Superficial Back Muscles Flashcards
(23 cards)
Trapezius actions.
1) upper elevate scapula
2) middle retract scapula
3) lower pull medial boarder of scapula, orientating the glenoid fossa upward.
Trapezius innervated by?
- accessory nerve for motor
- branches of the ventral primary rami of C3 and C4 for sensation
Latissimus dorsi innervation.
Thoracodorsal nerve
Latissimus dorsi actions.
1) extends arm at glenohumeral joint
2) adducts the arm at the glenohumeral joint
3) medially rotates the arm at the glenohumeral joint
Superficial layer of the back?
Trapezius and latissimus dorsi
Deep layer of back includes?
Levator scapulae, rhomboid minor, and rhomboid major.
Levator scapulae innervated by?
1) dorsal scapular nerve
2) ventral primary rami
Levator scapulae actions?
1) pull scapula medially
2) pull scapula upward
Rhomboid minor innervated by?
Dorsal scapular nerve
Rhomboid minor actions?
1) pull scapula medially
2) pull scapula upward
Rhomboid major innervated by?
Dorsal scapular nerve
Rhomboid major actions?
1) pull scapula medially
2) pull scapula upward
Superficial layer of shoulder?
Deltoid
Deep layer of shoulder?
- supraspinatus
- infraspinatus
- subscapularis
- teres minor and major
Supraspinatus innervated by?
Suprascapular nerve C5-C6
Infraspinatus innervation?
Suprascapular nerve C5-C6
Supraspinatus actions?
1) initiates the first 60 degrees of abduction of the arm
2 stabilizes the shoulder joint
Infraspinatus actions?
1) laterally rotates the arm
2) stabilizes the shoulder joint
Subscapularis innervated by?
1) lower subscapular nerves C5-C6
2) upper subscapular nerves C5
Teres minor innervated by ?
Axillary nerve (C5-C6)
Teres minor actions?
Lateral rotator
Teres major innervation?
Lower subscapular nerve (C5-C6)
Teres major actions?
1) medial rotator
2) adduction
