muscles of the pectoral region

Question 1

name the 4 muscles of the pectoral region

Answer 1

• pectoralis major
  pectoralis minor
  serratus anterior
  and subclavius

Question 2

state the origin and insertion of the sternocostal head of the pectoralis major and nerve of innervation

Answer 2

origin : anterior sternum
Insertion ; intertubercular sulcus of the humerus
innervated by medial and lateral pectoral nerves

Question 3

state origin and insertion of the clavicular head of the pectoralis major and nerve innervation

Answer 3

originates from the anterior surface of the medial clavicle.
inserts into the intertubercular sulcus
innervated by the medial and lateral pectoral nerves

Question 4

what are the actions of the pectoralis major

Answer 4

adduction and medial rotation mainly

clavicular head also acts individually to flex upper limb

Question 5

location of the pectoralis minor, origin and insertion point an innervations

Answer 5

originates from the 3rd - 5th ribs
inserts into the coracoid process of the scapula
innervated by the medial pectoral nerve

Question 6

actions of the pectoralis minor

Answer 6

stabilises the scapula by drawing it anteroinferiorly against the thoracic wall

Question 7

serratus anterior , origin ,insertion, innervation , actions

Answer 7

serratus anterior located laterally on the chest wall
forms medial border of the axilla
originates from ribs 1 -8
main action is rotation of the scapula allows for abduction past 90 degrees
innervated by long thoracic nerve

Question 8

injury to which nerve can cause winging of the scapula

Answer 8

long thoracic nerve