unit 1 lecture FUNCTIONS

deltoid action

anterior: flex and medially rotate arm middle: agonist of arm abduction posterior: extend and laterally rotate arm

deltoid innervation

axillary nerve

infraspinatus action

laterally rotates and adducts arm

infraspinatus innervation

suprascapular nerve

teres major

extends, adducts, and medially rotates arm

rhomboid minor

elevates, retracts, and inferiorly rotates scapula

serratus posterior superior

elevates ribs during forced inhalation

serratus posterior inferior

depresses ribs during forced exhalation

levator scapulae

elevates and inferiorly rotates scapula; laterally flexes neck

levator costarum

elevates ribs

splenius cervices

unilateral: turns head to same side

bilateral: extends neck

iliocostalis group

unilateral: laterally flexes vertebral column

bilateral: extends vertebral column, maintains posture

longissimus group

unilateral: laterally flexes vertebral column

bilateral: extends vertebral column, maintains posture

spinalis group

bilateral: extends vertebral column, maintains posture

multifidus action

unilateral: rotates vertebral column to opposite side

bilateral: extends vertebral column

rotatores

unilateral: rotates vertebral column towards opposite side

bilateral: extends vertebral column

semispinalis group

unilateral: laterally flexes vertebral column and head

bilateral: extends cervical vertebral column and head

interspinales

extends vertebral column

intertransversarii

stabilizes vertebral column

rectus capitis posterior minor

extends neck

rectus capitis posterior major

extends neck

oblique capitis inferior

turns head to same side

oblique capitis superior

turns head to same side

gluteus minimus

abducts and medially rotates thigh

piriformis

laterally rotates thigh

superior gemellus

laterally rotates thigh

obturator internus

laterally rotates thigh

inferior gemellus

laterally rotates thigh

quadratus femoris

laterally rotates thigh

trapezius

elevate, retract, depress scapula

lattisimus dorsi

extends, agonist of arm abduction, and medially rotates arm

rhomboid major

elevates, retracts, and inferiorly rotates scapula

teres minor

laterally rotates and adducts arm

supraspinatus

abducts arm

serratus anterior

protracts, superiorly rotates, stabilizes scapula

subscapularis

medially rotates arm

splenius capitis

unilateral: turns head to same side

bilateral: extends neck

gluteus maximus

agonist of thigh extension and laterally rotates thigh

gluteus medius

abducts and medially rotates thigh