investing layers of deep cervical fascia
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Investing layers of deep cervical fascia

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These laminar conholesations take different names in different regions and are constant with every other either directly or indirectly via loose areolar tissue. The free areolar tissue creates fascial sheets or laminae in exactly the same way as unwoven cotton creates sheets of material after spinning. These laminae ensheath muscles and other moving structures.

This allows movement between the sheaths and movements of structures inside them. Investing Fascia This layer encircles the neck like a collar, deep to platysma and superficial fascia. In doing so it encloses the sternocleidomastoid and trapezius — the 2 large superficial muscles on each side of the neck. Anteriorly through the midline, it becomes constant with its counter part of the other side.

The deep layer covers the medial outermost layer of the gland and is connected to the mylohyoid line of the mandi-ble. Posterior to the submandibular gland , at the lower pole of the parotid gland , it divides to enclose this gland as well. The superficial layer is powerful and covers the superficial surface of the parotid gland as parotidomasseteric fascia to get connected to the lower border of the zygomatic arch. The deeper layer enters deep to the parotid gland to get connected to the lower border of the tympanic plate and styloid process of the temporal bone.

The part of the layer extending between the styloid process and the angle of mandible conholeses to create the stylomandibular ligament which divides the parotid gland from submandibular gland When followed downwards, the fascia divides twice to enclose 2 spaces: Above the suprasternal notch, it divides into 2 layers to enclose suprasternal space of Burns before being connected to the anterior and posterior edges of the suprasternal notch. The suprasternal space includes: Sternal heads of sternocleidomastoid muscles, Jugular venous arch, Interclavicular ligament and Lymph node occasionally.

Above the middle third of clavicle, it divides into 2 layers to enclose the supraclavicular space. The anterior and posterior layers get connected to the anterior and posterior edges of the upper surface of the clavicle. The posterior layer encloses the inferior belly of omohyoid and after being connected to clavicle it becomes continuous with the posterior layer of clavipectoral fascia. The supraclavicular space includes: Terminal part of the external jugular vein and Supraclavicular nerves until they get cutaneous.

The investing layer also creates fascial pulleys to anchor the tendons of the digastric and omohyoid muscles. Horizontal tracing: When delineated forwards from its connection to ligament nuchae, it first splits to enclose the trapezius, subsequently creates the roof of the posterior triangle, then again splits to enclose the sternocleidomastoid and ultimately creates the roof of the anterior triangle. Pretracheal Fascia This layer of deep cervical fascia covers the front and sides of trachea , thus its name- pretracheal fascia.

It splits to enclose the thyroid gland creating its capsule and is connected to the oblique line of thyroid cartilagevand to the arch of cricoid cartilage anteriorly. A fibrous group termed ligament of Berry is originated from this fascia and attaches the capsule of the lateral lobe of the thyroid gland to the cricoid cartilage. Delineating of the Pretracheal Fascia Horizontal tracing: When followed horizontally, it unites with all the investing layer of deep cervical fascia enclosing the sternocleidomastoid and the anterior wall of the carotid sheath.

Clinical significance The connection of pretracheal fascia to hyoid bone and thyroid and cricoid cartilages enables the thyroid gland to move up and down with the larynx during swallowing. The layers of pretracheal fascia which cover the posterior surface of the thyroid lobe is ill defined. Because of this, enlarged thyroid goitre easily bulges posteriorly to compress the esophagus causing dysphagia. The pretracheal fascia gives a slick surface to enable free movements of trachea during swallowing.

Delineating of the Prevertebral Fascia Horizontal tracing: When followed laterally, it covers the scalene muscles, levator scapulae and splenius capitis creating the fascial carpeting of the posterior triangle. The roots of cervical spinal nerves that create the cervical and brachial plexuses are located deep to it. As the trunks of brachial plexus and subclavian artery issue between the scalenus anterior and scalenus medius and move to the axilla, they carry with them a tubular sheath of the fascia, referred to as axillary sheath, which might go up to the elbow.

The subclavian and axillary veins are located outside the sheath to enable their free dilation during increased venous return from the upper limb. Delineated below, it continues downwards in front of longus colli muscles into the superior mediastinum where it combines with all the anterior longitudinal ligament of the upper thoracic vertebrae T1 to T3. Other Features Anteriorly, the prevertebral layer of deep cervical fascia is divided from posterior aspect of the pharynx and its covering, buccopharyngeal fascia, by a potential space referred to as retropharyngeal space.

The trunks of brachial plexus and the subclavian artery emerge between the scalenus anterior and medius muscles covered by per-vertebral fascia and carry a sheath axillary sheath of this fascia along with them to the axilla. The space behind it and in front of vertebrae is prevertebral space. The space in front of it and behind the pharynx is retropharyngeal space. It contains loose areolar tissue and retropharyngeal lymph nodes.

Applied Aspects Pus collected in the prevertebral space usually arise from the caries of cervical vertebrae. Laterally first into the posterior triangle and then along axillary sheath into the axilla. Downwards into superior mediastinum limited by fusion of prevertebral fascia to T3 vertebra.

Pus from the neck infections in front of the prevertebral fascia i. May extend down into the superior mediastinum to posterior mediastinum. Describe briefly Carotid Sheath. Carotid sheath is a tubular condensation of deep cervical fascia around common and internal carotid arteries, internal jugular vein and vagus nerve.

It extends from the base of skull to the arch of aorta. It is thick around the common and internal carotid arteries and thin around internal jugular vein. Ansa cervicalis is embedded in the anterior wall of the carotid sheath. Cervical part of sympathetic chain lies behind the carotid sheath and in front of prevertebral fascia.

Contents of Carotid Sheath are: Common carotid artery till the upper border of thyroid cartilage and internal carotid artery above this level. Internal jugular vein in the entire extent. Vagus nerve in the entire extent it is posterior to the carotid arteries and internal jugular vein.

The superior and inferior cervical cardiac branches, pharyngeal and superior laryngeal branches of vagus arise inside the carotid sheath.

Deep cervical layers of fascia investing dahl investing in stocks

Deep Cervical Fascia - I (Investing Layer)/ Anatomy / Simplified/ Fascia colli

The platysma muscle is divided vertically, and the investing layer of deep cervical fascia is opened along the anterior border of the sternocleidomastoid, allowing it to be mobilized . Aug 07,  · Describe the placement of investing layer of deep fascia of bookmaker.1xbetbookmakerreview.siteg of investing layer of deep is stylomandibular is parotid f. Oct 24,  · It consists of three fascial layers (or sheaths), which are: The investing layer of deep cervical fascia Pretracheal layer of deep cervical fascia The prevertebral layer of .