Anatomy: Back and Scapular Region

Question 0

Teres Minor

Answer 0

N: axillary
A: laterally rotates arm, acts with rotator cuff muscles
O: lateral border of scapula
I: greater tubercle of humerus

Question 1

Teres Major

Answer 1

N: lower subscapular
A: adducts and medially rotates arm
O: inferior angle of scapula
I: intertubercular groove

Question 2

Supraspinatus

Answer 2

N: suprascapular
A: initiates abduction of arm first 15*, acts with rotator cuff muscles
O: supraspinous fossa of scapula
I: greater tubercle of humerus

Question 3

Rhomboid Minor

Answer 3

N: dorsal scapular
A: retract scapula, rotate scapula to depress glenoid cavity
O: nuchal ligament and spinous process of C7-T1

Question 4

Levator Scapulae

Answer 4

N: dorsal scapular
A: elevate scapula, tilt glenoid cavity inferiority, incline neck to the same side
O: transverse processes C1-C4
I: medial border of scapula superior to root of scapular spine

Question 5

Rhomboid Major

Answer 5

N: dorsal scapular
A: retract scapula, rotate scapula to depress glenoid cavity
O: spinous process of T2-T5
I: medial border of scapula

Question 6

Deltoid

Answer 6

N: axillary
A: anterior - flex and medially rotate arm, middle - abduct arm, posterior - extend and laterally rotate arm
O: clavicle, acromion and spine do the scapula
I: deltoid tuberosity of humerus

Question 7

Triceps Brachii

Answer 7

N: radial
A: extend forearm and arm, long head resists dislocation of humerus during adduction
O: long head - infraglenoid tubercle of scapula, lateral head - posterior surface of humerus superior to radial groove, medial head - posterior surface of humerus inferior to radial groove
I: olecranon of ulna and fascia of forearm

Question 8

Trapezius

Answer 8

N: spinal accessory CN 11, C3 and anterior rami
A: descending - elevates, ascending - depresses, middle - retracts scapula, all rotate glenoid superiorly
O: superior nuchal line, external occipital protuberance, nuchal ligament, spinous process C7-T12
I: lateral third of clavicle, acromion, and spine of scapula

Question 9

Latissimus Dorsi

Answer 9

N: thoracodorsal
A: extend, addict, medially rotate, raises body toward arms during climbing
O: spinous process of T7-T12, thoracolumbar fascia, iliac crest, 9-12 ribs
I: inter tubercular groove of humerus

Question 10

Serratus Anterior

Answer 10

N: long thoracic
A: protract and rotate scapula
O: ribs 1-8
I: anterior surface of medial scapula

Question 11

Infraspinatus

Answer 11

N: super scapular
A: laterally rotates arm; acts with rotator cuff
O: infraspinous fossa of scapula
I: greater tubercle of humerus