Muscles of Head and Truck

Temporalis

Frontalis

Occipitalis

Masseter

Platysma

Zygomaticus

Orbicularis oris

Orbicularis oculi

Sternohyoid

Internal oblique

Transversus abdominis

Intercostals

Infraspinatus

Rhomboid major

Stenocleidomastoid

O: Sternum, Clavicle

I: Mastoid process

A: Flex & Rotate head

Trapezius

O: Occipital bone, spinous processes C17-T12

I: Acromion, spin of scapula, clavicle

A: Extend head, raising shoulders

Serratus anterior

O: Lateral ribs 1-8

I: Medial boarder of scapula

A: Holds scapula to chest wall

Pectoralis minor

O: Ribs 3-5

I: Coracoid process of scapula

A: Draws scapula forward and inferiorly

Pectoralis major

O: Clavicle, sternum, cartilages of ribs 1-6

I: Intertubercular groove of humerus

A: Flexion, adduction, internal rotation

Latissimus Dorsi

O: spinous processes of T6 - L5, ribs 8-12, iliac crest

I: Intertubercular groove of humerus

A: Extension, adduction, rotation of arm

Rectus abdominis

O: Pubic crest and symphysis

I: Xiphoid process, cartilages of ribs 5-7

A: Flexes, rotates trunk

External oblique

O: last 8 ribs

I: Linea alba, pubic crest, iliac crest

A: Compresses the abdominal wall, trunk rotation, internal flexion