Investing Layer of Deep Cervical Fascia

lamina superficialis fasciae cervicalis profundae

The investing (superficial) layer of deep cervical fascia is the outermost layer of the deep cervical fascia encircling the neck as a complete cylinder deep to the platysma. It splits to enclose the sternocleidomastoid and trapezius muscles and to form the roof of the anterior and posterior cervical triangles. Superiorly it attaches to the mandible, mastoid, and occiput; inferiorly to the clavicle and manubrium.

Anatomical Data

Boundaries & Contents

Location	Neck, the outermost layer of deep cervical fascia, beneath platysma and the superficial fascia
Boundaries	Above: external occipital protuberance, superior nuchal line, mastoid process, zygomatic arch, lower border of the mandible and hyoid bone Below: manubrium, clavicles, acromion and spine of the scapula Behind: ligamentum nuchae and the cervical spinous processes Splits to enclose trapezius, sternocleidomastoid, and the parotid and submandibular glands
Contents	Sternocleidomastoid and trapezius Parotid and submandibular glands Suprasternal space with the jugular venous arch

Biomechanics

Function & Actions

Wraps the neck like a collar, encloses the two large superficial muscles and two salivary glands, and forms the roof of the anterior and posterior triangles of the neck.

Clinical Relevance

Clinical Notes

The investing cervical fascia is the first deep fascial layer encountered in neck dissection and in approaches to the cervical spine, carotid artery, and thyroid. It defines the deep boundary of cervical lymph node groups for nodal dissection planning. The deep cervical fascia system (investing, pretracheal, prevertebral layers with the alar fascia) defines the distinct spaces of the neck and their infection spread patterns. Incision through this layer in the anterior cervical triangle exposes the strap muscles below.

Pathology

Common Injuries & Conditions

Deep Cervical Space Infection Spreading Through Fascial Planes

Tonsillar or dental infections may penetrate the investing cervical fascia and spread between fascial layers into the parapharyngeal or retropharyngeal space, tracking along the danger space to the posterior mediastinum, producing descending necrotising mediastinitis requiring emergency surgical drainage through the neck and chest.

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