Axilla and Arm

Question 1

What are the boundaries of the axilla?

Answer 1

• anterior: pec. major & minor
• medial: serr. ant.
• lateral wall: proximal shaft of humerus
• posterior: subscapularis, teres major, lat dorsi
• base: skin (armpit)

Question 2

Where is the brachial plexus located?

Answer 2

between the ant. and middle scalene muscles

Question 3

What is the arm innervation from the brachial plexus?

Answer 3

• post. cord> radial nerve> post. arm
• lat. cord> musculocutaneous & median nerve> ant. arm
• medial cord> median nerve & ulnar nerve> ant. arm

Question 4

What is the bony support of the arm?

Answer 4

humerus

Question 5

What are muscles that attach to the humerus?

Answer 5

• biceps brachii
• coricobrachialis
• brachialis
• tricpes brachii
• anconeus

Question 6

What is the arterial supply of the posterior and anterior arm?

Answer 6

• post: deep brachial artery
• ant: brachial artery

Question 7

Around the elbow, what arteries anastamose with each other?

Answer 7

ulnar and radial collateral anastamose with ulnar and radial recurrent

Question 8

What is the motor innervation of the arm?

Answer 8

• post: radial nerve
• ant: musculocutaneous nerve

Question 9

What is the sensory innervation of the arm?

Answer 9

• radial
• axillary
• medial brachial cutaneous
• medial antibrachial cutaneous

Question 10

What muscles are a part of the arm?

Answer 10

• ant: biceps brachii, coracobrachialis, brachialis
• post: triceps brachii, anconeus

Question 11

What is the proximal attachment of the biceps brachii?

Answer 11

• long head to the supraglenoid tubercle
• short head ot the coricoid process

Question 12

What is the distal attachment of the biceps brachii?

Answer 12

• bicipital tendon to the radial tuberosity
• bicipital aponeurosis

Question 13

What is the proximal attachment of coricobrachialis?

Answer 13

coricoid process

Question 14

What is the distal attachment of coricobrachialis?

Answer 14

medial shaft of humerus

Question 15

What is the proximal attachment of the brachialis?

Answer 15

• mid shaft
• ant. surface of humerus

Question 16

What is the distal attachment of brachialis?

Answer 16

coronoid process of ulna

Question 17

What artery and nerve run along the spinal groove?

Answer 17

deep brachial artery & radial nerve

Question 18

What are the proximal attachments of triceps brachii?

Answer 18

• long head -> infraglenoid tubercle
• lat. head -> post. surface of humerus above spinal groove
• med. head -> post. surface of humerus below spinal groove

Question 19

What is the distal attachment of triceps brachii?

Answer 19

olecranon process of forearm (elbow)

Question 20

What is the proximal attachment of anconeus?

Answer 20

lat. epicondyle of humerus

Question 21

What is the distal attachment of anconeus?

Answer 21

olecranon process

Question 22

What are the movements at the elbow joint?

Answer 22

• humero-ulnar: flexion + extension (brachialis, triceps, anconeus)
• humero-radial: flexion + extension (biceps, brachioradialis)
• proximal radio-ulnar: rotation

Question 23

What is the difference between dermatomes and peripheral nerves?

Answer 23

• dermatomes -> 1 spinal nerve
• perioheral -> many nerves

Question 24

What is the path of the brachial artery forming the ulnar and radial artery?

Answer 24

• brachial > ulnar collateral > ulnar recurrent > ulnar art.
• brachial > deep brachial art. > radial collateral art. > radial recurrent art. > radial art.

Question 25

What is the proximal attachment of the brachioradialis?

Answer 25

mid-shaft/lat. surface of humerus

Question 26

What is the distal attachment of the brachioradialis?

Answer 26

styloid process

Question 27

What 2 muscles cross at 2 joints?

Answer 27

triceps and biceps