﻿ANATOMY 
  AND 
  RELATIONSHIP 
  OF 
  GLOSSY 
  CUCKOOS 
  — 
  BERGER 
  591 
  

  

  Leg 
  Myology 
  

  

  The 
  muscle 
  formula 
  in 
  the 
  three 
  genera 
  is 
  AX 
  YAm. 
  The 
  following 
  

   muscles 
  are 
  absent: 
  pars 
  iliofemoralis 
  of 
  the 
  piriformis, 
  iliotrochan- 
  

   tericus 
  medius, 
  gluteus 
  medius 
  et 
  minimus, 
  iliacus, 
  adductor 
  digiti 
  IV, 
  

   extensor 
  brevis 
  digiti 
  III, 
  and, 
  apparently, 
  adductor 
  digiti 
  11. 
  A 
  

   vinculum 
  is 
  present 
  between 
  the 
  tendons 
  of 
  Mm. 
  flexor 
  digitorum 
  

   longus 
  and 
  flexor 
  hallucis 
  longus, 
  but 
  a 
  vinculum 
  is 
  wanting 
  between 
  

   the 
  tendons 
  of 
  Mm. 
  flexor 
  perf 
  oratus 
  digiti 
  III 
  and 
  flexor 
  perf 
  orans 
  et 
  

   perf 
  oratus 
  digiti 
  III. 
  The 
  tendon 
  of 
  insertion 
  of 
  M. 
  flexor 
  perf 
  oratus 
  

   digiti 
  II 
  forms 
  a 
  sheath 
  for 
  the 
  tendon 
  of 
  M. 
  flexor 
  perforans 
  et 
  

   perforatus 
  digiti 
  II, 
  but 
  the 
  latter 
  tendon 
  does 
  not 
  ensheath 
  the 
  

   tendon 
  of 
  M. 
  flexor 
  digitorum 
  longus 
  which 
  supplies 
  digit 
  11. 
  The 
  

   tendon 
  of 
  M. 
  flexor 
  perforatus 
  digiti 
  IV 
  does 
  not 
  ensheath 
  the 
  tendon 
  

   of 
  M. 
  flexor 
  digitorum 
  longus 
  which 
  supplies 
  digit 
  IV. 
  

  

  In 
  Lampromorpha 
  capr^ius, 
  M. 
  iliotibialis 
  (fig. 
  71) 
  arises 
  semiten- 
  

   dinous 
  from 
  the 
  entire 
  anterior 
  iliac 
  crest, 
  the 
  anterior 
  iliac 
  process, 
  

   and 
  from 
  approximately 
  the 
  anterior 
  half 
  of 
  the 
  posterior 
  iliac 
  crest. 
  

   The 
  muscle 
  is 
  composed 
  of 
  anterior 
  and 
  posterior 
  fleshy 
  portions 
  

   separated 
  by 
  a 
  central 
  aponeurosis, 
  which 
  distally 
  is 
  intimately 
  fused 
  

   with 
  the 
  underlying 
  M. 
  femorotibialis 
  externus. 
  The 
  central 
  aponeu- 
  

   rosis 
  is 
  best 
  developed 
  distally, 
  where 
  it 
  is 
  13 
  mm. 
  long 
  and 
  3.5 
  mm. 
  in 
  

   maximum 
  width 
  ; 
  proximally, 
  this 
  band 
  is 
  only 
  1 
  mm. 
  wide. 
  In 
  this 
  

   central 
  area, 
  however, 
  the 
  muscle 
  is 
  completely 
  aponeurotic 
  from 
  

   origin 
  to 
  insertion. 
  Except 
  for 
  its 
  smaller 
  size, 
  M. 
  iliotibialis 
  exhibits 
  

   the 
  same 
  structure 
  in 
  Ckal 
  cites 
  lucidus. 
  In 
  Chrysococcyx 
  cupreus 
  

   the 
  distal 
  aponeurotic 
  portion 
  is 
  the 
  same 
  shape 
  and 
  size 
  as 
  in 
  

   Lampromorpha^ 
  but 
  it 
  is 
  separated 
  from 
  the 
  aponeurosis 
  of 
  origin 
  

   by 
  a 
  central 
  fleshy 
  portion 
  5 
  mm. 
  long 
  ; 
  for 
  this 
  short 
  distance, 
  there- 
  

   fore, 
  the 
  belly 
  is 
  entirely 
  fleshy 
  from 
  anterior 
  to 
  posterior 
  border. 
  

   In 
  each 
  of 
  the 
  genera, 
  the 
  insertion 
  of 
  M. 
  iliotibialis 
  is 
  typical 
  and 
  

   its 
  belly 
  conceals 
  only 
  the 
  anterior 
  and 
  proximal 
  half 
  of 
  M. 
  biceps 
  

   femoris. 
  

  

  M. 
  semitendinosus 
  (fig. 
  71) 
  is 
  similar 
  in 
  the 
  three 
  genera. 
  It 
  arises 
  

   from 
  the 
  posterior 
  third 
  of 
  the 
  posterior 
  iliac 
  crest 
  and 
  from 
  the 
  

   transverse 
  process 
  of 
  the 
  first 
  free 
  caudal 
  vertebra. 
  Its 
  insertion 
  is 
  

   typical. 
  

  

  M. 
  gastrocnemius 
  is 
  composed 
  of 
  three 
  main 
  parts: 
  pars 
  externa, 
  

   pars 
  media, 
  and 
  pars 
  interna. 
  Pars 
  externa 
  arises 
  by 
  two 
  heads, 
  as 
  

   in 
  Coccyzus. 
  Pars 
  media 
  is 
  very 
  small 
  : 
  5, 
  7, 
  and 
  8 
  mm. 
  long, 
  respec- 
  

   tively, 
  in 
  Chalcites^ 
  Lampromorpha^ 
  and 
  Chrysococcyx. 
  The 
  fleshy 
  

   portions 
  of 
  pars 
  externa 
  and 
  pars 
  interna 
  are 
  nowhere 
  in 
  contact; 
  

   the 
  posterior 
  aspect 
  of 
  the 
  complex 
  is 
  a 
  thin, 
  tendinous 
  sheet, 
  which 
  

   connects 
  the 
  fleshy 
  bellies. 
  

  

  