Muscle Actions

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BICEPS BRACHII
origin: suraglenoid tubercle, coroid process of scapula
insertion: radial tuberosity of radius
innervation:musculocutaneous
action: flexion of arm
https://en.wikipedia.org/wiki/Biceps


BICEPS FEMORIS
origin: ischial tuberosity, linea aspera of femor
 insertion: head of fibula and lateral condyle of tibia
innervation: tibial and fibular nerves
action: flexion of the leg with thigh extension
https://en.wikipedia.org/wiki/Biceps_femoris


BRACHIORADIALIS
origin: lateral border of distal end of humerous
insertion:superior to styloid process of radius
innervation: radial nerve
action: flexion of forearm
https://en.wikipedia.org/wiki/Brachioradialis


DELTOID
origin: acromion of scapula, spine of scapula
insertion: deltoid tuberosity of humerous
innervation: axillary nerve
action: abducts, flexes, extends medial and lateral rotates humerous
https://en.wikipedia.org/wiki/Deltoid_muscle


INTERNAL OBLIQUE
origin:illiac crest, inguinal ligament, thoracolumbar fascia
insertion: cartliage of ribs 7-10, linea alba
innervation: thoraic nerves (T8-T12), iliohypogastric nerve, ilioinguinal nerve
action: compresses abdomen and spine
https://en.wikipedia.org/wiki/Internal_oblique

LATISSIMUS DORSI
origin:spinal processes T7-L5, lumbar vertebrae, crests of sacrum, illium
insertion:intertubercular sulcus of humerous
innervation:thoracodorsal nerve
action:extends, adducts, medially rotates humerous
https://en.wikipedia.org/wiki/Latissimus_dorsi


LEVATOR SCAPULAE
origin:transverse processes of C1-C4
insertion:superior vertebral border of scapula
innervation: accessory (XI) and cervical spinal nerves C3-C5
action: elevates scapula
https://en.wikipedia.org/wiki/Levator_scapulae


GLUTEUS MEDIUS
origin: illium
insertion: greater trochanter of femur
innertion:superior gluteal nerve
action: abducts and medially rotates femur
https://en.wikipedia.org/wiki/Gluteus_medius


GASTROCNEMIUS
 origin:later and medial condyles of femur and capsule of kneww
insertion: calcaneus by way of achilles tendon
innervation:tibial nerve
action:flexes leg; plantar flexes foot
https://en.wikipedia.org/wiki/Gastrocnemius


PLATYSMA
origin:fascia over deltoid and pectoralis major muscles
insertion:mandible
innervation:facial (VII) nerve
action:depression of mandible
https://en.wikipedia.org/wiki/Platysma


SOLEUS
head of fibula and medial border of tibia
insertion: calcaneus by way of achilles tendon
innervation: tibialnerve
action:plantar flexes foot
https://en.wikipedia.org/wiki/Soleus


SERRATUS ANTERIOR
origin:superior eight or nine ribs
insertion:vertebral border and inferior angle of scapula
innervation:long thoracic nerve
action:rotates scapula
https://en.wikipedia.org/wiki/Serratus_anterior


SCALENES
origin:transverse process of C3-C6
insertion: 1st and 2nd rib
innervation:cervical spine nerve
action:assists in inspiration
https://en.wikipedia.org/wiki/Scalenes


SUBSCAPULARIS
origin:subscapular fossa of scapula
insertion:lesser tubercle of humerus
innervation:upper and lower subscapular nerve
action:medially rotates humerus
https://en.wikipedia.org/wiki/Subscapularis


TENSOR FASCIA LATA
origin: illiac crest
insertion: tibia
innervation:superior gluteal nerve
action:abduction of thigh
https://en.wikipedia.org/wiki/Tensor_fascia_lata


TRANSVERSE ABDOMINIS
origin:illiac crest, inguinal ligament, lumbar fascia
insertion: xiphoid process, linea alba, pubis
innervation: thoracic spinal nerves (T8-T12), iliohypogastric nerve, ilioguinal nerve
action: compresses abdomen
https://en.wikipedia.org/wiki/Transverse_abdominis


OCCIPITOFRONTALIS
origin: epicranal aponeurosis, occip[ital bone, mastoid process of temporal bone
insertion: epicranial aponeurosis, skin superior to suborbital margin
innervation: facial (VII) nerve
action: draw scalp anteriorly/ posteriorly
https://en.wikipedia.org/wiki/Occipitofrontalis


ORBICULARIS ORIS
origin: muscle fiber surrounding mouth
insertion: skin at corner of mouth
innervation: facial (VII) nerve
action: closes and protrudes the upper lips for kissing
https://en.wikipedia.org/wiki/Orbicularis_oris


STERNOCLEIDOMASTOID
origin: manubrium of sternum, medial third of clavicle
insertion: mastoid process of temporal bone, lateral half of superior nuchal line of occipital bone
innervation: accessory (XI) nerve
action: flexes neck
https://en.wikipedia.org/wiki/Sternocleidomastoid