Anatomy Back Muscles Week 1

Question 1

Origin of Trapezius Muscle

Answer 1

Posterior skull (Occipital), Posterior neck soft tissue, spinous processes of lower neck, and thoracic vertebrae

Question 2

Trapezius Insertion

Answer 2

Clavicle, acromion+spine of scapula

Question 3

Trapezius Innervation

Answer 3

Spinal accessory nerve (CN XI)

Question 4

Trapezius Function

Answer 4

Shoulder elevation/ depression
Retracts scapula
Rotates glenoid to face superiorly (Helps us reach up)

Question 5

Trapezius Notes

Answer 5

Different parts do different things, pay attention to fiber orientation

Question 6

Latissimus Dorsi Origin

Answer 6

Inferior ribs, thoracolumbar fasica, spinous processes of lower thorax

Question 7

Latissimus Dorsi Insertion

Answer 7

Intertubercular groove of humerus

Question 8

Latissimus Dorsi Innervation

Answer 8

Thoracodorsal nerve

Question 9

Latissimus Dorsi Function

Answer 9

Extends, adducts, and medially rotates arm at shoulder

Question 10

Rhomboid Major & Minor Origin

Answer 10

Spinous processes of lower neck, upper thorax

Question 11

Rhomboid Major & Minor Insertion

Answer 11

Medial border of scapula from spine to inferior angle

Question 12

Rhomboid Major & Minor Function

Answer 12

Retract scapula and rotate glenoid to face inferiorly

Question 13

Rhomboid Major & Minor Innervation

Answer 13

Dorsal scapular nerve

Question 14

Rhomboid Major and Minor Note

Answer 14

Rhomboid minor is slightly more superior than Major

Question 15

Levator scapulae Orgin

Answer 15

Posterior aspect of upper cervical transverse processes

Question 16

Levator Scapulae Insertion

Answer 16

Medial border of scapula superior to spine of scapula

Question 17

Levator Scapulae Function

Answer 17

Elevates scapula and rotate glenoid to face inferiorly

Question 18

Iliocostalis Origin

Answer 18

Posterior iliac crest and sacrum, sacral and lumbar spinous process

Question 19

Iliocostalis Insertion

Answer 19

Ribs and cervical transverse processes

Question 20

Iliocostalis innervation

Answer 20

Posterior rami of spinal nerves

Question 21

Iliocostalis Function

Answer 21

Uliateral: Laterally flex vertebral column to contracting side

Bilateral: Extend vertebral column and head

Question 22

Longissimus Orgin

Answer 22

Posterior iliac crest and sacrum, sacral, and lumbar spinous processes

Question 23

Longissimus Insertion

Answer 23

Ribs and inferior skull on posterior side (temporal bone)

Question 24

Longissimus Innervation

Answer 24

Posterior rami of spinal nerves

Question 25

Longissimus Function

Answer 25

Unilateral: laterally flex vertebral column to contracting side

Bilateral: Extend vertebral column and head

Question 26

Spinalis Origin

Answer 26

Posterior iliac crest and sacrum, sacral, lumbar, and spinous processes

Question 27

Spinalis Insertion

Answer 27

Spinous processes in the thorax and neck

Question 28

Spinalis Innervation

Answer 28

Posterior rami of spinal nerves

Question 29

Spinalis Function

Answer 29

Unilateral: Laterally flex vertebral column to contracting side

Bilateral: Extend vertebral column and head

Question 30

Levator Scapulae Innveration

Answer 30

Dorsal scapular nerve and ventral rami of cervical spinal nerves

Question 31

What is this muscle?

Answer 31

rhomboid minor

Question 32

What is this muscle?

Answer 32

Levator Scapulae

Question 33

What is this muscle

Answer 33

Rhomboid Major

Question 34

What is this muscle’s origin?

Answer 34

Posterior aspect of upper cervical transverse process

Question 35

What is this muscle’s insertion?

Answer 35

Medial border of scapula superior to the scapular spine

Question 36

What is this muscle’s function & innervation?

Answer 36

Elevates scapula & rotate glenoid to face inferiorly

Dorsal scapular nerve & ventral rami of cervical spine nerve

Question 37

What is this muscle’s origin?

Answer 37

Spinous process of lower neck, upper thorax

Question 38

What is this muscle’s insertion?

Answer 38

Medial border of scapula from spine to inferior angle

Question 39

What is this muscle’s function & innervation?

Answer 39

retract scapula & rotate glenoid to face inferiorly

Question 40

What is this muscle?
Name it’s origin & insertion

Answer 40

Spinalis.

O: posterior iliac crest & sacrum, sacral, lumbar, and spinous processess

I: spinous process in the thorax and neck

Question 41

What is this muscle’s innervation & function?

Answer 41

Innervation: posterior rami of spinal nerves
Function: Laterally flex vertebral column to contracting side; extend vertebral column and head

Question 42

What is this muscle? Name its origin & insertion

Answer 42

Iliocostalis
O: posterior illiac crest & sacrum, sacral, and lumbar spinous processes

I: ribs and cervical transverse processes

Question 43

What is this muscle’s function & innervation

Answer 43

Function: Laterally flex vertebral column to contracting side; extend vertebral column and head
Innervation: Posterior rami of spinal nerves

Question 44

What is this muscle? Name its origin & insertion?

Answer 44

Longissimus

O: Posteiror iliac crest and sacrum, sacral and lumbar spinous processes

I: ribs and inferior skull on temporal bone

Question 45

What is this muscle’s innervation & function?

Answer 45

Innervation: Posterior Rami of spinal nerves
Function: laterally flex vertebral column to contracting side; extend vertebral column and head