Muscles Of The Shoulder OINA

Question 1

Trapezius Origin

Answer 1

Superior nuchal line
External occipital protuberance
Medial margin of the ligamentum nuchae
Spinous processes of of C7 to T12 & the related supraspinous ligaments

Question 2

Trapezius Insertion

Answer 2

Superior edge of the crest of the spine of the scapula
Acromion
Posterior border of the lateral 1/3 of clavicle

Question 3

Trapezius Innervation

Answer 3

Motor spinal part of accessory neuron (XI)
Sensory (proprioception) anterior rami of C3 & C4

Question 4

Trapezius Action

Answer 4

Powerful elevator of scapula
Rotates the scapula during abduction of the humerus above horizontal
Middle fibers retracts scapula
Lower fibers depress scapula

Question 5

Deltoid Origin

Answer 5

Inferior edge of the crest of the spine of the scapula
Lateral margin of the acromion
Anterior border of the lateral 1/3 of clavicle

Question 6

Deltoid Insertion

Answer 6

Deltoid tuberosity of the humerus

Question 7

Deltoid Innervation

Answer 7

Axillary nerve (C5, C6)

Question 8

Deltoid Action

Answer 8

Major abductor of arm
Clavicular fibers assist in flexing the arm
Posterior fibers assist in extending the arm

Question 9

Levator Scapulae Origin

Answer 9

Transverse processes of C1 & C2 vertebrae
Posterior tubercles of transverse processes of C3 & C4 vertebrae

Question 10

Levator Scapulae Insertion

Answer 10

Posterior surface of medial border of scapula from the superior angle to the root of the spine of the scapula

Question 11

Levator Scapulae Innervation

Answer 11

Branches directly from the anterior rami of C3 & C4 spinal nerves & by branches (C5) from the dorsal scapular nerve

Question 12

Levator Scapulae Action

Answer 12

Elevates the scapula

Question 13

Rhomboid Minor Origin

Answer 13

Lower end of ligamentum nuchae & spinous processes of C7 & T1 vertebrae

Question 14

Rhomboid Minor Insertion

Answer 14

Posterior surface of the medial border of the scapula at the root of the spine of the scapula

Question 15

Rhomboid Minor Innervation

Answer 15

Dorsal scapular nerve (C4 & C5)

Question 16

Rhomboid Minor Action

Answer 16

Elevates & retracts the scapula

Question 17

Rhomboid Major Origin

Answer 17

Spinous processes of T2- T5 vertebrae &
Intervening supraspinous ligaments

Question 18

Rhomboid Major Insertion

Answer 18

Posterior surface of the medial border of the scapula from the root of the spine of the scapula to the inferior angle of the scapula

Question 19

Rhomboid Major Innervation

Answer 19

Dorsal scapular nerve (C4- C5)

Question 20

Rhomboid Major Action

Answer 20

Elevates & retracts the scapula