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Chapter 6 Muscles

Muscles of the neck and scapula

MuscleAttachment 1 (origin)Attachment 2 (insertion)Action 1Action 2Other actionsInnervation
Sternocleidomastoid Manubrium of sternum; clavicle Mastoid process of temporal bone Neck flexion Lateral flexion of the neck and head Contralateral rotation of the neck and head Spinal Accessory Nerve (cn 11)
Platysma Pectorlis major and deltiod Mandible Depresses lower lip and jaw neck flexion Cervical branch of Facial Nerve (cn 7)
Scalenes Transverse processes of cervical vertebrae 1st and 2nd rib Elevate first two ribs Assist in neck flexion Lateral flexion of neck Cervical spinal nerves
Splenius capitis Nuchal ligament and spinous processes of C7 to T4 Occipital bone and mastoid process Extension of the head and neck Ipsilateral rotation of the head and neck Lateral flexion of the head and neck Cervical spinal nerves
Trapezius (the "traps") Occiput, Nuchal ligament, and Spinous Processes of C7 to T12 Lateral clavicle, Acromion process, and Spine of the scapula Upper: Elevation and upward rotation of the scapula Middle: retraction of the scapula Lower: depression, upward rotation of the scapula Spinal Accessory Nerve (cn 11)
Levator scapulae Transverse processes of C3 and C4 Medial border of the scapula Elevation of the scapula Downward rotation of the scapula Dorsal scapular nerve
Rhomboid major and minor Spinous processes of C7 to T5 Medial border of the scapula Retraction of the scapula Downward rotation of the scapula Elevation of the scapula Dorsal scapular nerve
Serratus anterior Ribs 1-9 Anterior surface of the medial border of the scapula Protraction (abduction) of the scapula Upward rotation of the scapula Long Thoracic Nerve
Pectoralis minor Ribs 3-5 Coracoid process of the scapula Protraction (abduction) of the scapula Depression of the scapula Downward rotation of the scapula, Elevation of ribs 3-5 Medial and lateral pectoral nerves
Suboccipitals C1 and C2 Occiput Postural muscles Suboccipital nerve
Infrahyoids Hyoid bone Sternum, thyroid cartilage, scapula, and clavicle Depression of the hyoid bone Cervical Plexus, Hypoglassal Nerve (cn 12)
Suprahyoids Hyoid bone Temporal bone, mandible Elevation of the hyoid bone Trigeminal Nerve (cn 5), Facial Nerve (cn 7) , Hypoglossal nerve (cn 12)
Stylohyoid styloid proces hyoid bone elevates hyoid (blank) (blank) facial nerve
Mylohyoid mandible hyoid bone elevates hyoid (blank) (blank) alveolar nerve
Geniohyoid mandible hyoid bone elevates hyoid (blank) (blank) alveolar nerve
Sternohyoid manubrium hyoid bone depresses hyoid (blank) (blank) cervical spinal nerve
Thyrohyoid thyriod cartilage hyoid bone depresses hyoid (blank) (blank) cervical spinal nerve
Longus Capitis Cervical vertebrae Occipital bone flexs- rotates the head (blank) (blank) cervical spinal nerve
Longus Colli Thoracic vertebrae 1, 2 cervical vertebrae 5, 6 bends neck forward (blank) (blank) cervical spinal nerve
Scalenus Anterior cervical vertebrae first rib bend cervical forward (blank) (blank) cervical spinal nerve
Scalenus Posterior cervical vertebrae second rib bend cervical (blank) (blank) cervical spinal nerve
Created by: skpoem