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Platysma M.
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Sternocleidomastoid M.
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Post Neck Triangle

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Platysma M. Origin: Inferior border of Mandible. Insertion:fascia of superior pectoralis major/deltoid. Innevation: Cervical branch of fascial nerve (CN VII). Action: draws corners of mouth inferiorly (frowny face)
Sternocleidomastoid M. Origin: Lateral Mastoid process. Insertion: (sternal head): anterior manubrium. (clavicular head): superior medial 1/3 of clavicle. Innervation: Spinal accessory nerve (CN XI). Action: turns face to opposite side.
Anterior Scalene M. Origin: Transverse processes (C3-6). Insertion: Scalene Tubercle of 1st rib. Innervation: C4-6. Action: Flex head (accessory breathing)
Middle Scalene M. Origin: transverse processes C5-7. Insertion: 1st rib, posterior to groove for subclavian artery. Innervation: Cervial spinal nerves. Action: Flexes neck laterally. (accessory breathing).
Posterior Scalene M. Origin: Transverse processes C5-7. Insertion: External border of 2nd rib. Innervation: C7-C8. Action: Flexes neck laterally (accessory breathing).
OmoHyoid M. Origin: Superior border of scapula/ suprascapular notch. Insertion: Inferior border of Hyoid bone. Innervation: C1-3 via Ansa Cervicalis. Action: Depress, retract hyoid bone. **has inferior and superior belly
Splenius Capitis M. Origin: T1-6 spinous processes. Insertion: superior nuchal line/mastoid process. Innervation: Posterior Rami Cervical spinal nerves. Action: Laterally flexes and rotates head.
Levator Scapulae M. Origin: C2-6 Transverse processes. Insertion: Superior angle of scapula/medial border. Action: Downward rotation of the scapula
Spinal Accessory N. CN XI. Passes deep to SCM and then posteroinferiorly within deep cervical fascia on top of levator scapulae. Terminates in the Trapezius M (after superior 2/3).
Great Auricular N. C2-3. ascends vertically across oblique SCM to inferior parotid gland (parallels Ext. Jugular V). Innervates: gland and covering skin, mastoid process, auricle, skin from angle of mandible to mastoid process.
Lesser occipital N. C2. Ascends along posterior border of SCM to the mastiod process behind the ear. Supplies the skin of neck and scalp posterosuperior to auricle.
Transverse Cerival N. C2-3. Curves around the middle of posterior SCM inferior to great auricular N. It moves anteriorly across SCM, deep to the external jugular V and platysma. Supplies: skin covering the anterior cervical region.
Branches from the cervical plexus 1.Lesser occipital N (C2-3). 2.Greater Auricular N (C2-3). 3.Transverse Cervical N (C2-3). 4.Supraclavicular N (C3-4).
Supraclavicular N. C3-4. Common trunk under the inferior SCM, sends cutaneous branches to shoulder, clavicle, and inferior anterior neck.
Phrenic N. C3-5. Contains motor, sensory, and sympathetic nerve fibers. descends down on the anterior scalene. Supplies: Diaphragm (motor and sensory), Mediastinal pleura, pericardium. **recieves communicating fibers from cervical sympathetic ganglia.
External Jugular V. Formed from posterior division of retromandibular v. and posterior auricualr v. near the angle of the mandible. Descends over SCM deep to platysma. Penetrates deep cervical fascia at posteroinferior SCM. Empties into Subclav v. Drains scalp/side of face.
Subclavian V. Drains upper limbs, passing anterior to anterior scalene and phrenic n. It meets with Internal Jugular V at medial Ant. scalene to for brachiocephalic v.
Common Carotid A Ascend in the neck in the common carotid sheath with the Int. Jugular V and the vegas N. Main arterial vessel in the carotid triangle. Forms internal and external carotid A.
External Carotid A. Arises from common carotid at thyroid cartilage in the carotid triangle.
Suprascapular A Arises from the Thyrocervical trunk off the subclavian. Moves laterally over the anterior scalene and phrenic n. It crosses the cords of the brachial plexus to pass through the suprascapular notch. **Supplies supra and infraspinatus M
Occipital A. Arises from posterior aspect of External carotid A. superior to origin of facial A. passes posterior in the occipial groove of temporal bone (parallel to posterior belly of digastric M)
Torticollis Trauma/ prolonged poor posture can cause a shortening of one sternocleidomastoid. Causes rotation and sidebending
Created by: WeeG
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