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Posterior triangle of the neck
From Wikipedia, the free encyclopedia
| Posterior triangle of the neck | |
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| The triangles of the neck. Posterior triangle labeled in purple. Sternocleidomastoideus runs vertically. Occipital triangle labeled at right, and subclavian triangle labeled at bottom.) | |
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| Side of neck, showing chief surface markings. (Nerves are yellow, arteries are red.) | |
| Latin | regio cervicalis lateralis, trigonum cervicale posterius |
| Gray's | subject #145 563 |
| Dorlands/Elsevier | r_07/12700361 |
The posterior triangle (or lateral cervical region) is a region of the neck.
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It has the following boundaries:
- in front, by the posterior border of the Sternocleidomastoideus
- behind, by the anterior border of the Trapezius
- its base is formed by the intermediate third of the clavicle
- its apex, by union of the Sternocleidomastoid and the Trapezius muscles at the superior nuchal line of the occipital bone
The posterior triangle is crossed, about 2.5 cm above the clavicle, by the inferior belly of the Omohyoideus, which divides the space into two triangles:
- an upper or occipital triangle
- a lower or subclavian triangle
A) Nerves and Plexuses:
- Spinal accessory nerve (Cranial Nerve XI)
- Branches of cervical plexus
- Roots and trunks of brachial plexus
B) Vessels:
- Subclavian artery (Third part)
- Transverse cervical artery
- Suprascapular artery
- Terminal part of external jugular vein
C) Lymph Nodes:
- Occipital
- Supraclavicular
D) Muscles:
- Inferior belly of omohyoid muscle
It is particularly vulnerable to damage at lymph node biopsy, where damage results in an inability to shrug the shoulders or raise the arm above the head (eg, for brushing hair)
- Norman/Georgetown lesson6
- SUNY Figs 24:01-02 - "Identification of the muscles associated with the posterolateral triangle."
- lateral+cervical+region at eMedicine Dictionary
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 As such, some of the information contained herein may be outdated.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.
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| 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 |