Muscle O, I, A and I

trapezius origin

external occipital protuberance

superior nuchal line

spinous processes of C7-T12

trapezius insertion

lateral 1/3 of clavicle

acromion and spine of scapula

trapezius action

elevates (upper fibers) and depresses shoulder (lower fibers)

retracts scapula

extends head

trapezius innervation

accessory

latissimus dorsi origin

spines of T6-T12

thoracolumbar fascia

iliac crest

latissimus dorsi insertion

intertubercular (bicipital) groove

latissimus dorsi action

adducts, extends and medially rotates arm

latissimus dorsi innervation

thoracodorsal

levator scapulae origin

transverse processes of C1-C4

levator scapulae insertion

superior angle and medial border of scapula

levator scapulae action

elevates and adducts scapula

levator scapulae innervation

dorsal scapular

rhomboid minor origin

spines of C7 and T1

rhomboid minor insertion

medial border of scapula around the root of spine

rhomboid minor action

elevates and adducts scapula

rhomboid minor innervation

dorsal scapular

rhomboid major origin

spines of T2-T5

rhomboid major insertion

medial border of scapular inferiorly of root of spine

rhomboid major action

elevates and adducts scapula

rhomboid major innervation

dorsal scapular

Splenius origin

vertebral spines of T1-T4

Splenius insertion

splenius capitis: occipital and temporal bones

splenius clavicular: transverse processes of C2-C3

Splenius action

extend neck and head, rotate in unilateral action

Splenius innervation

dorsal rami

iliocaostalis origin

from ilium and ribs

iliocaostalis insertion

to ribs and transverse processes

iliocaostalis action

extend trunk and vertebral column

iliocaostalis innervation

dorsal rami

longissimus origin

from transverse processes of vertebrae

longissimus insertion

to transverse process

longissimus action

extend trunk and vertebral column

longissimus innervation

dorsal rami

spinalis origin

from spinous processes

spinalis insertion

to spinous process

spinalis action

extend trunk and vertebral column

spinalis innervation

dorsal rami

semispinalis origin

transverse process of vertebrae

semispinalis insertion

extends across 5-6 vertebrae

semispinalis action

extend trunk in bilateral action and rotate vertebral column in unilater action

semispinalis innervation

dorsal rami

multifidus origin

transverse process

multifidus insertion

extend across 3-4 vertebrae

multifidus action

extend trunk in bilateral action and rotate vertebral column in unilateral action

multifidus innervation

dorsal rami

rotatores origin

transverse process

rotatores insertion

extend across 1-2 vertebrae

rotatores action

extend trunk in bilateral action and rotate vertebral column in unilateral action

rotatores innervation

dorsal rami

what borders make up the triangle of auscultation

superior border of latissimus dorsi, lateral border of trapezius, medial border of rhomboid

levatores costarum origin

trasnverse process of ribs C7-T11

levatores costarum insertion

rib one and two levels below

levatores costarum innvervation

segmented dorsal rami

levatores costarum action

elevate ribs during inhalation

serratus posterior superior origin

spinous processes of C7-T3

serratus posterior superior insertion

2 and 5 rib

serratus posterior superior action

elevate ribs during inhalation

serratus posterior inferior origin

spinous processes of T11-L2

serratus posterior inferior insertion

8th-12th rib

serratus posterior inferior action

depress ribs during inhalation

serratus posterior inferior innervation

segmental intercostal

serratus posterior superior innervation

segmental intercostal