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 Innveration

Answer 16

Dorsal scapular nerve and ventral rami of cervical spinal nerves

Question 16

Levator Scapulae Insertion

Answer 16

Medial border of scapula from spine to inferior angle

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