Dissection 4

Question 1

Nerve supply to deltoid

Answer 1

Axillary nerve

Question 2

Nerve supply to teres minor

Answer 2

Axillary nerve

Question 3

Attachments of deltoid

Answer 3

Proximal: lateral 1/3rd clavicle, inferior aspect of the spine of scapula and acromion

Distally: deltoid tuberosity of humerus

Question 4

Where is the subaromial bursa?

Answer 4

Between the supraspinatus tendon and the acromion

-bursitis would cause pain on abduction

Question 5

Common site for cardiac referred pain? and which nerve?

Answer 5

Medial aspect of posterior arm
-because of C8, T1 and T2 innervation –> VIA THE INTERCOSTOBRACHIAL NERVE, medial and posterior cutaneous nerves of arm and medial cutaneous nerve of forearm

Question 6

Sensory innervation of medial side of posterior arm

Answer 6

C8/T1/T2

Question 7

Sensory innervation of lateral side of posterior arm?

Answer 7

Axillary nerve (C5 and C6)

Question 8

Axillary nerve is made from the rami of which nerves?

Answer 8

C5 and C6

Question 9

Only muscle of the posterior compartment of arm?

Answer 9

Triceps

Question 10

Innervation of triceps?

Answer 10

Radial nerve (NERVE OF POSTERIOR COMPARTMENT OF ARM)

Question 11

Triceps proximal attachments?

Answer 11

Infraglenoid tubercle of scapula (long head)

Radial groove of humerus (inferior and superior head)

Question 12

Distal attachment of triceps?

Answer 12

All three heads combine to form one tendon which attaches to the olecranon process of ulna

Question 13

Action of triceps?

Answer 13

Weak extensor of arm at shoulder joint

Extension of arm at elbow joint

Question 14

Where is the axillary nerve found?

Answer 14

The quadrangular space

Question 15

What is the quadrangular space?

Answer 15

superiorly: teres minor
inferiorly: teres major
laterally: humerus
medially: long head of triceps

Question 16

How could you test function of axillary nerve?

Answer 16

Ask patient to abduct upper limb beyond 15 degrees

Badge patch

Question 17

Branch of brachial artery in the radial groove?

Answer 17

Profunda brachii

Question 18

Radial nerve is made from which spinal nerves?

Answer 18

C5-T1

Question 19

Where is the radial artery found?

Answer 19

In the radial groove

Question 20

Nerve that could be damaged in a mid-shaft fracture (spiral) fracture of the humerus, and how could you test this

Answer 20

Radial nerve

test in the hand to avoid pain

Question 21

Route of the radial nerve

Answer 21

Passes from the axilla into the posterior compartment of the arm (found in radial groove)
Then leaves posterior compartment of the arm to enter the LATERAL aspect of the cubital fossa
Then returns to posterior compartment of forearm

(kind of back front back)

Question 22

Extendion, abduction and adduction of wrist
Extensors of fingers
-are these muscles deep or superficial and where do they attach?

Answer 22

Superficial, attach proximally to the common extensor tendon on the lateral epicondyle of the humerus

Question 23

Extension and abduction of thumb and supination of forearm at proximal and distal radial ulnar joints
Are these muscles deep or superficial
And where do they attach?

Answer 23

Deep

attach to the shafts of the radius and ulna and the interosseous membrane

Question 24

Muscle found at the boundary between the anterior and posterior aspects of the forearm
What movement does it produce?

Answer 24

Brachioradialis

Flexion of the semi-pronated forearm (e.g. drinking from cup)

Question 25

What holds the tendons in place as they cross the wrist?

Answer 25

Extensor retinaculum

Question 26

When is the deep branch of the radial nerve renamed the posterior interosseous nerve?

Answer 26

When it passes through the supinator muscle

Question 27

Nerve supply to the posterior compartment of the forearm?

Answer 27

Posterior interosseous nerve

Question 28

Common extensor origin

Answer 28

Lateral epicondyle

Question 29

In the clinic, a lesion in the radial nerve results in what?

Answer 29

A wrist drop

Question 30

Innervation of triceps

Answer 30

C6, C7, C8 (radial nerve)