Skeletal Muscles

All 62 muscles and their OIA

Sternocleidomastoid

O: Sternum and clavicle

I: Mastoid process

A: Neck flexion, opposite rotation

Temporalis

O: Temporal fossa

I: Coronoid process

A: Elevates and retracts mandible

Masseter

O: zygomatic arch

I: Mandible

A: Elevates mandible

Zygomaticus major

O: Zygomatic bone

I: Corner of mouth

A: Elevates corner of mouth

Buccinator

O:Maxilla and mandible

I: Orbicularis oris

A: Compresses cheek

Occipitofrontalis

O: Skull (occipital and frontal)

Orbicularis Oculi

O: Medial orbit

I: Skin around eye

A: Closes eyelids

Orbicularis Oris

O: Maxilla and mandible

I: Lips

A: Closes and protrudes lips

Platysma

O: Chest fascia

I: Mandible and lower lip

A: Tenses neck, depresses lower lip

Superior Rectus

O: Common tendinous ring

I: Superior sclera

A: Elevates, adducts, rotates medially

Inferior Rectus

O: Common tendinous ring

I: Inferior sclera'

A: Depresses, adducts, rotates laterally

Lateral Rectus

O: Common tendinous ring

I: Lateral sclera

A: Abducts eye

Medial Rectus

O: Common tendinous ring

I: Medial sclera

A: Adducts eye

Superior Oblique

O: Sphenoid

I: Superior/lateral sclera

A: Dlevates, abducts, rotates medially

Inferior Oblique

O: Maxilla

I: Inferior/lateral sclera

A: Elevates, abuts, rotates laterally

Diaphragm

O: Ribs, sternum, lumbar spine

I: Central tendon

A: Inspiration, breathing

Rectus Abdominis

O: Pubis

I: Xiphoid and costal cartilages

A: Flexes trunk

External Oblique

O: Ribs #5-12

I: Linea alba and pelvis

A: Trunk flexion, opposite rotation

Internal Oblique

O: Iliac crest and inguinal lig

I: Ribs and linea alba

A: Flexes trunk, same side rotation

Erector spinae

O: sacrum and iliac crest

I: Ribs and vertebrae

A: Extends and abdomen flexes spine

Trapezius

O: Skull and vertebrae

I: clavicle and scapula

A: Moves, elevates, and retracts scapula

Rhomboid Major

O: T2-TS vertebrae

I: Medial scapula

A: Retracts and downwardly rotates scapula