Thoracic wall and lungs musculature

Question 1

Pectoralis major attachment points

Answer 1

Prox: medial 1/2 clavicle, sternum, costal heads of ribs 6+7
DIstal: lateral lip of intertubercular crest / bicipital groove of humerus

Question 2

Pec major innervation/ blood supply

Answer 2

Lateral pectoral nerve (C5-T1), medial pectoral nerve (C8,T1)

Pectoral branch of thoracoacromial trunk

Question 3

Pec major actions

Answer 3

GH joint flx/ext and IR/ADD

Question 4

Pectoralis minor attachments

Answer 4

Prox: ribs 3-5
Distal: Coracoid process of the scapula

Question 5

Pec minor innervation/BS

Answer 5

Medial pectoral nerve (C8,T1); pectoral branch of thoracoacromial trunk

Question 6

Actions of pec minor

Answer 6

depression and anterior tilt of scapula

Question 7

Subclavius attachments

Answer 7

Prox: costal cartilage of rib 1
Distal: under distal surface of clavicle

Question 8

Innervation/BS of subclavius and actions

Answer 8

Nerve to subclavius (C5-C6); pectoral branch of thoracoacromial trunk

Depression of clavicle

Question 9

Serratus anterior attachments

Answer 9

Prox: ribs 1-9
Distal: anterior medial border of the scapula

Question 10

Innervation/BS of serratus anterior

Answer 10

SALT57; Long thoracic nerve (C5-C7) ; lateral thoracic and thoracodorsal arteries

Question 11

Actions of serratus anterior

Answer 11

Scapular protraction; holds scap to thorax; upward rotation of scap; elevation of rib

Question 12

Diaphragm attachments

Answer 12

Prox: costal margin, inferior border of ribs 11/12, L3 right crus and L2 left crus
Distal: central tendon

Question 13

Innervation/BS of the diaphragm

Answer 13

Phrenic nerve (C3-C5); musculophrenic and inferior phrenic arteries

Question 14

Action of diaphragm

Answer 14

Normal breathing at rest; over 70-80% of inspiration at rest