Anatomy of Posterior Shoulder & Rotator Cuff

Question 1

what are the different muscles that attach to the scapula and humerus

Answer 1

deltoid, trapezius, levator scapulae, rhomboids, rotator cuff muscles, teres major

Question 2

what joint movement are the muscles attached to the scapula and humerus involved in

Answer 2

shoulder joint movement

Question 3

what are the Rhomboid muscles of the shoulder

Answer 3

rhomboid major and rhomboid minor

Question 4

what are the different rotator cuff muscles

Answer 4

supraspinatus, infraspinatus, subscapularis, teres minor

SITS

Question 5

what different parts is the deltoid muscles split into

Answer 5

posterior(spinal), middle(acromial), anterior(clavicular)

Question 6

what movement is the posterior (spinal) part of the deltoid muscle used for

Answer 6

extension at shoulder

Question 7

what movement is the middle(acromial) part of the deltoid muscle used for

Answer 7

abduction at shoulder(takes over from supraspinatus at 15 degrees)

Question 8

what movement is the anterior(clavicular) part of the deltoid muscle used for

Answer 8

mainly flexion at shoulder

Question 9

what movements are the different parts(3) of the trapezius muscle used for

Answer 9

ascending = scapular depression
middle = scapular retraction
descending = scapular depression

Question 10

what movement does contraction of both the ascending and descending parts of the trapezius produce

Answer 10

superior rotation of glenoid fossa

Question 11

what movement is levator scapulae used for

Answer 11

elevation of scapula and inferior rotation of glenoid fossa

Question 12

what movement are both the rhomboid major and minor used for

Answer 12

retraction of scapula and inferior rotation of glenoid fossa

Question 13

what function do all the rotator muscles share

Answer 13

stabilise head of humerus in glenoid

Question 14

what rotator muscles are involved in lateral rotation of the shoulder

Answer 14

infraspinatus and teres minor

Question 15

what rotator cuff muscle is used for medial rotation of the shoulder

Answer 15

subscapularis

Question 16

what rotator cuff muscle is used for abduction at the shoulder

Answer 16

supraspinatus, only for the first 15 degrees

Question 17

which rotator muscles distally insert in the greater tubercle of the humerus

Answer 17

supraspinatus, infraspinatus, teres minor

Question 18

which rotator muscle distally inserts in the lesser tubercle of the humerus

Answer 18

subscapularis

Question 19

where does the innervation of the rotator cuff muscles come from

Answer 19

the brachial plexus

Question 20

what are the borders of the quadrangular space

Answer 20

teres minor, teres major, long head of triceps, humerus