medulla

Japanese: medulla

… The surface of the thymus is surrounded by a connective tissue capsule, which continues into the parenchyma and becomes interlobular connective tissue, dividing the parenchyma into numerous lobules. Looking at each lobule, the outer layer is called the cortex and is densely packed with cells, while the center is sparser than the cortex and is called the medulla. In both the cortex and the medulla, there are three types of cells: lymphocytes, epithelial reticular cells, and macrophages. …

From [Lichen]

… The external morphology of lichens varies, but they can be broadly divided into three types: crusty lichens (e.g., Psammophila), in which the lichen is undifferentiated and adheres closely to the substrate; foliose lichens (e.g., Parmelioides nigra, Psammophila serrata), in which the lichen is leaf-like and dorsoventral, with rhizoids or umbilicates on the underside; and arborescent lichens (e.g., Usnea nigra, Psammophila serrata), in which the lichen attaches to the substrate at its base and either stands up or hangs down. In typical foliose lichens, the internal structure of the lichen is differentiated into a protective cortex and an assimilated algal layer (gonidia layer) and medulla. In arborescent lichens, the cortex, algal layer, and medulla are arranged concentrically from the outside to the inside, and some have a central axis. …

*Some of the terminology explanations that mention "medulla" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…　胸腺の表面は結合組織性の被膜につつまれ，そのつづきが実質の中に入り，小葉間結合組織となって実質を数多くの小葉lobuleに分けている。各小葉を見ると，その表層は皮質cortexとよばれ，細胞が密集し，中心部は細胞が皮質に比べるとまばらで，髄質medullaとよばれている。皮質，髄質をとわず細胞にはリンパ球，上皮性細網細胞，マクロファージの3種がある。…

【地衣類】より

…　地衣体の外部形態はさまざまであるが，地衣体が未分化で基物に密着する固着地衣類(例，チズゴケ)，地衣体が葉状で背腹性があり，裏面に仮根(偽根)や臍状体（さいじようたい）をもつ葉状地衣類(例，ウメノキゴケ，イワタケ)，地衣体の基部で基物に付着し，立ち上がったり垂れ下がったりする樹枝状地衣類(例，サルオガセ，ハナゴケ)の三つに大別できる。地衣体の内部構造は典型的な葉状地衣類では，保護組織の皮層と同化組織の藻類層(ゴニジア層)や髄層medullaに分化する。樹枝状地衣類では皮層，藻類層，髄層が外側から内側へと同心円状に配列し，中心に軸をもつものもある。…

※「medulla」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典第２版について | 情報

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