FIELD H-1 

 Columns 29, 30, and 31 



FIELD H-2 

 Columns 32, 33, and 34 



GROSS ANATOMICAL STRUCTURE:' 

 ORGAN, SYSTEM, BODY AREA 



Field H-1: Primary anatomical structure 

 Field H-2: Secondary anatomical structure 

 (Consult the Key for distinctions 

 and uses for Fields H-1 and H-2) 



Animal Structures; Symbols 1-- through 9-- and A- - through G- 

 Plant Structures: Symbols H through Q. 



(Column 30 only)- -The organ coded in Field H-1 is the organ whose specific response to 

 the test compound is being coded and is an organ affected by the pathology coded in Field E, 

 but THE ORGAN which is actually IN THE PATHOLOGICAL STATE INDICATED BY FIELD E 

 (i. e. , the organ infected by a pathogen, the organ in atrophy, the organ that is the focus 

 of the Field E pathology, etc. ) IS CODED IN FIELD H-2. Consult the Key about Symbol * 



I Nervous system, in toto ; neuromotor system (fibrillar system) of Ciliata; nerve net of 



Coelenterata 

 15 Central nervous system, in toto 



I I Brain, in toto ; suprapharyngeal ganglion of Annelida; supraesophageal ganglion of 



Arthropoda 



III Cerebrum, in toto 



112 Cerebral cortex 



113 Corpus striatum 



114 Rhinencephalon; olfactory lobe 



115 Corpus callosum 



116 Epithalamus 



117 Thalamus 



118 Hypothalamus 



119 Midbrain, in toto 



1 lA Cerebral peduncles (crura cerebri) 



IIB Corpora quadrigemina 



lie Hindbrain, in toto 



IID Cerebellum 



HE Pons 



1 IF Medulla oblongata 



1 IG Brain stem, in toto (includes the tubular portions of the hindbrain and midbrain, as well 



as the median portion of the forebrain) 

 IIH Ventricles of the brain 



12 Nerve cord (spinal cord); ventral nerve cord of Annelida and Arthropoda; longitudinal nerve 



cord of helminths 



121 Spinal canal (vertebral canal) 



122 Spinal fluid (For cerebrospinal fluid in toto , use Symbol 155. ) 



123 Connective (e. g. , circumesophageal connective) of invertebrate systems 



124 Segmental ganglion; annelid and arthropod subesophageal ganglion and other ventral 



ganglia 



13 Peripheral nervous system (somatic nervous system), in toto (excludes autonomic nervous 



system. Symbol 14) 



131 Cranial nerves, in toto 



132 Olfactory nerve 



133 Optic nerve 



Microanatomical structures (tissues, cells, fluids) constitute Field I. 



- 98 



