ANAT 2626 Midterm Class Notes 2

ANAT 2626 Midterm Class Notes 2 - WhitneyCarlson...

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Whitney Carlson Head and Neck Midterm  1 I. Fascia Layers a. Platysma i. Muscle found in the subcutaneous tissue ii. Innervated by the cervical branch of the Facial CN (VII) iii. Draws the corners of the mouth inferiorly and widens it as an expression of sadness b. Investing Fascia i. Splits to enclose two muscles: 1. Sternocleidomastoid a. Innervated by the spinal accessory CN (XI) (SVE) for motor and C2-C3  for sensory b. Unilateral contraction i. Tilts head to same side ii. Rotates it so the face is turned superiorly toward opposite side c. Bilateral contraction i. Extends neck at atlanto-occipital joint ii. Flexes cervical vertebrae so the chin approaches the manubrium iii. Extend superior cervical vertebrae while flexing inferior  vertebrae so chin is thrust forward with head kept level 2. Trapezius a. Innervated by the spinal accessory CN (XI) (SVE) for motor and C3-C4  for sensory b. Elevates, retracts and rotates the scapula c. Elevate the pectoral girdle to maintain the shoulder level against gravity  and resistance d. Depress shoulders  e. Extends the neck f. Lateral flexion of neck ii. deep to the investing layer are the following structures: 1. Omohyoid a. Innervated by C1-C3 branch of the ansa cervicalis b. Depresses, retracts and steadies the hyoid 2. sternohyoid a. Innervated by C1-C3 branch of the ansa cervicalis b. Depresses hyoid after elevation during swallowing 3. strnothyroid a. Innervated by C2-C3 branch of the ansa cervicalis b. Depresses the hyoid and larynx c. Pretrachael fascia of deep cervical fascia i. Trachea
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Whitney Carlson Head and Neck Midterm  2 ii. Esophagus iii. Thyroid gland d. Carotid Sheath i. Located under the SCM ii. Common carotid artery iii. Internal jugular vein iv. Vegas nerve v. Ansa cervicalis N e. Prevertebral fascia of deep cervical fascia (under the carotid sheath) i. Bottom of this fascia is the anterior scalene ii. Can see both the Sympathetic chain and phrenic nerve  iii. Longus coli 1. innervated by C2-C6 2. flexes the neck with rotation to opposite side if acting unilaterally iv. Longus capitis 1. innervated by C1-C3 2. flexes the head v. Anterior Scalene 1. innervated by C4-C6 2. flexes the head vi. Middle Scalene 1. anterior rami of cervical nerves 2. flexes the head laterally 3. elevates the 1 st  rib during forces inspiration vii. Posterior Scalene 1. Innervated by anterior rami of C7-C8 2. flexes the neck laterally 3. elevates 2 nd  rib during forces inspiration II. Main locations a. The brachial plexus and the subclavian artery can be found between the anterior scalene and middle  scalene muscles b. Cervical nerves 5, 7, 9, 10 and 11 carry SVE fibers c. Under the clavicle from superficial to deep
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This note was uploaded on 11/22/2011 for the course ANAT 2626 taught by Professor Ronaldg.mayne during the Winter '11 term at Life Chiropractic College West.

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ANAT 2626 Midterm Class Notes 2 - WhitneyCarlson...

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