Submandibular triangle

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Submandibular triangle
The triangles of the neck. (Anterior triangles to the left; posterior triangles to the right. Submaxillary triangle labeled at left, second from top.)
Side of neck, showing chief surface markings. (Nerves are yellow, arteries are red.)
Latin	trigonum submandibulare
Gray's	subject #145 564
Dorlands/Elsevier	t_19/12823608

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

Contents 1 Boundaries and coverings 2 Divisions 2.1 Anterior part 2.2 Posterior part 3 See also 4 Additional images 5 External links

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 and the Stylohyoideus; 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, Hyoglossus, and Constrictor pharyngis superior.

Divisions

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

Anterior part

The anterior part contains the submaxillary gland, superficial to which is the anterior facial vein, while imbedded in the gland is the external maxillary 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 internal 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 glossopharyngeal nerve

See also

• Anterior triangle of the neck

Additional images

Anterolateral view of head and neck.

External links

• Norman/Georgetown lesson6
• SUNY Labs 25:16-0100
• SUNY Figs 25:01-01
• submandibular+triangle at eMedicine Dictionary
• Overview at bcm.edu
• Overview at howard.edu

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

v • d • e General anatomy of neck (Throat • Pharynx • Larynx)
Cartilages	Cricoid • Thyroid (Laryngeal prominence) • Epiglottis • Arytenoid • Cuneiform • Corniculate
Ligaments	extrinsic ligaments: Thyrohyoid membrane (Lateral thyrohyoid ligament, Median thyrohyoid ligament) • Hyoepiglottic ligament • Cricotracheal ligament intrinsic ligaments: Cricothyroid ligament
Folds and related structures	folds: (Glossoepiglottic, Aryepiglottic, Vocal, Vestibular) Vocal ligament • Ventricle of the larynx • Infraglottic cavity • Vestibule of larynx • Rima glottidis • Glottis
Triangles of the neck	Anterior of the neck (Muscular, Carotid, Submandibular, Submental) Posterior of the neck (Occipital, Subclavian) Suboccipital
Fascia	Deep cervical fascia (Pretrachial fascia, Prevertebral fascia, Investing layer) • Carotid sheath • Buccopharyngeal fascia
Other	Retropharyngeal space