Dissection 12

Question 1

Which muscles are supplied by the axillary nerve?

Answer 1

teres minor; deltoid

Question 2

what is the proximal attachment of the deltoid muscle?

Answer 2

lateral thrid of the clavicle and the inferior aspects of hte scapular spine and acromion

Question 3

What is the distal attachment of the deltoid muscle?

Answer 3

deltoid tuberosity of the humerus

Question 4

Which bursa is found between the supraspinatus tendon adn acromion process of the scapula?

Answer 4

subacromial bursa

Question 5

What is the sensory innervation to medial posterior arm?

Answer 5

anterior rami of spinal nerves C8, T1 and T2

Question 6

What is the lateral sensory innervation of the posterior arm?

Answer 6

anterior rami of spinal nerves C5 and C6 via the axillary nerve

Question 7

What is the muscle of the posterior compartment of the arm?

Answer 7

triceps brachii

Question 8

What is the innervation to the posterior compartment of the arm?

Answer 8

radial nerve

Question 9

What is the proximal attachment of triceps brachaii?

Answer 9

infraglenoid tubercle of the scapula (long head); superior (lateral) and inferior (medial) to the radial groove of the humerus

Question 10

What is the distal attachment of the triceps brachii?

Answer 10

form the triceps tendon which attaches to the olecranon processs of the ulna

Question 11

What is the action of the triceps brachii?

Answer 11

weak extension of the arm at the shoulder joint and extension of the forearm at the elbow joint

Question 12

What are hte borders of the quadrangular space that the axillary nerve is foundi n?

Answer 12

superio- teres minor, inferior-teres major, long head of triceps medially, humerus laterally

Question 13

What is the area of skin innervated by the axiallry nerve called?

Answer 13

the badge patch

Question 14

What spinal roots make up the radial nerve?

Answer 14

C5-T1

Question 15

Where is the radial nerve found in the posterior compartment of the arm?

Answer 15

radial groove of the humerus

Question 16

How does the radial nerve reach the posterior compartment of the forearm?

Answer 16

it leaves the posterior compartment of the arm to enter the lateral aspect of hte cubital fossa before returning to the posterior forearm

Question 17

What are vulnerable in a mid-shaft fracture of the humerus?

Answer 17

the radial nerve and its accompanying vessels due to their position in the radial groove

Question 18

What holds the muscles of the posterior compartment of the forearm as they cross the wrist?

Answer 18

extensor retinaculum

Question 19

Where is the brachioradialis located?

Answer 19

between the anterior and posterior compartments of the forearm

Question 20

What is the function of brachioradialis?

Answer 20

weak flexion of elbow, esp. when the forearm is semi-pronanted

Question 21

What is the proximal attachment of the superficial layer of muscles in the posterior forearm?

Answer 21

common extendor tendon on the lateral epicondyle of the humerus

Question 22

What are the muscles of the superficial layer of the posterior compartment of the forearm?

Answer 22

brachioradialis; extensor carpi radialis; extensor carpi bervis; exntensor digitorum; extensor digit minimi; extensor carpi ulnaris

Question 23

What is the function of extensor carpi radialis and extensor carpi brevis

Answer 23

extend and awbduct the wrist

Question 24

What is the function of extensor digitorum and extensor digitorum minimi?

Answer 24

extend the wrist joint and extend the digits (minimi is just the 5th metacarpal)

Question 25

What is the function of extensor carpi ulnaris?

Answer 25

extends and adducts the wrist

Question 26

what do the deeper layer of muscles of the posterior compartment of the forearm attach to proximally?

Answer 26

shasfts of the radius and ulna and the interosseous membrane

Question 27

What is the function of supinator?

Answer 27

supinates forearm at proximal and distal radioulnar joints

Question 28

What are the muscles of the deep layer of the post. forearm?

Answer 28

supinator; abductor pollicis longus; extensor pollicis longus; extensor pollicis brevis and extensor indicis

Question 29

Aside from supinator what is the common function of all the deep post. muscles?

Answer 29

extend the wrist

Question 30

What is the additional function of abductor pollicis longus?

Answer 30

abducts the thumb

Question 31

What is the additional function of extensor pollicis longus; extensor pollicis brevis?

Answer 31

extends the thumb

Question 32

What is the additional function of the extensor indicis?

Answer 32

extends the 2nd finger

Question 33

Where does the radial nerve divide into a superficial and deep branches?

Answer 33

just anterior to the lateral epicondyle

Question 34

How does the deep branch of the radial nerve reach the supinator muscle?

Answer 34

winds around the neck of the radius

Question 35

What does the deep branch of the radial nerve become once it passes through supinr

Answer 35

posterior interosseous nerve