Dissection 11

Question 1

What are the 3 parts of the deltoid muscle?

Answer 1

posterio (spinal); middle (acromial) and anterior (clavicular)

Question 2

What is the function of the spinal part of the deltoid?

Answer 2

extension at the shoudler

Question 3

What is the function of the acromial part of deltoid?

Answer 3

abduction at shoulder- taking over from supraspinatous beyond 15 degrees)

Question 4

What is the function of the clavicular part of deltoid?

Answer 4

mainly flexion at shoulder

Question 5

What does the ascedning part of trapezius do?

Answer 5

scapular depression

Question 6

what is the function of the middle part of trapezius?

Answer 6

retraction

Question 7

What is the function of the descending part of trapezius?

Answer 7

elevation

Question 8

What do the ascending and descending parts of trapezius work together to do?

Answer 8

superior rotation of glenoid fossa

Question 9

What is the function of levator scapulae?

Answer 9

elevation of scapula and inferior rotation of glenoid fossa

Question 10

What do rhomboid major and minor do?

Answer 10

retraction of scapula and inferior rotation of glenoid fossa

Question 11

What are the rotator cuff muscles?

Answer 11

SITS-
Supraspinatus
Infrapsinatus
Teres minor
Subscapularis

Question 12

What is the function of supraspinatus?

Answer 12

first 15 degrees of abduction at hsoulder

Question 13

What is the function of infraspinatus and teres minor?

Answer 13

stabilise head of humerus in glenoid/lateral rotation at shoulder

Question 14

What is the function of subscapularis?

Answer 14

stabilise head of humerus in glenoid/medial rotation at shoulder

Question 15

What is the function of teres major?

Answer 15

adduction/medial rotation at shoulder

Question 16

What does the deltoid muscle do when all parts of the muscle work together?

Answer 16

abduction of the shoulder joint

Question 17

What is needed for the full abduction and adduction of the arm?

Answer 17

the scapula most rotate so that the glenoid fossa moves- superiorly for abduction and ineriorly for adduction

Question 18

Why are the SITS muscles named the rotator cuff?

Answer 18

the distal tendons blend and reinforce the fibrous capsule of the shoulder joint

Question 19

What is the pupose of the rotator cuff?

Answer 19

stabilises the shallow ball and socket joitn

Question 20

What is the distal insertion of supraspinatus, infraspinatus and teres minor?

Answer 20

greater tubercle of the humerus

Question 21

What is the distal attachment of the subscapularis?

Answer 21

lesser tubercle of the humerus

Question 22

What is foudn in the deep aspect of trapezius muscle?

Answer 22

spinal accessory nerve

Question 23

What are the muscles deep to trapezius from superior to infeior?

Answer 23

levator scapulae; rhomboid minor ; rhomboid major

Question 24

What do the muscles deep to trapezius attach to?

Answer 24

medial border of the scapula and the spinous process of cervical and upper thoracic vertebrae

Question 25

What nerve supplies the deltoid musce?

Answer 25

axiallry

Question 26

What is the proximal attachment for subscapularis?

Answer 26

subscapular fossa

Question 27

What is the proximal attachment for infraspinatous?

Answer 27

infraspinatous foss

Question 28

What is the prox. attahcment for supraspinatous fossa?

Answer 28

supraspinatous fossa

Question 29

What is the proximal attachment for teres minor?

Answer 29

middle part of lateral border of shoulder

Question 30

What causes painful arc syndrome?

Answer 30

impingement of supraspinarous endon between the humerus and acromion process which will cause pain during abduction