
  the 
  muscle 
  fibres 
  do 
  not 
  show 
  their 
  striations, 
  as 
  has 
  

   already 
  been 
  mentioned, 
  and 
  the 
  connective-tissues 
  fibres 
  of 
  the 
  

   inner 
  layer 
  and 
  the 
  muscle-fibres 
  of 
  the 
  outer 
  one 
  have 
  the 
  same 
  

   appearance, 
  except 
  that 
  the 
  former 
  are 
  smaller 
  in 
  cross-section 
  and 
  

   contain 
  far 
  fewer 
  nuclei 
  than 
  the 
  latter. 
  The 
  interSpaces 
  between 
  

   the 
  muscles 
  contain 
  numerous 
  delicate 
  Strands 
  of 
  connective-tissue 
  

   which 
  pass 
  among 
  them 
  from 
  the 
  inner 
  layer. 
  The 
  outer 
  surface 
  of 
  

   the 
  peritoneal 
  sac 
  is 
  covered 
  by 
  a 
  membrana 
  externa. 
  According 
  to 
  

   Leuckart's 
  description 
  the 
  inner 
  surface 
  of 
  the 
  peritoneal 
  sac 
  is 
  also 
  

   lined 
  with 
  a 
  structureless 
  membrane 
  which 
  is 
  a 
  continuation 
  of 
  the 
  

   intima 
  of 
  the 
  oviducts. 
  This 
  membrane 
  does 
  not 
  appear 
  in 
  my 
  pre- 
  

   parations. 
  

  

  But 
  connective-tissue 
  fibres 
  not 
  only 
  form 
  the 
  inner 
  surface 
  of 
  

   the 
  peritoneal 
  sac 
  but 
  they 
  fill 
  the 
  distal 
  end 
  of 
  the 
  sac 
  and 
  form 
  a 
  

   coating 
  around 
  the 
  ovarioles 
  (PI. 
  III, 
  Fig. 
  12). 
  In 
  a 
  very 
  small 
  ovary 
  

   containing 
  very 
  young 
  ova, 
  such 
  as 
  is 
  figured 
  in 
  Figure 
  1?, 
  the 
  peri- 
  

   toneal 
  covering 
  of 
  the 
  separate 
  ovarioles 
  may 
  be 
  studied 
  very 
  favorably. 
  

   The 
  distal 
  end 
  of 
  the 
  ovarial 
  sac 
  is 
  seen 
  to 
  contain 
  a 
  mass 
  of 
  connective- 
  

   tissue 
  fibres 
  in 
  which 
  are 
  imbeddecl 
  the 
  distal 
  ends 
  of 
  the 
  ovarioles. 
  

  

  