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DEEP CERVICAL FASCIA

DEEP CERVICAL FASCIA. Posses three layers from outside inwards Investing layer Pretracheal fascia Prevertebral fascia Bucccopharyngeal fascia Pharyngo-basilar fascia Carotid sheath. Investing layer. C7. Investing layer. Lies under cover of platysma Attachments

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DEEP CERVICAL FASCIA

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  1. DEEP CERVICAL FASCIA

  2. Posses three layers from outside inwards • Investing layer • Pretracheal fascia • Prevertebral fascia • Bucccopharyngeal fascia • Pharyngo-basilar fascia • Carotid sheath

  3. Investing layer C7

  4. Investing layer • Lies under cover of platysma • Attachments Behind – ligamentum nuchae and the seventh cervical spine In front – continuous with the similar layer of the opposite side across the midline and attached to the Hyoid bone and symphysis menti

  5. Above– (behind forwards ) • External occipital protuberance, superior nuchal line • Mastoid process • Cartilagenous part of external ear • Lower margin of zygomatic arch • Lower border of mandible

  6. Above– (behind forwards )

  7. Below- (behind forwards ) • Spine and acromial process of scapula • Upper surface of clavicle • Manubrium

  8. Horizontal extent • Splits twice to enclose the trapezius and sternomastoid muscles • Forms roof for posterior and anterior triangle

  9. Investing layer - Horizontal extent Strap muscles Sternocleidomastoid • At the lateral border of strap muscles it splits and covers it Trapezius

  10. Vertical extent • Splits to enclose the submandibular and parotid glands • Cranially it forms the stylomandibular ligament • Caudally it encloses the supra sternal and supraclavicular spaces

  11. Investing layer presents everything two • Encloses trapezius and sternomastoid muscles • Encloses two glands, parotid and submandibular glands • Splits to enclose two spaces- suprasternal and supraclavicular spaces

  12. Thickened twice to form parotido-masseteric fascia and stylomandibular ligament • It forms pulleys to bind the tendons of digastric and omohyoid muscle

  13. PRETRACHEAL FASCIA

  14. Attachments • Superiorly: attaches to hyoid bone, oblique line of thyroid cartilage and cricoid cartilage • Inferiorly: blends with arch of aorta • On each side: fuses with carotid sheath

  15. Ligament of berry which is a fascial sling connects the thyroid to cricoid cartilage • Splits to enclose the thyroid gland and continuous with the layer of opposite layer • Provides slippery surface for trachea

  16. Pretracheal: vertical extent

  17. PREVERTEBRAL FASCIA

  18. Attachments • Superiorly to the bones of base of the skull • Inferiorly to the anterior longitudinal ligament and body of fourth thoracic vertebra • Anteriorly it is related to retropharyngeal space

  19. Forms axillary sheath around the trunks of brachila plexus and subclavian artery • Forms floor of posterior triangle • Cervical plexus and brachial plexus lie beneath it

  20. CAROTID SHEATH • Tubular investment of deep cervical fascia • Extends from base of the skull to AOA Contents: • Common & Int.carotid arteries- medially • Internal jugular vein – laterally • Vagus nerve – b/w & behind the vessels

  21. Rami of ansa cervicalis is embedded in anterior wall • Thickened over arteries but ill defined over vein

  22. Buccopharyngeal fascia • Pharyngobasilar fascia

  23. Applied Anatomy • Painful parotid swellings • Thyroid swellings move with deglutition • Neck infections – infront / behind prevertebral fascia - retropharyngeal abscess • Air embolism of external jugular vein

  24. Thank you

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