WordNet

a three-sided polygon (同)trigon, trilateral
something approximating the shape of a triangle; "the coastline of Chile and Argentina and Brazil forms two legs of a triangle"
a percussion instrument consisting of a metal bar bent in the shape of an open triangle
any of various triangular drafting instruments used to draw straight lines at specified angles

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/07/29 09:25:42」(JST)

The submental triangle (or suprahyoid triangle) is a division of the anterior triangle of the neck.

It is limited:

Posterior (to the back) by the anterior belly of the digastricus,
Anterior (to the front) by the midline of the neck between the mandible and the hyoid bone;
Inferior (below) by the body of the hyoid bone while its floor is formed by the mylohyoideus.

Muscles of the neck. Anterior view.
The veins of the neck, viewed from in front.
Front view of neck.
The triangles of the neck. (Anterior triangles to the left; posterior triangles to the right. Suprahyoid labeled at left.)

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

lesson5 at The Anatomy Lesson by Wesley Norman (Georgetown University) (necktriangle)
lesson6 at The Anatomy Lesson by Wesley Norman (Georgetown University)
Anatomy figure: 25:01-03 at Human Anatomy Online, SUNY Downstate Medical Center - "Identification of the subdivsions of the anterior triangle and corresponding borders."
Anatomy photo:25:19-0101 at the SUNY Downstate Medical Center - "Anterior Triangle of the Neck: The Submental Triangle"

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1. 頚部腫瘤の評価 evaluation of a neck mass
2. 呼吸または循環障害を呈する小児の初期評価および安定化 initial assessment and stabilization of children with respiratory or circulatory compromise
3. 頚部腫瘤の鑑別診断 differential diagnosis of a neck mass
4. 成人における鼠径ヘルニアおよび大腿ヘルニアの開放修復術 open surgical repair of inguinal and femoral hernia in adults
5. 鼠径ヘルニアおよび大腿ヘルニアの分類、臨床症状、および診断 classification clinical features and diagnosis of inguinal and femoral hernias in adults

A Pilot Study of the Tongue Pull-Back Exercise for Improving Tongue-Base Retraction and Two Novel Methods to Add Resistance to the Tongue Pull-Back.

Slovarp L1, King L2, Off C2, Liss J3.
Dysphagia.Dysphagia.2016 Jun;31(3):416-23. doi: 10.1007/s00455-016-9693-y. Epub 2016 Feb 9.
This pilot study investigated the tongue pull-back (TPB) exercise to improve tongue-base retraction as well as two methods to add resistance to the TPB. Surface electromyography (sEMG) to the submental triangle was used as an indication of tongue-base activity on 13 healthy adults during: (1) saliva
PMID 26857465

Heterotopic ossification in the submental triangle remote from the vascular pedicle after reconstruction with a fibular free flap: a previously unreported complication.

Panaretou E1, Blythe JN1, Conti M1, Brennan PA2.
The British journal of oral & maxillofacial surgery.Br J Oral Maxillofac Surg.2016 May;54(4):460-2. doi: 10.1016/j.bjoms.2015.08.266. Epub 2015 Sep 26.
Fibular free flaps are routinely used to reconstruct segmental mandibular defects after resection. While ossification of the vascular pedicle is uncommon but well reported, to our knowledge, heterotopic ossification remote from the pedicle has not previously been described. We report a case in which
PMID 26416079

Symmetrical anatomical variant of the anterior belly of the digastric muscle: clinical implicat.

Buffoli B, Lancini D, Ferrari M, Belotti F, Nicolai P, Tschabitscher M, Rezzani R, Rodella LF1.
Folia morphologica.Folia Morphol (Warsz).2016;75(1):112-116. doi: 10.5603/FM.a2015.0077. Epub 2015 Sep 14.
The digastric muscle is an important surgical landmark. Several anatomical variants of the digastric muscle are reported in literature and, in particular, the presence of accessory anterior bellies of the muscle is not uncommon. Here, an unreported symmetrical variant of the digastric muscle was fou
PMID 26365851

SATO Iwao,SUNOHARA Masataka,UENO Ryuji,YOSHIDA Shyunji
Okajimas Folia Anatomica Japonica 81(2/3), 45-48, 2004
… In the submandibular triangle, one or two large branches of the MN communicated with the lingual nerve at submandibular triangle and submental triangle in 1.45% of the cases (6 out of 413 sides). … These distributions of nerve supply are an important in the operations of radical neck dissection on the submandibular triangle. …
NAID 130004773558

大関悟,前田顕之,鈴木幸一郎,本田武司,長田哲次,吉川博政
頭頸部腫瘍 27(3), 601-606, 2001
肩甲舌骨筋上頸部郭清術 (Supraomohyoid Neck Dissection, 以下SOHND) は口腔癌症例においてリンパ節の転移が高頻度にみられるオトガイ下・顎下, 上, 中内深頸部 (レベルI, II, III) のリンパ節を郭清する部分的 (領域) 頸部郭清術である。狭い術野で胸鎖乳突筋や内頸静脈, 副神経を温存した郭清を行うため, 手術手技には術者, 助手共に熟練を要する。一般的 …
NAID 130004166774

リンク元	「オトガイ下三角」
関連記事	「triangle」

Submental triangle
	Submental triangle
	Side of neck, showing chief surface markings (nerves are yellow, arteries are red)
Details
Latin	Trigonum submentale
Gray's	p.565
Dorlands; /Elsevier	t_19/12823617
	Anatomical terminology