UNIT 1 SECOND ORDER

Trapezius function

• superior - elevate & superiorly rotate scapula

• middle - retract scapula

• inferior - depress scapula

Trapezius innervation

accessory nerve

Trapezius origin

• occipital bone

• ligamentum nuchae

• vertebrae

Trapezius insertion

• clavicle

• scapula

Latissimus Dorsi function

• agonist of arm extension

• adducts & medially rotates arm

Latissimus Dorsi innervation

thoracodorsal nerve

Latissimus dorsi origin

• thoracic vertebrae

• ribs

• iliac crest

Latissimus dorsi insertion

humerus

Rhomboid Major function

elevates, retracts, & inferiorly rotates scapula

Rhomboid Major innervation

dorsal scapular nerve

Rhomboid major origin

thoracic vertebrae

Rhomboid major insertion

scapula

Teres Minor function

adducts & laterally rotates arm

Teres Minor innervation

axillary nerve

Teres minor origin

scapula

Teres minor insertion

humerus

Supraspinatus function

abducts arm

Supraspinatus innervation

suprascapular nerve

Supraspinatus origin

scapula

Supraspinatus insertion

humerus

Serratus Anterior function

• stabilizes scapula

• agonist in scapula protraction

• superiorly rotates scapula

Serratus Anterior innervation

long thoracic nerve

Serratus anterior insertion

scapula

Serratus anterior origin

ribs

Subscapularis function

medially rotates arm

Subscapularis innervation

upper and lower subscapular nerves

Subscapularis origin

scapula

Subscapularis insertion

humerus

Gluteus Maximus function

extends & laterally rotates thigh

Gluteus Maximus innervation

inferior gluteal nerve

Gluteus maximus origin

• iliac crest

• sacrum

• coccyx

Gluteus maximus insertion

• fascia lata

• linea aspera

• femur

Gluteus Medius function

abducts & medially rotates thigh

Gluteus Medius innervation

superior gluteal nerve

Gluteus medius origin

iliac crest

Gluteus medius insertion

femur

Splenius Capitis function

unilateral fxn- turns head to same side

bilateral fxn - extends neck

Splenius Capitis innervation

cervical spinal nerves

Splenius capitis insertion

occipital or temporal bone

Splenius capitis origin

ligamentum nuchae

Deltoid function

• anterior - flex & medially rotate arm

• middle - agonist of arm abduction

• posterior - extend & laterally rotate arm

Deltoid innervation

axillary nerve

Infraspinatus function

adducts and laterally rotates arm

Infraspinatus innervation

suprascapular nerve

Teres Major function

extends, adducts & medially rotates arm

Rhomboid Minor function

elevates, retracts & inferiorly rotates scapula

Serratus Posterior Superior function

elevates ribs during forced inhalation

Serratus Posterior Inferior function

depresses ribs during forced exhalation

Levator Scapulae function

elevates & inferiorly rotate scapula

Levator Costarum function

elevate ribs

Splenius Cervices function

unilateral fxn- turns head to same side

bilateral fxn - extends neck

Iliocostalis Group function

• unilateral fxn - laterally flexes vertebral column

• bilateral fxn - extends vertebral column, maintains posture

Longissimus Group function

• unilateral fxn - laterally flexes vertebral column

• bilateral fxn- extends vertebral column, maintains posture

Spinalis Group function

bilateral fxn - extends vertebral column, maintains posture

Multifidus function

• unilateral fxn - rotates vertebral column toward the opposite side

• bilateral fxn - extends vertebral column

Rotatores function

• unilateral fxn - rotates vertebral column toward the opposite side

• bilateral fxn - extends vertebral column

Semispinalis Group function

• unilateral fxn - laterally flexes vertebral column and head

• bilateral fxn - extends cervical vertebral column and head

Interspinalis function

extends vertebral column

Intertransversarii function

stabilizes vertebral column

Rectus Capitis Posterior Major function

extends neck, rotation of head to same side

Rectus Capitis Posterior Minor function

extends neck

Oblique Capitis Inferior function

turns head to same side

Oblique Capitis Superior function

turns head to same side, extension of head

Gluteus Minimus function

abducts & medially rotates thigh

Piriformis function

laterally rotates thigh

Superior Gemellus function

laterally rotates thigh

Obturator Internus function

laterally rotates thigh

Inferior Gemellus function

laterally rotates thigh

Quadratus Femoris function

laterally rotates thigh