Muscles of Inspiration - Origin, Insertion, and Action

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Internal Intercostal Muscles (chondral portion) : Origin

Ribs 1-11

Levatores Costarum, Brevis Portion : Origin

Transverse process of C7-T11

External Intercostal Muscles : Insertion

Upper surface of rib immediately below

levatores costarum, longus portion : insertion

bypass the rib below the point of origin and inserts onto the next rib

Diaphragm : Insertion

central tendon

subclavius : origin

clavicle

pectoralis minor : insertion

coracoid process of scapula

subclavius : action

elevates rib

pectoralis major : insertion

greater tubercle of humerus

Diaphragm : Origin

inferior boundary of rib cage, xiphoid process, posterior vertebral column

External Intercostal Muscles : Origin

lower surface of each rib (except 12)

sternocleidomastoid : origin

mastoid process of the temporal bone (on skull)

Diaphragm : Action

pulls central tendon down and forward during inspiration

scalenus (anterior, middle, and posterior) : insertion

ribs 1-2

serratus anterior : origin

ribs 1-9

pectoralis minor : origin

ribs 2-5

serratus posterior superior : insertion

ribs 2-5

levator scapulae : insertion

scapula

rhomboids : insertion

scapula

serratus anterior : insertion

scapula

trapezius : insertion

scapula + superior surface of clavicle

rhomboids : actions

stabilizes shoulder girdle

pectoralis major : origin

sternal head + clavicular head

sternocleidomastoid : insertion

sternal head and clavicle

levatores costarum, longus portion : origin

transverse process of T7-T11

levatores costarum, brevis portion : insertion

tubercle of rib below

subclavius : insertion

1st rib

scalenus (anterior, middle, and posterior) : origin

C2-C6 vertebrae

External Intercostal Muscles : Action

elevates rib cage

Internal Intercostal Muscles (chondral portion) : Action

elevates ribs

levatores costarum, brevis and longus portions : action

elevates ribs

scalenus (anterior, middle, and posterior) : action

elevates ribs 1-2

serratus anterior : action

elevates ribs 1-9

serratus posterior superior : action

elevates ribs 2-5

pectoralis minor : action

elevates ribs 2-5 with shoulder fixed

levator scapulae : action

elevates scapula

pectoralis major : action

elevates sternum + rib cage

sternocleidomastoid : action

elevates sternum + rib cage

* trapezius : action

elongates neck, stabilizes head

trapezius : origin

spinous process C2-T12

rhomboidus minor : origin

spinous process of C7-T11

serratus posterior superior : origin

spinous process of C7-T3

rhomboidus major : origin

spinous process of T2-T5

Internal Intercostal Muscles (chondral portion) : Insertion

superior surface of the rib below

levator scapulae : origin

transverse process C1-C4


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