Trapezius Flashcards
1
Q
trapezius
Origins
A
- EOP
- medial 1/3 of superior nuchal line
- ligamentum nuchae
- SPs C7-T12
2
Q
trapezius
Insertion
A
- superior: lateral 1/3 of clavicle
- middle: spine & acromion of scapula
- inferior: base of spine of scapula
3
Q
trapezius
Innervation
A
- CN XI accessory
- ventral rami of 3rd & 4th cervical nerves
- CN XI + C3/4 fibers = subtrapezial plexus on deep surface of muscle
4
Q
trapezius
CN XI function
A
Motor
5
Q
trapezius
C3 & C4 ventral rami fibers function
A
Proprioception
6
Q
trapezius
Blood supply
A
Superficial branch of transverse cervical artery
7
Q
trapezius
Actions
A
- raise, retract, rotate scapula
- bilateral contraction of superior fibers: extend head
- unilateral contraction of upper fibers: laterally flexes head & cervical vertebrae
8
Q
trapezius
Actions of superior fibers
A
- Elevate scapula
- with Serratus anterior & levator scapulae form force couple to rotate the scapula (upwards)
9
Q
trapezius
Action of middle fibers
A
Retract the scapula
10
Q
trapezius
Actions of inferior fibers
A
Depress scapula, lower shoulders
