OINA's 1 - Table 5.2 - Muscles of Post. Triangle Flashcards
Platsyma - Origin
Superficial fascia of deltoid and pectoral regions
Platysma - Insertion
Inferior border of mandible, some fibers sweep upward and blend with risorius
Platysma - Action
Stretches tight the skin of the neck, depresses mandible
Platysma - Innervation
Facial nerve (VII) - cervical branch
Sternocleidomastoid - Origin
Manubrium and clavicle
Sternocleidomastoid - Insertion
Mastoid process and superior nuchal line
Sternocleidomastoid - Action
Bilateral: flexes neck
Individually: draws head to shoulder, turns face to opposite side
Sternocleidomastoid - nerve
Spinal accessory nerve, APR of C2 and C3
Trapezius - origin
Spines of all thoracic and cervical vertebrae
Ligamentum nuchae
Inion
Superior nuchal line
Trapezius - insertion
Spine and acromion of scapula
Clavicle
Trapezius - action
Head
- Bilateral: extends head
- Individually: Flexes head to same side
Limb girdle
- Rotates and adducts scapula, elevates scapula and clavicle
Trapezius - nerve
Spinal accessory APR of C3 and C4
Splenius capitis - origin
Ligamentum nuchae
Cervical spines
Splenius capitis - insertion
Mastoid process
Superior nuchal line
Splenius capitis - action
Bilateral: extends head
Individualy: flexes head laterally, rotates head to ipsilateral side
Splenius capitis - nerve
Segmented PPR of cervical spinal nerves
Levator scapulae - origin
Transverse processes of cervical vertebrae
Levator scapulae - insertion
Scapula
Levator scapulae - action
Elevates and rotates scapula
Levator scapulae - nerve
Dorsal scapular nerve
Scalenus posterior - origin
Transverse processes of cervical vertebrae
Scalenus posterior - insertion
Second rib
Scalenus posterior - action
Bilateral: flexes neck
Individually: flexes neck laterally
Scalenus posterior - nerve
APR of C5 to C8
Scalenus medius - origin
Transverse processes of cervical vertebrae
Scalenus medius - insertion
First rib
Scalenus medius - action
Bilateral: flexes neck
Individually: flexes neck laterally
Scalenus medius - nerve
APR of C3 and C4
Scalenus anterior - origin
Transverse processes of cervical vertebrae
Scalenus anterior - insertion
First rib
Scalenus anterior - action
Bilateral: flexes neck
Individually: flexes neck laterally
Scalenus anterior - nerve
APR of C5 to C8
This one is for Casey Gooch. (Flip for message)
Wake up, Casey! You still have more OINA’s to learn.
You don’t have time to sleep - you’re taking anatomy.
- Diewitt
