Muscles of the Neck
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30 terms
Terms | Definitions |
|---|---|
 Platysma | Action: raises skin of the neck and also pulls the corner of mouth down, tenses and ridges skin of neck, depresses lower jaw and lip. Most superficial muscle of neck |
| Sternocleidomastoid | Action: draws head toward shoulder and rotates, flexion of head. One of largest and most superficial cervical muscles. Can palpate it, divides neck region into triangles. |
| Digastric | Action: raises hyoid bone and base of tongue, steadies hyoid bone, depresses mandible. Assists in forming triangles of neck. |
| Mylohyoid | Action: elevates hyoid bone or depresses mandible, also forms floor of mouth. Submandibular gland between angle of mandible and mylohyoid. |
| Stylohyoid | Action: elevates hyoid bone and base of tongue |
| Geniohyoid | Action: elevates hyoid bone and tongue and depresses mandible |
| Sternothyroid | Action: depresses the thyroid cartilage and larynx |
| Sternohyoid | Action: depresses larynx and hyoid bone, steadies hyoid bone. Superficial to sternocleidomastoid |
| Omohyoid | Action: steadies hyoid bone, depresses and retracts hyoid and larynx |
| Thyrohyoid | Action: depresses the hyoid and raises the thyroid cartilage and larynx |
| What are the posterior neck muscles? | Trapezius, Semispinalis Capitus, Splenius Capitus and Splenius Cervicus |
| Trapezius | shapes posterior aspect of neck, lifts the clavicle and scapula and extends head and neck |
| Semispinalis Capitus | deep to trapezius. extends the neck and laterally flexes, antagonistic action of sternocleidomastoid |
| Splenius Capitus | immediately deep to trapezius. extends neck, turns head to same side, antagonistic action of sternocleidomastoid |
| Splenius Cervicus | lateral and inferior to splenius. extends the neck, turns head to same side, antagonistic action of sternocleidomastoid |
| Suprahyoid Muscles are: | above the hyoid bone |
| Infrahyoid Muscles are: | below the hyoid bone |
| Suprahyoid Muscles | elevate hyoid, depress mandible |
| What are the suprahyoid muscles? | digastric, geniohyoid, mylohyoid, stylohyoid |
| Infrahyoid muscles | elevate or depress larynx |
| What are the infrahyoid muscles? | sternohyoid, omohyoid, sternothyroid, thyrohyoid |
| Anterior Triangle and Posterior Triangle are divided by: | sternocleidomastoid muscle |
| Anterior Triangle is composed of: | submental triangle, submandibular triangle, muscular triangle, carotid triangle |
| Posterior Triangle is composed of: | occipital triangle and supraclavicular triangle |
| Submental Triangle | between anterior bellies of digastric, tip of chin |
| Submandibular Triangle | bordered by mylohyoid, hyoglossus, stylohyoid and digastric |
| Muscular Triangle | infrahyoid region area below omohyoid |
| Carotid Triangle | omohyoid, sternocleidomastoid and digastric |
| Occipital Triangle | trapezius, sternocleidomastoid, omohyoid muscle |
| Supraclavicular Triangle | above clavicle, omohyoid and trapezius muscle |
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