1
Q
Origin or trap
A
External occipital protuberance Medial part of the superior nuchal line Nuchal ligament (eop-c7) Spinous process (c7-t12) Supraspinous ligaments (c7-t12)
2
Q
Insertion of trap
A
Upper 3rd: posterior inner surface of the lateral aspect of the clavicle
Middle 3rd: acromion process
Lower 3rd: spine of scapula
3
Q
Upper 3rd trap
A
EOP-C4
4
Q
Middle 3rd trap
A
C5-T4
5
Q
Lower 3rd of trap
A
T5-T12
6
Q
Innervation of trap
A
Accessory nerve (cranial nerve XI)
7
Q
Blood supply for trap
A
Transverse cervical artery from the subclavian artery
Transverse cervical vein carries it away
8
Q
Action upper 3rd
A
Shoulder elevation, clavicular elevation
9
Q
Action for middle third
A
Shoulder elevation
Upward scapular rotation
Scapular retraction
10
Q
Action lower 3rd
A
Shoulder and scapular depression
Upward scapular rotation
