compartments and innervation

Question 1

superficial muscles of the back - extrinsic

Answer 1

• trapezius (most superficial)
• latissimus dorsi
• levator scapulae
• rhomboid major
• rhomboid minor

Question 2

innervation of trapezius

Answer 2

acessory nerve and C3 and C4 spinal nerves

Question 3

actions of trapezius

Answer 3

• elevates the scapula
• rotates the scapula

Question 4

innervation of the latissimus dorsi

Answer 4

thoracodorsal nerve

Question 5

action of the latissimus dorsi

Answer 5

extends, abducts, and medially rotates the upper limb

Question 6

innervation of the levator scapulae

Answer 6

dorsal scapula nerve

Question 7

actions of the levator scapulae

Answer 7

elevates the scapula

Question 8

innervation of the rhomboid major

Answer 8

dorsal scapula nerve

Question 9

actions of the rhomboid major

Answer 9

retracts and rotates scapula

Question 10

innvervation of the rhomboid minor

Answer 10

dorsal scapula nerve

Question 11

actions of the rhomboid minor

Answer 11

retracts and rotates the scapula

Question 12

superficial muscles of the back - intrinsic

Answer 12

• splenius capitis
• splenius cervices

Question 13

innervation of the splenius capitis

Answer 13

posterior rami of spinal nerves C3 and C4

Question 14

action of splenius capitis

Answer 14

rotate head to the same side

Question 15

innervation of splenius cervices

Answer 15

posterior rami of the lower cervical spinal nerves

Question 16

actions of splenius cervices

Answer 16

rotate the head to the same side

• two splenius muscle work to extend

Question 17

intermediate muscles of the back - intrinsic (erector spinae muscles)

Answer 17

• iliocostalis
• longissimus
• spinalis

Question 18

innervation of the iliocostalis

Answer 18

posterior rami of the spinal nerves

Question 19

actions of the iliocostalis

Answer 19

unilaterally flex the vertebral column and bilaterally to extend the vertebral column and head

Question 20

innervation of longissimus

Answer 20

posterior rami of the spinal nerves

Question 21

actions of the longissimus

Answer 21

unilaterally to laterally flex the spinal column and bilaterally to extend the vertebral column and head

Question 22

innervation of the spinalis

Answer 22

posterior rami of the spinal nerves

Question 23

actions of the spinalis

Answer 23

acts unilaterally to laterally flex the vertebral column and bilaterally to extend the vertebral column and neck

• erector spinae are the major extensors of the

Question 24

deep muscles of the back - intrinsic (transversospinalis)

Answer 24

• semispinalis
• multifidus
• rotators
• found in the groove between the

Question 25

innervation of the semispinalis

Answer 25

posterior rami of the spinal nerves

Question 26

actions of the semispinalis

Answer 26

extends and contralaterally rotates the head and spinal column

Question 27

innervation of the multifidus

Answer 27

posterior rami of the spinal nerves

Question 28

actions of the multifidus

Answer 28

stabilises the vertebral column

Question 29

innervation of the rotators

Answer 29

posterior rami of the spinal nerves

Question 30

actions of the rotators

Answer 30

stabilises the vertebral column and has a proprioceptive function

Question 31

intrinsic muscles of the shoulder

Answer 31

* deltoid * teres major

Question 32

innervation of the deltoid

Answer 32

axillary nerve

Question 33

actions of the deltoid

Answer 33

* major abductor of the arm * anteior part is involved in flexion and medial rotation * posterior part is involved in extension and lateral rotation

Question 34

innervation of the teres major

Answer 34

lower subscapular nerve

Question 35

actions of the teres major

Answer 35

adducts and extends at the shoulder, medially rotates the arm

Question 36

rotator cuff muscles

Answer 36

* supraspinatus * infraspinatus * subscapularis * teres minor

Question 37

innervation of the supraspinatus

Answer 37

suprascapular nerve

Question 38

action of the supraspinatus

Answer 38

abducts the arm

Question 39

innervation of the infraspinatus

Answer 39

suprascapular nerve

Question 40

action of the infraspinatus

Answer 40

laterally rotates the arm

Question 41

innervation of the subscapularis

Answer 41

upper and lower subscapular nerves

Question 42

actions of the subscapularis

Answer 42

medially rotates the arm

Question 43

innervation of the teres minor

Answer 43

axillary nerve

Question 44

actions of the teres minor

Answer 44

laterally rotates the arm

Question 45

muscles of the upper arm - anterior

Answer 45

* biceps brachii * brachialis * coracobrachialis

Question 46

innervation of the biceps brachii

Answer 46

musculocutaneous nerve

Question 47

actions of the biceps brachii

Answer 47

supination of the forearm and flexes the arm at the elbow and shoulder

Question 48

innervation of coracobrachialis

Answer 48

musculocutaneous nerve

Question 49

action of the coracobrachialis

Answer 49

flexion of the arm at the shoulder and weak adduction

Question 50

innervation of the brachialis

Answer 50

musculocutaneous nerve

Question 51

action of the brachialis

Answer 51

flexion at the elbow

Question 52

muscle of the upper arm - posterior

Answer 52

* triceps brachii * anconeous

Question 53

innervation of the triceps brachii

Answer 53

radial nerve

Question 54

action of the triceps brachii

Answer 54

extension of the arm at the elbow

Question 55

innervation of the anconeous

Answer 55

radial nerve

Question 56

action of the ancaeoneus

Answer 56

extends and stabilises the arm at the elbow joint

Question 57

anterior muscles of the forearm - superficial

Answer 57

* flexor carpi ulnaris * palmaris longus * flexor carpi radialis * pronator teres

Question 58

innervation of flexor carpi ulnaris

Answer 58

ulnar nerve

Question 59

actions of flexor carpi ulnaris

Answer 59

flexion and adduction at the wrist

Question 60

innervation of palmaris longus

Answer 60

median nerve

Question 61

innervation of palmaris longus

Answer 61

median nerve