Superficial Back Muscles O/I/A

Question 1

Trapezius (Medial attachment) Origin (5 points)

Answer 1

Origin:

• Medial 1/3 of sup. nuchal line
• external occipital protruberance
• ligamentum nuchae
• spinous proc. of C7
• all thoracic vertebrae

Question 2

Trapezius (Lateral Attachment) Insertion (3 points)

Answer 2

Insertion

• Lat. 1/3 of clavicle
• Acrominon Proc
• Spine of scapula

Question 3

Trapezius Actions

Answer 3

Stabilizes, raises, retracts and rotates the scapula

• Sup. fibers elevate
• Mid. fibers retract
• Inf. fibers depress
• Sup + inf. fibers = Rotation

Question 4

Trapezius Innervation

Answer 4

1. Accessory (XI)
2. Ventral Rami of C3/C4

Question 5

Levator Scapulae Origin (medial attachment)

Answer 5

Trans. proc of C1-C4

Question 6

Levator Scapulae Insertion

Answer 6

Vertebral border of the scapula b/t superior angle and the spine

Question 7

Levator Scapulae Actions (5)

Answer 7

1. Raises the scapula
   
   1. And draws it medially
2. W/ scapula fixed:
   
   1. Bend neck laterally
   2. Rotates it to the same side
3. Extends the neck

Question 8

Levator Scapulae Innervation

Answer 8

1. C3-C4 spinal nerves
2. Dorsal scapular nerve (C3-C5)

Question 9

Rhomboid Major Origin (medial atachment)

Answer 9

Spinous proc. of T2-T5

Question 10

Rhomboid Major Insertion (lat. attachment)

Answer 10

Medial border of scapula b/t spine and inf. angle

Question 11

Rhomboid Major Actions (4)

Answer 11

1. Adducts scapula
2. Retracts scapula
3. Elevates scapula
4. Rotates scapula

*Does so that the glenoid cavity faces downward & stabilizes the scapula*

Question 12

Rhomboid Major Innervation

Answer 12

Dorsal Scapular nerve (C5)

Question 13

Rhomboid Minor Origin

Answer 13

Spinous proc. of C7-T1

Question 14

Rhomboid Minor Insertion

Answer 14

Medial border of the scapula at the root of the spine (superior part of scapula, sup. to rhomboid maj.)

Question 15

Rhomboid Minor Actions

Answer 15

Retracts/Stabilizes the scapula

Elevates verterbral border

Rotates scapula to depress the inf. angle

Question 16

Rhomboid Minor Innervation

Answer 16

Dorsal Scapular Nerve (C5)

Question 17

Lat. Dorsi Origins

Answer 17

1. Indirect attachment through lumbodorsal fascia into spinous proc. of T7-L5
2. Lower 3-4 ribs
3. Illiac crest

Question 18

Lat Dorsi Insertion

Answer 18

In floor of intertubercular groove of humerus

Question 19

Lat Dorsi Actions (3)

Answer 19

1. Adduct
2. Extend
3. Medially rotate arm

**Like being handcuffed**

Question 20

Lat. Dorsi Innervation

Answer 20

Thoracordorsal nerve (C6-C8)