152 THE STRUCTURE OF THE FOWL 



Muscle or muscles (contd.)- 



ciliary, 99 



diaphragm, 36 



involuntary, 35 



of eyeball, 98 



of iris, 100 



pectoral, 37 



pyramidal, 97 



quadrate, 97 



sterno-tracheal, 59 



supracoracoid, 37 



voluntary, 35 



ypsilo-tracheal, 58 

 Muscular stomach, 48 

 Musculi papillares, 81 



Nasal bones, 20 

 Nasal cavities, 57 

 Nasal gland, 57 

 Nephrotome, 123 

 Nerves, cerebral, 95 



spinal, 95 



sympathetic, 95 

 Neural groove, 119 

 Neural tube, 119 

 Neuromeres, 130 

 Neuropore, 120 

 Nictitating membrane, 97 

 Nostrils, 57 

 Notochord, 120 



Obturator foramen, 32 



Occipital bone, 17 



(Esophagus, 44 



Olecranon, 27 



Olfactory lobe, 94 



Oogenesis, 110 



Optic foramen, 23 



Optic lobes, 93 



Optic stalk, 131 



Optic tracts, 93 



Optic vesicles, 130 



Orbit, 97 



Orientation of embryo, 120 



Otocyst, 132 



Ovary, 70 



Oviduct, 74 



Palatine bone, 20 

 Pancreas, 55 

 Parabroncliia, 60 

 Paraxial mesoblast, 122 

 Parietal bones, 19 



Patella, 32 



Pecten, 99 



Peduncles of cerebrum, 93 



Pelvic girdle, 29 



Perching mechanism, 38 



Pericardium, 79 



Pharynx, 42 



Pia mater, 89 



Pineal body, 93 



Plumules, 107 



Polar bodies. 111 



Porta, 54 



Primaries (feathers), 107 



Primitive aortae, 139 



Primitive folds, 119 



Primitive groove, 119 



Primitive pit, 119 



Primitive streak, 118 



Proctodaeum, 53, 132 



Pronephros, 134 



Ptagium, 38 



Pterygoid bone, 20 



Pterylai, 107 



Pubis, 32 



Pupil, 100 



Pygostyle, 13 



Quadrate bone, 22 

 Quadrato-jugal bone, 20 

 Quill feathers, 106 



Radius, 27 

 Rectrices, 106 

 Rectum, 50 

 Remiges, 106 

 Retina, 100 



Rhachis of feather, 106 

 Ribs, 13 



Saccule, 102 

 Sacral vertebrae, 12 

 Scapula, 25 

 Scapus of feather, 105 

 Sciatic foramen, 32 

 Sclera, 98 

 Scleral ring, 99 

 Secondaries (feathers), 107 

 Secondary bronchi, 60 

 Segmentation, 113 

 Segmentation cavity, 115 

 Semicircular canals, 102 

 I Semicircular ducts, 102 



