﻿The 
  Anatomy 
  of 
  the 
  Female 
  Genital 
  Tract 
  of 
  the 
  Pupipara 
  etc. 
  37 
  

  

  not 
  for 
  some 
  time 
  grow 
  at 
  all. 
  The 
  nutritive 
  cells 
  and 
  ovuni 
  of 
  the 
  

   large 
  follicle 
  of 
  the 
  larger 
  ovariole 
  would 
  all 
  increase 
  very 
  rapidly 
  

   in 
  size. 
  The 
  ovum 
  is 
  always 
  at 
  the 
  lower 
  end 
  of 
  the 
  follicle; 
  its 
  

   nucleus 
  is 
  large 
  and 
  centrally 
  situated 
  and 
  contains 
  a 
  very 
  few 
  

   chromatine 
  granules 
  and 
  a 
  nucleolus. 
  The 
  nutritive 
  cells 
  for 
  a 
  loug 
  

   tinie 
  increase 
  in 
  size 
  about 
  as 
  fast 
  as 
  does 
  the 
  ovum 
  and 
  have 
  very 
  

   large 
  nuclei 
  richly 
  charged 
  with 
  chromatine 
  granules. 
  The 
  tunica 
  

   propria 
  Covers 
  the 
  entire 
  ovariole; 
  it 
  is 
  stretched 
  to 
  disappearance 
  

   about 
  the 
  larger 
  follicle 
  after 
  this 
  has 
  become 
  of 
  large 
  size, 
  but 
  

   always 
  appears 
  on 
  the 
  narrow 
  neck 
  connectiug 
  the 
  two 
  follicles 
  in 
  

   the 
  form 
  of 
  a 
  tube 
  containing 
  scattered 
  cells. 
  On 
  the 
  lower 
  side 
  of 
  

   the 
  large 
  follicle 
  (that 
  looking 
  towards 
  the 
  receptaculum 
  seminis) 
  the 
  

   tunica 
  propria 
  usually 
  passes 
  smoothly 
  around 
  the 
  follicle, 
  as 
  is 
  

   shown 
  in 
  Fig. 
  11; 
  in 
  some 
  cases, 
  however, 
  the 
  ragged 
  end 
  of 
  the 
  

   tunica 
  may 
  be 
  Seen 
  extending 
  beyond 
  the 
  follicle 
  towards 
  the 
  oviduct 
  

   (PI. 
  III, 
  Fig. 
  1 
  2 
  tun.prop). 
  In 
  no 
  case 
  does 
  the 
  tunica 
  propria 
  extend 
  

   as 
  far 
  as 
  the 
  oviduct. 
  

  

  When 
  finally 
  a 
  follicle 
  becomes 
  the 
  largest 
  one 
  in 
  the 
  two 
  ovaries 
  

   and 
  its 
  ovum 
  is 
  the 
  next 
  one 
  to 
  pass 
  into 
  the 
  uterus, 
  its 
  growth 
  

   becomes 
  very 
  rapid. 
  Its 
  nutritive 
  cells 
  also 
  increase 
  greatly 
  in 
  size 
  

   and 
  soon 
  attain 
  their 
  maximum 
  volume. 
  The 
  ovum, 
  which 
  up 
  to 
  

   this 
  time 
  has 
  grown 
  in 
  size 
  at 
  about 
  the 
  same 
  rate 
  as 
  the 
  nutritive 
  

   cells, 
  now 
  rapidly 
  outstrips 
  them 
  and 
  is 
  soon 
  larger 
  than 
  all 
  the 
  

   nutritive 
  cells 
  together 
  (PI. 
  III, 
  Fig. 
  11 
  fohl). 
  The 
  nutritive 
  cells 
  

   now 
  begin 
  to 
  decrease 
  in 
  bulk, 
  and 
  at 
  about 
  the 
  same 
  time 
  the 
  fol- 
  

   licular 
  cells 
  begin 
  to 
  make 
  their 
  appearance 
  and 
  form 
  a 
  membrane 
  

   between 
  them 
  and 
  the 
  ovum, 
  the 
  follicular 
  cells 
  which 
  bound 
  the 
  

   nutritive 
  cells 
  on 
  the 
  outside 
  becoming 
  stretched 
  and 
  irregulär. 
  

   The 
  follicular 
  cells 
  which 
  Surround 
  the 
  ovum 
  increase 
  in 
  number 
  as 
  

   it 
  does 
  in 
  size 
  so 
  that 
  they 
  always 
  form 
  a 
  regulär, 
  columnar 
  epi- 
  

   thelium 
  about 
  it. 
  The 
  nucleus 
  of 
  the 
  ovum, 
  which 
  has 
  remained 
  

   near 
  its 
  centre 
  now 
  loses 
  its 
  nuclear 
  wall, 
  becomes 
  amoeboid 
  and 
  

   migrates 
  to 
  its 
  periphery 
  where 
  it 
  decreases 
  very 
  much 
  in 
  size. 
  The 
  

   nutritive 
  cells 
  decrease 
  rapidly 
  now 
  in 
  volume 
  and 
  the 
  ovum 
  increases 
  

   until 
  it 
  has 
  assumed 
  the 
  shape 
  characteristic 
  of 
  insect 
  eggs 
  and 
  the 
  

   nutritive 
  cells 
  being 
  deprived 
  of 
  a 
  greater 
  part 
  of 
  their 
  sub- 
  

   stance 
  are 
  reduced 
  to 
  a 
  mere 
  remnant. 
  The 
  delicate 
  chorion 
  

   forms. 
  The 
  nucleus 
  of 
  the 
  ovum 
  has 
  by 
  this 
  time 
  migrated 
  back 
  to 
  

   the 
  centre 
  of 
  the 
  ovum 
  and 
  that 
  body 
  soon 
  after 
  bursts 
  its 
  tunica 
  

  

  