REINFORCEMENT FASCICULUS OF
\ɹˌiːɪnfˈɔːsmənt fasˈɪkjʊləs ɒv], \ɹˌiːɪnfˈɔːsmənt fasˈɪkjʊləs ɒv], \ɹ_ˌiː__ɪ_n_f_ˈɔː_s_m_ə_n_t f_a_s_ˈɪ_k_j_ʊ_l_ə_s ɒ_v]\
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A band of fibres from the corpus inominatum, or lateral part of the antero-lateral column of the medulla, which is continued up behind and around the corpus olivare, is lined on its inner or central surface with cineritious substance, enlarges as it ascends, passes over the upper surface of the pons Varolii, and is expanded into the optic thalamus. It thus forms, in its course, the anterior paries of the fourth ventricle, and is brought into view by brushing away the tuberculum cinereum or gray matter of the ventricle. The band has received these names owing to its constantly increasing as it ascends, and being mixed up with gray matter on its inner face, from which its seems to derive new fibres.
By Robley Dunglison
