【主要な面】 ※ 参考：Wikipedia
・上面 ： 多くの篩骨蜂巣が開いている。前頭骨の眼窩部と接合する。
・後面 ： 篩骨蜂巣が不定形に開く。蝶形骨甲介、眼窩突起（口蓋骨）と接合する。
・外側面 ： 薄く、滑らかな長方形の眼窩板があり、眼窩の内側面の構成要素となる。
前部より後下方に鈎状突起が走っている。
接続）上部⇒前頭骨（眼窩部）、下部⇒上顎骨、口蓋骨（眼窩突起）、前部⇒涙骨、後部⇒蝶形骨
・内側面 ： 鼻腔の外側面となる。上鼻甲介、中鼻甲介を形成。
【関連語句】
以下は「Wikipedia」の解説文となる。
The ethmoidal labyrinth or lateral mass of the ethmoid bone consists of a number of thin-walled cellular cavities, the ethmoid air cells, arranged in three groups, anterior, middle, and posterior, and interposed between two vertical plates of bone; the lateral plate forms part of the orbit, the medial plate forms part of the nasal cavity. In the disarticulated bone many of these cells are opened into, but when the bones are articulated, they are closed in at every part, except where they open into the nasal cavity.
【 語 句 】
・ethmoidal air cells：篩骨蜂巣 ・interpose：間に挟む ・orbit：眼窩 ・nasal cavity：鼻腔 ・disarticulated：おそらく「他の骨と接合していない」くらいの意だと思われる。
【Surfaces】
The upper surface of the labyrinth presents a number of half-broken cells, the walls of which are completed, in the articulated skull, by the edges of the ethmoidal notch of the frontal bone. Crossing this surface are two grooves, converted into two openings by articulation with the frontal; they are the anterior and posterior ethmoidal foramina, and open on the inner wall of the orbit. The posterior surface presents large irregular cellular cavities, which are closed in by articulation with the sphenoidal concha and orbital process of palatine bone.
The lateral surface is formed of a thin, smooth, oblong plate, the lamina papyracea (os planum), which covers in the middle and posterior ethmoidal cells and forms a large part of the medial wall of the orbit; it articulates above with the orbital plate of the frontal bone, below with the maxilla and orbital process of the palatine, in front with the lacrimal, and behind with the sphenoid.
In front of the lamina papyracea are some broken air cells which are overlapped and completed by the lacrimal bone and the frontal process of the maxilla. A curved lamina, the uncinate process, projects downward and backward from this part of the labyrinth; it forms a small part of the medial wall of the maxillary sinus, and articulates with the ethmoidal process of the inferior nasal concha.
【 語 句 】
・edge：隆起(線) ・ethmoidal notch：篩骨切痕 ・groove：溝 ・convert：変える ・posterior ethmoidal foramen：後篩骨孔 ・sphenoidal concha：蝶形骨甲介 ・orbital process of palatine bone：口蓋骨の眼窩突起 ・oblong：長方形、楕円形 ・lamina papyracea：眼窩板 ・maxila：上顎骨 ・palatine：口蓋骨 ・sphenoid：蝶形骨 ・uncinate process：鈎状突起 ・maxillary sinus：上顎洞 ・inferior nasal concha：下鼻甲介
The medial surface of the labyrinth forms part of the lateral wall of the corresponding nasal cavity. It consists of a thin lamella, which descends from the under surface of the cribriform plate, and ends below in a free, convoluted margin, the middle nasal concha. It is rough, and marked above by numerous grooves, directed nearly vertically downward from the cribriform plate; they lodge branches of the olfactory nerves, which are distributed to the mucous membrane covering the superior nasal concha. The back part of the surface is subdivided by a narrow oblique fissure, the superior meatus of the nose, bounded above by a thin, curved plate, the superior nasal concha; the posterior ethmoidal cells open into this meatus. Below, and in front of the superior meatus, is the convex surface of the middle nasal concha; it extends along the whole length of the medial surface of the labyrinth, and its lower margin is free and thick. The lateral surface of the middle concha is concave, and assists in forming the middle meatus of the nose. The middle ethmoidal cells open into the central part of this meatus, and a sinuous passage, termed the infundibulum, extends upward and forward through the labyrinth and communicates with the anterior ethmoidal cells, and in about 50% of skulls is continued upward as the frontonasal duct into the frontal sinus.
【 語 句 】
・convoluted：入り組んだ ・olfactory nerves：嗅神経 ・mucous membrane：粘膜 ・fissure：裂孔 ・superior meatus of the nose：上鼻道 ・convex：凸状の ・concave：凹んだ ・passage：通り道 ・infundibulum：漏斗 ・frontal sinus：前頭洞
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