Dissection 4 Flashcards
Nerve supply to deltoid
Axillary nerve
Nerve supply to teres minor
Axillary nerve
Attachments of deltoid
Proximal: lateral 1/3rd clavicle, inferior aspect of the spine of scapula and acromion
Distally: deltoid tuberosity of humerus
Where is the subaromial bursa?
Between the supraspinatus tendon and the acromion
-bursitis would cause pain on abduction
Common site for cardiac referred pain? and which nerve?
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
Sensory innervation of medial side of posterior arm
C8/T1/T2
Sensory innervation of lateral side of posterior arm?
Axillary nerve (C5 and C6)
Axillary nerve is made from the rami of which nerves?
C5 and C6
Only muscle of the posterior compartment of arm?
Triceps
Innervation of triceps?
Radial nerve (NERVE OF POSTERIOR COMPARTMENT OF ARM)
Triceps proximal attachments?
Infraglenoid tubercle of scapula (long head)
Radial groove of humerus (inferior and superior head)
Distal attachment of triceps?
All three heads combine to form one tendon which attaches to the olecranon process of ulna
Action of triceps?
Weak extensor of arm at shoulder joint
Extension of arm at elbow joint
Where is the axillary nerve found?
The quadrangular space
What is the quadrangular space?
superiorly: teres minor
inferiorly: teres major
laterally: humerus
medially: long head of triceps
How could you test function of axillary nerve?
Ask patient to abduct upper limb beyond 15 degrees
Badge patch
Branch of brachial artery in the radial groove?
Profunda brachii
Radial nerve is made from which spinal nerves?
C5-T1
Where is the radial artery found?
In the radial groove
Nerve that could be damaged in a mid-shaft fracture (spiral) fracture of the humerus, and how could you test this
Radial nerve
test in the hand to avoid pain
Route of the radial nerve
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)
Extendion, abduction and adduction of wrist
Extensors of fingers
-are these muscles deep or superficial and where do they attach?
Superficial, attach proximally to the common extensor tendon on the lateral epicondyle of the humerus
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?
Deep
attach to the shafts of the radius and ulna and the interosseous membrane
Muscle found at the boundary between the anterior and posterior aspects of the forearm
What movement does it produce?
Brachioradialis
Flexion of the semi-pronated forearm (e.g. drinking from cup)
What holds the tendons in place as they cross the wrist?
Extensor retinaculum
When is the deep branch of the radial nerve renamed the posterior interosseous nerve?
When it passes through the supinator muscle
Nerve supply to the posterior compartment of the forearm?
Posterior interosseous nerve
Common extensor origin
Lateral epicondyle
In the clinic, a lesion in the radial nerve results in what?
A wrist drop
Innervation of triceps
C6, C7, C8 (radial nerve)
