Week 5 - Anterior axioappendicular muscles

Question 1

Anterior axio-appendicular muscles (4)

Answer 1

A. Pectoralis major
B. Pectoralis minor
C. Subclavius
D. Serratus anterior

Question 2

Pectoralis Major Att., Action, NS

Answer 2

Attachments:
Proximal:
Clavicular head: medial clavicle
Sternal head: sternum and superior 6
costal cartilages
Distal: lateral lip intertubercular sulcus
humerus

Action: Adduction & IR humerus
Clavicular: flexes humerus
Sternal: extends humerus from flexed
position

NS: lateral & medial pectoral n.

Question 3

Pectoralis Minor Att., Action, NS

Answer 3

Attachments:
P: anterior surface of 3rd-5th ribs near
costal cartilages
D: coracoid process

Action: draws scapula anteriorly and
inferiorly against thorax (scapula IR);
scapula anterior tilt, stabilise scapula

NS: medial pectoral n.

Question 4

Subclavius Att., Function, NS

Answer 4

Between clavicle and 1st rib
Attachments:
P: costal cartilaginous joint 1st rib
D: clavicle

Function: pulls clavicle into SCJ

NS: nerve to subclavius

Question 5

Serratus anterior Att., Action, NS

Answer 5

Attachments:
P: ribs 1-8 (Ser8us)
D: medial border of scapula

Action: protract and upwardly rotate
scapula; stabilise scapula against
thoracic wall

NS: Long thoracic n.