Anterior and Posterior Arm

Question 1

Coracobrachialis

Answer 1

O: coracoid process
I: humerus, in line with lesser tuberosity
A: flexion, adduction, internal rotation of the arm
Innervation: musculocutaneous nerve
Arterial Supply: brachial artery

Clinical: lesion of musculocut nerve –> compression of muscle –> weakness in flexion

Question 2

Brachialis

Answer 2

O: anterior surface of distal half of humerus
I: ulnar tuberosity
A: flexion at the elbow
Innervation: musculocutaneous nerve (and radial nerve)
Arterial Supply: brachial artery

Question 3

Biceps Brachii

Answer 3

Long head:
O: supra glenoid tubercle of scapula 
Short head: 
O: coracoid process 
Both:
I: radial tuberosity
A: flexion at elbow, supination of forearm; flexion abduction and internal rotation of arm
Innervation: musculocutaneous nerve
Arterial Supply: brachial artery

Question 4

Borders of the Quadrangular Space

Answer 4

Inferior border of teres minor
Superior border of teres major
Lateral border of long head of triceps brachii
Medial border of humerus

Question 5

What are the contents of the quadrangular space?

Answer 5

axillary nerve

posterior circumflex humeral artery

Question 6

Contents of the triceps hiatus

Answer 6

radial nerve

profunda brachii artery

Question 7

Boundaries and contents of the triangular space

Answer 7

inferior border of teres minor
superior border of teres major
medial border of long head of triceps brachii

circumflex scapular artery

Question 8

Boundaries and Contents of Scapular Notch

Answer 8

superior transverse scapular ligament and scapula

suprascapular artery and nerve

Question 9

Triceps Brachii

Answer 9

O:
long head: infraglenoid tubercle
lateral head: lateral intermuscular septum and posterior humerus superior to radial tuberosity
medial head: medial intermuscular septum and posterior humerus inferior to radial tuberosity
I: olecranon of ulna
A: extension of forearm, extension and adduction of arm (except medial head)
Innervation: radial nerve
Arterial supply: deep brachial artery