Pectoral Girdle Flashcards
What muscles are responsible for elevation of scapula?
- upper + middle trapezius
- rhomboids (major & minor)
- levator scapulae
What muscles are responsible for depression of scapula?
- pectoralis minor
- lower trapezius
What muscles are responsible for protraction of scapula?
- pectoralis minor
- serratus anterior
What muscles are responsible for retraction of scapula?
- rhomboids
- upper and lower trapezius
What muscles are responsible for lateral (upwards) rotation of scapula?
- all three fibres of the trapezius (whole traps)
- serratus anterior
What muscles are responsible for medial (downwards) rotation of scapula?
- pec minor
- levator scap
- rhomboids
(origin, insertion) of upper trap (descending tract)
o: external protuberance of occipital bone, nuchal ligament -> spinous process of C7
i: posterior lateral one-third of scapula
middle trapezius (transverse tract)
o: spinous processes of C7 -> T4
i: acromion of scapula and lateral half of spine of scapula
lower trapezius (ascending tract)
o: spinous processes of T4 -> T12
i: triangular base of scapular spine
rhomboid minor
o: spinous processes of C7 -> T1, nuchal ligament
i: medial border of scapula
rhomboid major
o: spinous process of T2 -> T5
i: medial border of scapula
pectoralis minor
i: anterior ends of 3rd to 5th ribs
o: coracoid process
serratus anterior
o: 1st to 9th rib
i: anterior aspect of medial border of scapula
levator scapulae
o: transverse process of C1 -> c4
i: superior angle of scapula
What is the action of the subclavius muscle?
- stabilizes the clavicle in its motion
