protocerebrumn.
/ˌprəʊtə(ʊ)sᵻˈriːbrəm/, /ˌprəʊtə(ʊ)ˈsɛrᵻbrəm/, U.S. /ˈˌproʊdoʊsəˈribr(ə)m/, /ˌproʊdoʊˈsɛrəbr(ə)m/ΘΚΠ
the world > life > biology > biological processes > procreation or reproduction > embryo or fetus > embryo parts > [noun] > skull or brain
visceral cleft1870
metencephalon1871
chondrocranium1875
protocerebrum1885
protencephalon1887
parachordal1892
tritencephalon1910
parencephalon1911
1885 B. G. Wilder in N.Y. Med. Jrnl. 28 Mar. 354 Proto~cerebrum, a monomial..significant equivalent for..cerebral rudiment.
2. Zoology. The anterior region of the brain of an arthropod.
ΘΚΠ
the world > animals > invertebrates > phylum Arthropoda > [noun] > member of > parts of > primitive brain > anterior segment of
protocerebrum1894
1894 Amer. Naturalist 28 124 In the Hexapods..the ‘cerebrum’ of the adult is composed of at least three pairs of ganglia called by Vaillanes [read Viallanes], respectively, the protocerebrum, the deuterocerebrum and the tritocerebrum.
1948 B. Scharrer in G. Pincus & K. V. Thimann Hormones I. iv. 123 In the tropical bug Rhodnius and in other representatives of the Hemiptera..the dorsal region of the protocerebrum furnishes a ‘molting hormone’.
1969 New Scientist 10 July 56/2 It is generally known that the regulating clock mechanism of insects lies in the protocerebrum.
1993 Nature 15 July 238 The mushroom bodies in the protocerebrum are believed to be the structures of the insect brain most closely associated with higher-order sensory integration and learning.
Derivatives
ˌprotoceˈrebral adj.
ΚΠ
1890 Cent. Dict. Protocerebral, of or pertaining to the protocerebrum.
1894 Amer. Naturalist 28 125 That pair of ganglia which exist in the lobster.., between the protocerebral ganglia and the neuromeres of the antennæ.
1965 J. D. Carthy Behaviour of Arthropods i. 8 In Mantids, the inhibition seems to be imposed by the protocerebral ganglia, while in crickets, control seems rather more complex.
1993 Cell & Tissue Res. 273 71 During pupal development, marked changes in staining intensity of the protocerebral cells were detected.
This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022).
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n.1885