Muscle Chart

Stylohyoid Origin

Styloid process of temporal bone

Stylohyoid Insertion

Hyoid bone

Stylohyoid Action

Elevates larynx

Sternohyoid Origin

Clavicle & Manubrium

Sternohyoid Insertion

Hyoid bone

Sternohyoid Action

Depresses hyoid bone & larynx

Sternocleidomastoid Origin

Clavicle Head: Clavicle

Sternal Head: Manubrium

Sternocleidomastoid Insertion

Mastoid region of skull

Sternocleidomastoid Action

Flex neck & laterally rotates head

Splenius Capitis Origin

Nuchal ligament & Spinous process C7-T3

Splenius Capitis Insertion

Mastoid process

Splenius Capitis Action

Rotates & Extends Head

Semispinalis Capitis Origin

Superior articular processes of lower cervical vertebrae, transverse process of upper thoracic vertebrae

Semispinalis Capitis Insertion

Occipital bone

Semispinalis Capitis Action

Extends neck

Levator Scapulae Origin

Transverse processes upper cervical vertebrae

Levator Scapulae Insertion

Medial boarder of scapula

Levator Scapulae Action

Elevates and adducts scapula

Latissimus Dorsi Origin

Spinous process of thoracic and lumbar vertebrae

Latissimus Dorsi Insertion

Humerus

Latissimus Dorsi Action

Arm extension, arm adductor, medially rotates arm

Rhomboid Major Origin

Spinous process of thoracic vertebrae (T2-5)

Rhomboid Major Insertion

Medial border of scapula

Rhomboid Major Action

Adducts (retracts) downward rotation of scapula

Rhomboid Minor Origin

Spinous process C7-T1

Rhomboid Minor Insertion

Medial border of scapula

Rhomboid Minor Action

Adducts (retracts) downward rotation of scapula

Longissimus Thoracis Origin

Aponeurosis at transverse process of inferior thoracic/lumber vertebrae

Longissimus Thoracis Insertion

Transverse processes thoracic/lumbar vertebrae and ribs

Longissimus Thoracis Action

Extends and laterally flexes trunk

Spinalis Thoracis Origin

Spinous process of upper lumbar and lower thoracic vertebrae

Spinalis Thoracis Insertion

Spinous processes of superior thoracic vertebrae

Spinalis Thoracis Action

Extends vertebral column

Masseter Origin

Zygomatic arch

Masseter Insertion

Mandibular angle ramus

Masseter Action

Elevates mandible and closes jaw; Mastication