muscles of rib cage wall

Question 1

Pulls sternum, clavicle, and ribs UPWARDS
Origin: top of sternum and sternal end of clavicle

Answer 1

Sternocleidomastoid

I: skull (mastoid process

Question 2

Scalenus Anterior and Scalenus Medius

Answer 2

Function: lifts first rib

Origin of Anterior: 3-6th cervical vertebrae
Origin of Medius: lower 6 cervical vertebrae

I: first rib

Question 3

Scalenus Posterior

Answer 3

Function: lifts second rib
O: lower 2 or 3 cervical vertebrae
I: outer surface of 2nd rib

Question 4

Function: pulls sternum and ribs upward
Origin: upper costal cartilages, sternum, inner half of clavicle

Answer 4

Pectoralis Major

I: humerus

Question 5

O: 2-5th ribs near cartilage
I: scapula

Answer 5

pectoralis minor

Function: elevates 2nd -5th ribs

Question 6

O: clavicle
I: first rib

Answer 6

Subclavius
Function: lifts first rib

Question 7

Function: elevates upper ribs
Origin: upper 8 or 9 ribs

Answer 7

Serratus Anterior
I: scapula

Question 8

External Intercostals

Answer 8

Function: elevates rib directly below it. can move indivs or groups, stiffens spaces between ribs

Question 9

Internal Intercostals

Answer 9

InterOSSeous portion: depress ribs and stiffen spaces in between

interCARTilageneus portion: elevates ribs

Question 10

O: lower sternum and 4th or 5th-7th costal cartilages
I: inner surface of costal cartilages and bony ends of 2-6th ribs

Answer 10

Transversus Thoracis

Function: depresses ribs 2-6

Question 11

Latissimus Dorsi
I: humerus

Answer 11

F: compresses lower portion of rib cage OR elevates lower ribs if humerus is fixed– does BOTH

O: 6 thoracic, lumbar, and sacral vertebrae, and lower 3-4 ribs

Question 12

Function: elevates 2nd through 5th ribs
Origin: last cervical vertebrae and first 3-4 thoracic vertebrae​

Answer 12

Serratus Posterior Superior

Insertion: 2-5th ribs

Question 13

Function: depresses lower 4 ribs

Origin: lower 2 thoracic and upper 2-3 lumbar vertebrae

Answer 13

Serratus Posterior Inferior

I: lower 4 ribs

Question 14

Lateral Iliocostalis Cervicis

Answer 14

F: elevates 3-6 ribs

O: 3-6th ribs

I: 4-6 cervical vertebrae

Question 15

Lateral Iliocostalis thoracis

Answer 15

F: stabilizes and goes with whoever is working

O: lower 6 ribs

I: Upper 6 ribs

Question 16

Lateral Iliocostalis lumborum

Answer 16

F: depresses lower 6 ribs

O: lumbodorsal fascia, lumbar vertebrae, hip bone

I: lower 6 ribs

Question 17

Levatores Costarum

I: rib immediately below the vertebra of origin

Answer 17

F: lifts individual rib into its insertion, collectively elevates rib cage as a unit

O: 7th cervical and upper 11 thoracic vertebrae

Question 18

F: pulls downward on lowest rib

O: hip bone

Answer 18

Quadratus Lumborum

I: first 4 lumbar vertebra and lowest rib

Question 19

O: near vertebral column on inner surface of ribs

I: inner surface of ribs directly 1 or 2 above it

Answer 19

Subcostal Muscles

F: pull downward on attached ribs

number and location varies