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25 Cards in this Set
- Front
- Back
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What divides the neck into anterior and posterior regions?
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Sternocleidomastoid
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What is the base of the posterior cervical triangle?
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Middle 1/3 of the clavicle
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What is the posterior boundary of the posterior cervical triangle?
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Trapezius
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What is the anterior boundary of the posterior cervical triangle?
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Sternocleidomastoid
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What is the roof of the posterior cervical triangle?
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skin, superficial fascia (containing a portion of the platysma) and the investing fascia with spinal accessary n CN XI therein
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What is the floor of the posterior cervical triangle?
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Splenius capitis
levator scapulae Posterior scalene Anterior scalene Middle scalene |
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Where does the SCM originate?
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Manubrium and medial 1/3 of the clavicle
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Where does the SCM insert?
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Mastoid process and lateral 1/2 of superior nuchal line of the skull (occipital region)
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SCM action
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Unilaterally- rotates and draws head to shoulder
Bilaterally- flexes cervical column |
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Innervation of SCM
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Spinal accessory nerve XI
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Contents of the posterior cervical triangle
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1. spinal accessary nerve XI
2. Omohyoid m. 3. External jugular v. 4. Axillary v. 5. R subclavian a. 6. Occipital a 7. Brachial plexus 8. Lesser Occipital n (C2, C3) 9. Great Auricular n (C2, C3) 10. Transverse cervical n (C2, C3) 11. 3 Supraclavicular n (C3, C4) 12. Several lymph nodes |
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How many origins does the spinal accessary nerve have? Explain.
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2 roots
Cranial root- motor accessary to CN X Spinal root- Fibers from VPR of C2 (SCM) and fibers from VPR of C3 and C4 (Trap) |
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What does C2 supply?
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SCM
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What does C3, C4 supply?
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Tapezius
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What divides the posterior cervical triangle into 2 subdivisions?
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Omohyoid
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What are the two subdivisions of the posterior cervical triangle called?
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Occipital triangle- sup to omohyoid
Supraclavicular triangle- inf to omohyoid |
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Where does the omohyoid originate?
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medial lip of suprascapular notch
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Where does the omohyoid insert?
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lower border of the body of the hyoid
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Action of omohyoid?
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Steadies hyoid,
depressed and retracts hyoid and larynx |
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What is the omoyoid innervated by?
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Ansa Cervicalis (C2 and C3) the motor part of the cervical plexus
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What lies superficial to the SCM
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External jugular v
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What is the external jugular v drain into?
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Subclavian v
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What drains into the external jugular v?
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Retromandibular
posterior auricular v transverse cervical v suprascapular v anterior jugular v |
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What does the axillary v continue as, as it crosses the lateral borders of the first rib?
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Subclavian v
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Where does the subclavian vein pass?
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anterior to the 1st rib and the ant. scalene muscle
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