Human Body Muscles.docx - Facial Muscles Masseter o Action...

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Facial Muscles: Masseter o Action: prime mover of jaw closure Orbicularis Oculi o Action: closes eye Orbicularis Oris o Action: closes lips Corrugator Supercilii o Action: draws eyebrows medially and inferiorly Buccinator o Action: compresses cheek Epicranius o Frontalis Action: raises eyebrows o Occipitalis Action: pulls scalp posteriorly Zygomaticus (major and minor) o Action: draws corners of lips upwards Temporalis o Action: closes jaw Levator Labii Superioris o Action: opens lips Depressor Labii Inferioris o Action: draws lip inferiorly Mentalis o Action: wrinkles chin Medial Pterygoid o Action: aids in grinding movements of teeth Lateral Pterygoid o Action: aids in grinding movements of teeth Depressor Anguli Oris o Action: draws corners of mouth downward and laterally Risorius o Action: draws corner of lip laterally Nasalis
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o Action: flares nostrils Platysma o Action: tenses skin of neck Muscles of the Neck and Throat (Suprahyoid Muscles) Digastric (anterior and posterior bellies) o Action: elevates hyoid bone Stylohyoid Mylohyoid (Infrahyoid Muscles) Sternohyoid Sternothyroid Omohyoid Thyrohyoid Muscles of the Neck and Vertebral Column Sternocleidomastoid o Origin: sternum and clavicle o Insertion: mastoid process of temporal bone o Action: prime mover of head flexion Scalenes (anterior, middle, posterior) o Origin: posterior tubercle of the transverse process of cervical vertebrae o Insertion: ribs 1 and 2 o Action: elevate/depresses ribs 1 and 2 (during inspiration and expiration) (Intrinsic muscles of back) Splenius (capitis, cervicis) o Capitis o Origin: lower portion of ligamentum nuchae, spinous processes of C7-T3
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o Insertion: superior nuchal line of occipital bone, mastoid process of temporal bone o Action: bilateral contraction - extend head and neck; unilateral - laterally bend head and neck to the contracted side o Cervicis o Origin: T3-T6 spinous processes o Insertion: C1-C3 transverse processes o Action: bilateral contraction - extend head and neck; unilateral - laterally bend head and neck to the contracted side (Deep Muscles of back) Erector spinae (iliocostalis, longissimus, spinalis) Semispinalis o Action: group: extend head and vertebral column Quadratus Lumborum Muscles of the Thorax, Shoulder, Ab Wall Pectoralis Major o Origin: clavicle, sternum and costal cartilages 1-6, rectus sheath o Insertion: lateral lip of intertubercular sulcus of humerus o Action: prime mover of arm flexion Deltoid o Origin: clavicle, acromion, scapular spine o Insertion: deltoid tuberosity of humerus o Action: prime mover of arm abduction Pectoralis minor o Origin: anterior surface of ribs 3-5 near costal cartilages o Insertion: coracoid process of scapula
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