The Anatomy of “Paleocortex”: A Critical Review by Robert M. Pigache

By Robert M. Pigache

The leading goal of this paper is to examine the sector of mind which many authors name 'paleocortex' and to invite how a lot of the world it embraces might be defined thoroughly as cortex. prior to this is often thought of it will be significant to have a few proposal of what constitutes a cortex. consequently, within the first a part of the paper the standards utilized in developing classifications of cortex are appeared into. additionally thought of is the that means of classifications reminiscent of 'paleocortex'. Is it suitable to outline cortex during this approach? How does this view correlate with a sensible technique? the second one objective of this paper, of equivalent value to the 1st, is to check terminology. each one sector of' paleocortex' has a assessment advent that endeavoors to chop during the latest jungle of phrases and utilization and to supply a transparent account of the world in query, ahead of interpreting its status as cortex. The time period 'paleocortex' is in universal use and therefore it really is worthy shut exam. Kappers (1909) first created the time period to complement the sooner department of cortex-into archicortex and neocortex-introduced by means of Elliot Smith. Kappers utilized the time period to the mantle layer of the main primitive vertebrates (cyclostomes and selachians), the entire of which gets secondary olfactory fibres.

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The Anatomy of “Paleocortex”: A Critical Review

The major function of this paper is to examine the sector of mind which many authors name 'paleocortex' and to invite how a lot of the world it embraces could be defined thoroughly as cortex. ahead of this is thought of it will be significant to have a few notion of what constitutes a cortex. hence, within the first a part of the paper the factors utilized in developing classifications of cortex are seemed into.

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T-tl-< '\ / Broca ,TrigOLf. Oiag. Band __ of Broca Lam. Term. Semilunaris c s. 5emiLunaris E Fig. 7 A-E. The endorhinal sulcus. A Taken from Ranson and Clark (1947, Fig. 401, p. 468). Ventral view of sheep's brain. -B Taken from Gastaut et al. (1961, Fig. 33, p. 145). Ventral view of cat's brain. The lateral olfactory gyrus is depicted as in Fig. 7 A. The sulcus endorhinalis is portrayed lying medial to the lateral olfactory tract, circumscribing the tuberculum olfactorium. - C Taken from Thomalske et al.

The present account stresses connectivity, both within and between layers, and consequently looks at distribu- Anatomy of Paleocortex 39 Table 5. Table giving 80urce material for Fig. 8 Layer Level Cajal (1955) cat temporal 21(A)a mouse, 20(C)a eat frontal and temporal :l mouse temporal 4 mouse unspecified Cell No. Species (Fig. 8(1)] 7 (1) a 38 (e)a 5 mouse, rat, eat frontal and temporal lOa 6 mouse and 'I frontal lOa 7 mouse and ~ frontal and unspecified 10 19 (A) (right hand version) H mouse temporal 7 (4)a 9 mouse, eat temporal 10 (2)a 12 10 rat unspecified 40 (m)a 11 rat unspecified 40 (kaandq) 12 mouse frontal l:l mouse, cat temporal and unspecified 14 rat unspecified 15 cat temporal 21 (C)a l() mouse, cat temporal 21 (j)a 17 mouse unspecified 39 (b)a 18 mousc unspecified 38 (g)a 41 43D (c) 19 mouse unspecified 20 mouse, rat, cat frontal and temporal 21 mouse, rat, cat frontal and temporal Stevens (1969) 7 (3) 6 (4) 29 38 40 46 5 (g and h) (a) (a and c) (n and r) (j) 38 (b)a 45 (i) 6 (2)a 38 (d)a 19 (A, left hand version) 40 (o,'p" and j) 10 (I) 38 (f)a 19 (U and L) 6 (1 and 3) 7 (2) 40(h a andL) 43B 43D (a) 11 (2 and 4) 40 (i)a 43A 43D (b) 5 (j) ?

23 ..... ' __ - _ ..... ·~·:.. -:. :'C- '\ ....... :'. -- -----;-1- m~:Hi;1~""----- White matter III II 17 b - - _...... -- --1_- ___ .. _.. 1_\_/_________________ -___ _ a Pial surface to ~ $- o r. , ~ is" il' > ::l 44 R. M. Pig ache : and Valverde states that cell 14-which he likens to a double-tufted cell but for less profuse dendritic bushes-is few in number; there is no information concerning the frequency of the remaining cells. (3) Layer III. Deep Soma and Plexiform Layer This layer corresponds to layer IV (deep plexus) of Valverde, and to layer IV of Herrick who says: "The irregular cells of layer IV ....

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