MUSCLES OF THE SHOULDER GIRDLE

Question 1

TRAPEZIUS (entire mm): O, I

Answer 1

O: EOP, medial 1/3 of sup. nuchal line of occiput, nuchal lig, and SP of C7 - T12

I: lateral 1/3 of clavicle, acromion process and spine of scapula

Question 2

UPPER TRAP: O,I

Answer 2

O: EOP, medial 1/3 of sup nuchal line of occiput, nuchal lig, SP C7

I: lateral 1/3 of clavicle and acromion process of scapula

Question 3

UPPER TRAP: A, N

Answer 3

A: elevates, retracts, UPwardly rotates the scapula at the scapulocostal joints
(RMA: extends, contralaterally rotates and laterally flexes the neck at the spinal joints)

N: dorsal scapular n. C4-C5

Question 4

MIDDLE TRAP: O, I

Answer 4

O: SP T1 - T5

I: acromion process and spine of scapula

Question 5

MIDDLE TRAP: A,N

Answer 5

A: retracts scapula at scapulocostal joint
(RMA: contralaterally rotates trunk at spinal joints)

N: dorsal scapular n. C4-C5

Question 6

LOWER TRAP: O,I

Answer 6

O: SP T6-T12

I: tubercle at the root of the spine of the scapula

Question 7

LOWER TRAP: A,N

Answer 7

A: depresses, retracts, and UPwardly rotates scapula at scapulocostal joint
(RMA: extend, contralaterally rotates and laterally flexes trunk at spinal joints)

N: dorsal scapular n. C4-C5

Question 8

RHOMBOIDS (major and minor): O,I

Answer 8

O: SP C7-T1 and inferior nuchal ligament (minor); SP T2-T5 (major)

I: root of spine of scapula (minor); between root of spine of scapula and inferior angle of scapula (major)

Question 9

RHOMBOIDS (major and minor): A,N

Answer 9

A: retracts, elevates and downwardly rotates the scapula at the scapulocostal joints

N: dorsal scapular n. C4-C5

Question 10

LEVATOR SCAPULA: O,I

Answer 10

O: TP’s of C1-C4

I: medial border of the scapula - from superior angle to root of spine

Question 11

LEVATOR SCAPULA: A,N

Answer 11

A: elevates scapula at scapulocostal joints; RMA: extends and laterally flexes the neck at the spinal joints

N: dorsal scapular n C3-C5

Question 12

SERRATUS ANTERIOR: O,I

Answer 12

O: anterolaterally on ribs 1-9

I: anterior surface of the medial border of the scapula

Question 13

SERRATUS ANTERIOR: A,N

Answer 13

A: protracts and UPwardly rotates the scapula at the scapulocostal joints

N: long thoracic n. (C5-7)

Question 14

PECTORALIS MINOR: O,I

Answer 14

O: ribs 3-5

I: coracoid process

Question 15

PECTORALIS MINOR: A,N

Answer 15

A: protracts, depresses and DOWNWARDLY rotates the scapula at the scapulocostal joint
(RMA: elevates ribs 3-5 at the SC and costospinal joints)

N: medial and lateral pectoral n.

Question 16

SUBCLAVIUS: O,I

Answer 16

O: rib 1 at the junction with its costal cartilage

I: middle 1/3 of inferior surface of clavicle

Question 17

SUBCLAVIUS: A,N

Answer 17

A: depresses clavicle at the SC joint
(RMA: elevates rib 1 at SC and costospinal joints)

N: a nerve from brachial plexus (C5,C6)