. The anatomy of the central nervous system of man and of vertebrates in general. Neuroanatomy; Central Nervous System. THE CEEEBKUM OR PROSElSrCEPHALON. 151 at least in large reptiles, between the cortex of the olfactory lobes and the epistriatum: Tr. cortico-epistriaticus. The olfactory apparatus, then, as far as described, consists of a com- bination of at least two nenrons: a peripheral neuron of the I order, from the nasal mucous membrane to the bulbus; and a central neuron of the II order, from the bulbus to one of the several termini above enumerated. But from these terminations proceed
. The anatomy of the central nervous system of man and of vertebrates in general. Neuroanatomy; Central Nervous System. THE CEEEBKUM OR PROSElSrCEPHALON. 151 at least in large reptiles, between the cortex of the olfactory lobes and the epistriatum: Tr. cortico-epistriaticus. The olfactory apparatus, then, as far as described, consists of a com- bination of at least two nenrons: a peripheral neuron of the I order, from the nasal mucous membrane to the bulbus; and a central neuron of the II order, from the bulbus to one of the several termini above enumerated. But from these terminations proceed other tracts of the third, or higher, order. In the first place, the olfactory centers—, the terminations of the II neuron are uniformly connected by a tract with the Epithalamus, espe- cially with the Ggl. habenulge. Carefully study these relations in Fig. Epistriatum Rejio part. caud. striat. Tajnia »vith tliree origins of bundles Nucleus tainite Tr. strio-tlialamious Tr. septo-raesenceph. Deouss. transverse Fig. 99.—Frontal section through the most posterior portion of the Cere- brum of the Swamp-turtle: Emys lutaria. Note dorsally the mantle with its cortex, ventrally the transition to the thalamus with the underlying chiasma, at the right the posterior end of the olfactory region. A second connection passes from the olfactory center to the brain- cortex. This tract might be designated the Tr. cortico-olfadorii. It is absent in fishes, is probably present in amphibians and birds, and is well developed in reptiles and mammals. The cortico-olfactory tract is, as you will find later, the first connection which was established between the brain-cortex and any sensory apparatus. Just because of this important fact this tract will be discussed later in connection with the development of the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these il
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