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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三角形 / 三角形の物 / 《米》三角定規 / (楽器の)トライアングル / 三つ組,三人組;(男女の)三角関係

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2018/03/10 05:01:56」(JST)

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The submandibular triangle (or submaxillary or digastric triangle) corresponds to the region of the neck immediately beneath the body of the mandible.

Boundaries and coverings

It is bounded:

above, by the lower border of the body of the mandible, and a line drawn from its angle to the mastoid process;
below, by the posterior belly of the Digastricus; in front, by the anterior belly of the Digastricus.

It is covered by the integument, superficial fascia, Platysma, and deep fascia, ramifying in which are branches of the facial nerve and ascending filaments of the cutaneous cervical nerve.

Its floor is formed by the Mylohyoideus anteriorly, and by the hyoglossus posteriorly.

Triangles

Beclard Triangle
Lesser Triangle
Pirogoff Triangle

Divisions

It is divided into an anterior and a posterior part by the stylomandibular ligament.

Anterior part

The anterior part contains the submandibular gland, superficial to which is the anterior facial vein, while imbedded in the gland is the facial artery and its glandular branches.

Beneath the gland, on the surface of the Mylohyoideus, are the submental artery and the mylohyoid artery and nerve.

Posterior part

The posterior part of this triangle contains the external carotid artery, ascending deeply in the substance of the parotid gland

This vessel lies here in front of, and superficial to, the external carotid, being crossed by the facial nerve, and gives off in its course the posterior auricular, superficial temporal, and internal maxillary branches: more deeply are the internal carotid, the internal jugular vein, and the vagus nerve, separated from the external carotid by the Styloglossus and Stylopharyngeus, and the hypoglossal nerve

Additional images

Anterolateral view of head and neck.
The triangles of the neck. (Anterior triangles to the left; posterior triangles to the right. Suprahyoid labeled at left.)

Summary of contents

The following summarizes the important structures found in the submandibular triangle:

1. The external and internal carotid artery
2. The internal jugular vein
3. The deep cervical lymph nodes
4. The 10th cranial nerve ( Vagus Nerve )
5. The submandibular gland
6. The submandibular lymph nodes
7. The Facial artery and vein
8. The 12th cranial nerve ( Hypoglossal Nerve

References

This article incorporates text in the public domain from page 564 of the 20th edition of Gray's Anatomy (1918)

External links

lesson5 at The Anatomy Lesson by Wesley Norman (Georgetown University) (necktriangle)
lesson6 at The Anatomy Lesson by Wesley Norman (Georgetown University)
Anatomy photo:25:16-0100 at the SUNY Downstate Medical Center
Anatomy figure: 25:01-01 at Human Anatomy Online, SUNY Downstate Medical Center
Overview at bcm.edu
Overview at howard.edu

UpToDate Contents

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English Journal

Air conduction, bone conduction, and soft tissue conduction audiograms in normal hearing and simulated hearing losses.

Adelman C1, Cohen A2, Regev-Cohen A2, Chordekar S3, Fraenkel R2, Sohmer H4.
Journal of the American Academy of Audiology.J Am Acad Audiol.2015 Jan;26(1):101-8. doi: 10.3766/jaaa.26.1.11.
BACKGROUND: In order to differentiate between a conductive hearing loss (CHL) and a sensorineural hearing loss (SNHL) in the hearing-impaired individual, we compared thresholds to air conduction (AC) and bone conduction (BC) auditory stimulation. The presence of a gap between these thresholds (an ai
PMID 25597465

Lipomas of the submandibular space: case report of a sialolipoma and review of diagnostic investigations available.

O'Rourke C1, Khan H2, Wallis F3, Fenton JE4.
Journal of oral and maxillofacial surgery : official journal of the American Association of Oral and Maxillofacial Surgeons.J Oral Maxillofac Surg.2015 Jan;73(1):99-105. doi: 10.1016/j.joms.2014.08.010. Epub 2014 Aug 11.
This report describes and discusses the radiologic investigations available for the investigation of fatty tumors of the submandibular triangle, with a focus on sialolipomas. A 33-year-old woman presented with a 3-year history of a slowly growing, painless mass in her right submandibular region. She
PMID 25511960

Japanese Journal

顎下部に発生した粘液腫の1例

日本口腔外科学会雑誌 60(5), 252-256, 2014
NAID 130005074254

自己免疫性膵炎の合併が示唆されたIgG4関連慢性硬化性顎下腺炎の1例

日本口腔外科学会雑誌 57(11), 577-581, 2011-11-20
NAID 10030273002

顎下腺に由来し頭蓋底部に及んだ溢出型粘液嚢胞の1例

日本口腔外科学会雑誌 53(8), 490-494, 2007-08-20
NAID 10019529430

Related Pictures

★リンクテーブル★

リンク元	「顎下三角」
関連記事	「triangle」「submandibular」

「顎下三角」

Submandibular triangle
	Submandibular triangle
	Side of neck, showing chief surface markings. (Nerves are yellow, arteries are red.)
Details
Identifiers
Latin	trigonum submandibulare
TA	A01.2.02.003
FMA	57779
	Anatomical terminology [edit on Wikidata]