Superficial Back Muscles

Question 1

Trapezius

Origin

Answer 1

• External occipital protuberance
• superior nuchal line
• ligamentum nuchae
• spinous processes of C7-T12

Question 2

Trapezius

insertion

Answer 2

• acromion
• spine of scapula
• lat 1\3 of clavicle

Question 3

Trapezius

innvervation

Answer 3

• accessory nn CN XI (motor)

- Cervical nn. (C3 and C4); (proprioception

Question 4

Trapezius

blood

Answer 4

-branches of transverse cervical a.

Question 5

Trapezius

action

Answer 5

• elevates
• retracts
• rotates scapula

Question 6

Latissimus Dorsi

origin

Answer 6

• thoracolumbar aponuerosis
• spinous process T6-T12
• iliac crest
• ribs X-XII

Question 7

Latissimus Dorsi

insertion

Answer 7

-floor of intertubercular groove of humerus

Question 8

Latissimus Dorsi

innervation

Answer 8

-thoracodorsal nn (C6, C7, C8)

Question 9

Latissimus Dorsi

Blood

Answer 9

-thoracodorsal aa. (branch of subscapular aa.)

Question 10

Latissimus Dorsi

action

Answer 10

• Extends
• adducts
• medially rotates humerus
• holds body when climbing

Question 11

Levator Scapulae

origin

Answer 11

-posterior tubercles of the transverse processes of C1-C4

Question 12

Levator Scapulae

Insertion

Answer 12

upper portion of medial border of scapula

Question 13

Levator scapulae

innvervation

Answer 13

• Dorsal scapular n. (C5)

- Cervical nn C3 and C4

Question 14

Levator scapulae

blood

Answer 14

dorsal scapular a.

Question 15

Levator scapulae

action

Answer 15

• elevates scapula

- tilts glenoid cavity inferiorly by rotating scapula

Question 16

Rhomboideus Major and Minor

origin

Answer 16

Major: Spinous processes T2-T5
Minor: Spinous processes C7-T1

Question 17

Rhomoideus Major and Minor

insertion

Answer 17

Medial border of scapula from above scapular spine to inferior angle.
-minor is cranial to major

Question 18

Rhomboideus Major and Minor

Innvervation

Answer 18

Dorsal scapular nn.

Question 19

Rhomboideus Major and Minor

Blood

Answer 19

Dorsal scapular a.

Question 20

Rhomboideus Major and Minor

action

Answer 20

Retracts scapula and elevates it (trapezius has same functions)

Question 21

Intermediate muscles of the back

Answer 21

• posterior serratus sup.

- post. serratus inf

Question 22

Function of intermediate muscles of back?

Answer 22

minor muscles of respiration

Question 23

Deep (True/Intrinsic) muscles of the back?

Answer 23

Erector spinae group of muscles:

• spinalis
• longissimus
• illiocostalis

Question 24

What fascia encloses the erector spinae muscle group?

Answer 24

• thorcolumbar fascia (has anterior and posterior laminae)

Question 25

Erector spinae muscle group

origin

Answer 25

• sacrum

- spinous processes of lower thoracic and lumbar vertebrae.

Question 26

Iliocostalis

insertion

Answer 26

angles of ribs

Question 27

Longissimus

insertion

Answer 27

transverse processes of vertebrae

Question 28

Spinalis

insertion

Answer 28

interconnect spinous processes of adjacent vertebrae

Question 29

Innvervation of erector spinae muscles

Answer 29

Dorsal primary rami
(erector spinae group are the only back muscles innervated my dorsal primary rami, the rest innervated by ventral primary rami).

Question 30

Number of bones in vertebral column

Answer 30

33

Question 31

Number of vertebrae in cervical region of vertebral column?

Answer 31

7

Question 32

Number of vertebrae in thoracic region?

Answer 32

12

Question 33

Number of vertebrae in lumbar region?

Answer 33

5

Question 34

Number of vertebrae in sacral region?

Answer 34

5

Question 35

Number of vertebrae in coccygeal region?

Answer 35

4

Question 36

Convex curvature of spine (forward)?

Answer 36

Cervical and Lumbar (secondary)

Question 37

Concave curvature of spine (forward)?

Answer 37

thoracic and sacral (primary)

Question 38

What are the 2 primary curvatures present at birth?

Answer 38

Thoracic and Sacral (concave forward)

Question 39

What are the 2 secondary curvatures that develop later?

Answer 39

Cervical and Lumbar (convex forward)