OAINs of Select Muscles

Biceps Brachii Origins

Biceps Brachii Origins

Short Head: Coracoid process of scapula

Long Head: supraglenoid tubercle of scapula

Biceps Brachii Insertions

Radial tuberosity and bicipital aponeurosis

Biceps Brachii Actions

flexes shoulder and elbow and supinates the forearm

Biceps brachii inneravtion

musculocutaneous nerve

Deltoid origins

lateral 1/3 of the clavicle, acromion, and spine of the scapula

Deltoid Insertions

deltoid tuberosity of the humerus

Deltoid Actions

Anterior Fibers: flex and medially rotate the shoulder

Posterior Fibers: extend and laterally rotate the shoulder

All Fibers contracting: abducts shoulder

Deltoid innervation

axillary nerve

diaphragm origins

xiphoid process, costal margin and vertebral bodies L1-3

diaphragm insertions

central tendon of the diaphragm

Diaphragm actions

presses the abdominal viscera inferiorly, increasing the volume of the thoracic cavity

Diaphragm innervations

Phrenic nerve

Gastrocnemius origins

Lateral head: lateral condyle of the femur

Medial Head: medial condyle of the femur

Gastrocnemius insertions

calcaneus

Gastrocnemius actions

knee flexion and plantar flexion in the ankle

Gastrocnemius innervation

tibial nerve

occipitofrontalis origins

occipitalis: superior nuchal line

frontalis: epicranial aponeurosis

occipitofrontalis insertions

occipitalis: epicranial aponeurosis

frontalis: SQ tissue of eyebrows

occipitofrontalis actions

wrinkles forehead and elevates eyebrows

occipitofrontalis innervation

facial nerve

rectus abdominis origins

pubic bone and pubic symphysis

rectus abdominis insertions

xyphoid process and costal cartilages of 5-7

rectus abdominis actions

flexes the trunk

rectus abdominis innervation

intercostals nerve

rhomboid major origins

spinous processes of T2-T5

rhomboid major insertions

medial border of the scapula

rhomboid major actions

retracts the scapula

rhomboid major innervation

dorsal scapular nerve

sartorius origins

ASIS

sartorius insertions

medial surface of the proximal tibia

sartorius actions

flexes, abducts and laterally rotates the hip and flexes knee

sartorius innervation

femoral nerve

serrated anterior origins

surface of the 1st to 8th ribs at the side of the chest

serratus anterior insertions

anterior aspect of the entire medial border of the scapula

serratus anterior actions

protracts the scapula

serratus anterior innervation

long thoracic nerve

sternocleidomastoid origin

sternal head: anterior surface of manubrium

clavicular head: medial 1/3 of clavicle

sternocleidomastoid insertions

mastoid process of temporal bone

sternocleidomastoid actions

unilateral contraction: draws the mastoid process down toward the same side

bilateral contraction: flexes the neck

sternocleidomastoid innervation

spinal accessory nerve

triceps brachii origins

long head: infraglenoid tubercle of scapula

lateral and medial heads: posterior shaft of humerus

triceps brachii insertions

olecranon process of the ulna

triceps brachii actions

extends forearm and the long head helps stabilize the humerus within the shoulder joint

triceps brachii innervation

radial nerve