Muscles Of Shoulder

Question 1

Deltoid muscle

Answer 1

O-Lateral third of clavicle,acromion,spine of scapula
I-Deltoid tuberosity of humerus
N-Axillary Nerve
Action-ant fibers-flexion of shoulder joint
Post fibers-extension of shoulder joint
*Upper fibers-abduction of shoulder joints up to 90 degree

Question 2

Supraspinatus muscle

Answer 2

O-supraspinous fossa
I-Greater tuberosity
N-Suprascapular nerve
A-elevation of scapula , abduction of shoulder joint up to 15 degrees

Question 3

Infraspinatus muscle

Answer 3

O-Infraspinous fossa
I-Greater tuberosity
N-Suprascapular nerve
A-lateral rotation, extension and adduction of shoulder joint

Question 4

Subscapularis muscle

Answer 4

O-Subscapular fossa
I-Lesser tuberosity
N-Upper and Lower subscapular nerve
A-Medial rotation of shoulder joint

Question 5

Teres minor muscle

Answer 5

O-Posterior surface lateral border of scapula
I-Greater tuberosity
N-Axillary Nerve
A-Lateral rotation, weak adduction of shoulder joint

Question 6

Teres major muscles

Answer 6

O-Posterior surface lateral border of scapula
I-Medial lip of intertubercular groove of humerus
N-Thoracodorsal nerve
A-Extension and medial rotation of shoulder joint

Question 7

Abduction of shoulder joint up to 15 degrees by

Answer 7

Suprascapularis m/s

Question 8

Abduction of shoulder joint up to 90 degrees by

Answer 8

Deltoid m/s