Flashcards in Neck Muscles and Fascia Deck (47)
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Origin for the Platysma Muscle
Superficial fascia of deltoid and and pectoral regions
1
Insertion of Platysma muscle
Mandible
-->(specifically on the inferior border with some fibers sweeping upward and blending with Risorius)
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What are the 2 actions of the Platysma muscle?
1. Stretches tight the skin of the neck
2. Depress Mandible
3
What nerve and what specific branch innervates the Platysma muscle?
Facial Nerve (CN VII), Cervical branch
4
Origin of the Sternocleidomastoid muscle
Manubrium and Clavicle (medial third of clavicle)
5
Insertion of the Sternocleidomastoid muscle
Mastoid Process and lateral half of superior nuchal line
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What are the two actions of the Sternocleidomastoid muscle?
1. Bilaterally - Flexes neck
2. Individually - draws head to shoulder and turns face to opposite side
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What two nerves innervate the Sternocleidomastoid muscle?
1. Spinal Accessory n.
2. APR of C2 and C3
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Origin of Trapezius muscle
Spines of all thoracic and cervical vertebrae
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Insertion of Trapezius muscle
Spine and Acromion of scapula
Lateral third of clavicle
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What are the two actions of the Trapezius on the head?
1. Bilaterally - extends head
2. Individually - tilts chin to opposite side
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What are the two actions of the Trapezius on the limb girdle?
1. Rotates and adducts scapula
2. Elevates scapula and clavicle
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What innervates the Trapezius?
Spinal Accessory n.
APR of C3 and C4
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Name all eight muscles of the posterior triangle of the neck
Platysma, Sternocleidomastoid, Trapezius, Splenius Capitis, Levator Scapulae, Posterior Scalene, Middle Scalene, Anterior Scalene
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Origin of the Splenius Capitis
Ligamentum Nuchae (lower part) and Cervical Spines (lower)
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Insertion of Splenius Capitis
Mastoid Process and Nuchal Line (superior)
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Two actions of the Splenius Capitis
1. Bilateral - Extends head
2. Individually - Flexes head laterally, rotates head to ipsilateral side
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What innervates the Splenius Capitis muscle?
Segmented PPR of cervical spinal nerves
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What is the origin of the Levator Scapulae muscle
Transverse processes of 4 upper cervical vertebrae
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The Levator Scapulae inserts in only place. What is the insertion?
Scapula (superior portion of the lateral border)
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What is the action of the Levator Scapulae
Elevates and rotates scapula
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What nerve innervates the Levator Scapulae?
Dorsal Scapular Nerve
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Origin of Posterior Scalene muscle
Transverse processes on portion of cervical vertebrae (C5 and C6)
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Insertion of the Posterior Scalene?
Second rib (superior aspect)
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What are the 2 actions of the Posterior Scalene muscle?
1. Bilaterally - Flexes neck
2. Individually - Flexes neck laterally
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Innervation of Posterior Scalene?
APR of C5 to C8
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Origin of the Middle Scalene muscle
Transverse Processes of Cervical portion of vertebrae (C2 to C7)
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Insertion of Middle Scalene
First Rib (Superior aspect)
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What are the two actions of the Middle Scalene?
1. Bilaterally - Flexes Neck
2. Individually - Flexes neck laterally
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