Trunk Muscles: Origin, insertion, Innervatio, functon (OIIF)

Question 1

what is OIIF of pectoralis major

Answer 1

O: Clavicular head: anterior
surface of clavicle
(medial half)
Sternocostal head:
Anterior surface of
sternum, Costal
cartilages of ribs 1-6
Abdominal (Rectus) head:
Anterior layer of rectus sheath

I: Crest of greater tubercle
of humerus (all heads)

Innervation:Lateral and medial
pectoral nerves (C5-T1)

F:Shoulder joint: Arm
adduction, Arm internal
rotation, Arm flexion
(clavicular head), arm
extension (sternocostal
head);
Scapulothoracic joint:
Draws scapula
anteroinferiorly