Term
| Which two triangles of the neck make up the Posterior triangle? |
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Definition
Occipital triangle
Subclavian triangle |
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Term
| What are the boundaries of the Occipital triangle? |
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Definition
•Anterior-sternocleidomastoid m.
•Posterior- trapezius muscle
•Inferior- inferior belly of omohyoid m |
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Term
| What are the boundaries of the Subclavian triangle? |
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Definition
•Anterior-sternocleidomastoid m.
•Superior- inferior belly of omohyoid m.
•Inferior-clavicle |
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Term
| Platysma muscle (OIIA)-very thin |
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Definition
*Origin: Fascia and skin below clavicle
*Insertion: Lower border of mandible, skin of face
*Innervation: Facial nerve (CN VII)
*Action: Tense skin of neck, draws corner of mouth downward, may assists in depressing (down) mandible |
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Term
| Sternocleidomastoid m. (OIIA) |
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Definition
*Origin: Manubrium (part of sternum), medial clavicle
*Insertion: mastoid process of temporal bone
*Innervation: Spinal accessory nerve (CN XI)
*Action: Unilaterally, tilts head to same side, rotates face upward to opposite side. Bilaterally, anterior fibers flex head (chin to chest), posterior fibers extend head on trunk (head comes up) |
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Term
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Definition
*Origin: superior border of scapula, just medial to scapular notch
*Insertion: hyoid bone
*Innervation: Ansa cervicalis (C 1-3)
*Action: depress hyoid bone |
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Term
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Definition
*Origins - Transverse processes of cervical vertebrae (C3-C6)
*Insertions – Scalene tubercle 1st Rib
*Innervations and Blood Supply – VPR (C4-C6)
*Actions – Elevates 1st Rib, Laterally flexes and rotates neck |
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Term
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Definition
*Origins – transverse processes of cervical vertebrae (C1-C7)
*Insertions – Insertion: on first rib posterior to scalenus anterior
*Innervations and Blood Supply – VPR (C3 – C8)
*Actions – Flexes neck laterally, elevates 1st rib during forced inspiration |
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Term
| Scalenus Posterior (OIIA) |
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Definition
*Origins – Transverse processes of cervical vertebrae (C4-C6)
*Insertions – 2nd Rib
*Innervations and Blood Supply – VPR (C5-C7)
*Actions – Flexes neck laterally, elevates 2nd rib during forced inspiration |
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Term
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Definition
*Origins – 1st Rib
*Insertions – Inferior surface of the clavical
*Innervations and Blood Supply – DPR (C5 – C6)
*Actions – Anchors and depresses clavicle |
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