LATERAL CERVICAL TRIANGLE

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LATERAL CERVICAL TRIANGLE
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Superficial Cervical Fascia

• Contains
• Platysma muscle
• Superficial veins
• Cutaneous nerves

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Prevertebral Fascia

• Covers
• Muscles of the lateral triangle
• Extends
• Around anterior surface of the cervical
  vertebrae across anterior midline.

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Boundaries of Triangle

• Anterior
• Posterior border of the sternocleidomastoid
• Posterior
• Anterior border of the trapezius
• Inferior
• Clavicle
• Moore Fig. 6.29

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Roof of Triangle

• Skin
• Superficial layer of deep cervical fascia
• Also called investing fascia.
• Splits to enclose
• Trapezius
• Sternocleidomastoid

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Muscular Floor Triangle

• Prevertebral fascia covers muscular floor
  consisting of
• Splenius capitis
• Levator scapulae
• Scalenus posterior
• Scalenus medius
• Scalenus anterior
• Omohyoid

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Nerves of Triangle

• Lesser occipital (C2)
• Supraclavicular (C3,4)
• Accessory (CN XI)
• To trapezius and sternocleidomastoid

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Vessels of Triangle

• Occipital artery
• Transverse cervical artery
• Subclavian vein
• Crosses first rib
• Subclavian artery
• Crosses first rib
• External jugular vein

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Spinal Accessory Nerve

• Spinal root
• Arises from C1-C5.
• Fibers pass superiorly through foramen magnum
  and join cranial root.
• Cranial root
• Arises from medulla.

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Spinal Accessory Nerve

• Both roots exit through jugular foramen and
  separate.
• Spinal root innervates
• Sternocleidomastoid
• Trapezius