Lab 6: Arm and Cubital Fossa

Question 1

Contents of the Anterior compartment of the arm

Answer 1

• 3 muscles
  
  • Biceps brachii
  • Coracobrachialis
  • Brachialis
• 1 Nerve
  
  • Musculocutaneous

Question 2

Contents of the Posterior compartment of the arm

Answer 2

• 2 muscles
  
  • Triceps brachii
  • anconeus
• Neurovasculature
  
  • Radial N
  • Profunda Brachii A, V
  • Basilica Veins

Question 3

Components of the intermuscular septum

Answer 3

• Brachial A
• Brachial and basilica V
• Median N
• Ulnar N
• MABC N

Question 4

Path of tendon of long head of biceps brachii

Answer 4

• Passes deep to enter bicipital groove
• courses over top of glenohumeral joint
• Merges with superior portion of glenoid labrum
• attaches to the supraglenoid tubercle of the scapula

Question 5

What nerve pierces the coracobrachialis

Answer 5

musculocutaneous

Question 6

Attachment of coracobrachialis

Answer 6

• distal insertion at midshaft of humerus

Question 7

what muscle lies deep to the biceps brachii

Answer 7

Brachialis

Question 8

brachialis (location and insertion)

Answer 8

deep to biceps brachii
distal half of arm
crosses elbow joint
Inserts on ulnar tuberosity

Question 9

Biceps brachii tendon attachment

Answer 9

attaches to radial tuberosity

Question 10

Bicipital aponeurosis attachment

Answer 10

spreads out medially to antebrachial fascia

Question 11

Lateral Cutaneous Nerve of forearm

Answer 11

Musculocutaneous nerve named lateral cutaneous nerve after innervating anterior compartment muscles

Question 12

What nerve runs along side the cephalic being from the cubital fossa to the forearm?

Answer 12

Lateral cutaneous nerve (distal musculocutaneous)

Question 13

Pathway of Musculocutaneous nerve

Answer 13

• emerges from lateral cord of brachial plexus
• Through coracobrachialis
• Runs in plane between biceps brachii and brachialis muscles
• continues distally as the lateral cutaneous nerve after innervating anterior compartment muscles

Question 14

What nerve follows the Basilic vein from plexus to elbow

Answer 14

Medial Cutaneous Nerve of forearm (MABC)

Question 15

Median nerve pathway in arm

Answer 15

no branching

crosses from lateral to medical side of the brachial artery at midarm

Question 16

Ulnar nerve pathway in distal arm

Answer 16

leaves medial intermuscular septum and travels to posterior compartment toward cubital tunnel
accompanied by superior ulnar collateral branch of brachial artery

Question 17

Which artery does the ulnar nerve follow through the distal arm

Answer 17

Superior ulnar collateral branch of the brachial artery

Question 18

Axillary A –> Brachial A transition

Answer 18

changes names at the inferior border of teres major

Question 19

Triangular interval contents

Answer 19

• Profunda brachii artery (deep brachial)

- Radial Nerve

Question 20

Branches of the brachial artery

Answer 20

Profunda Brachial Artery (1st branch)
Superior Ulnar Collateral Artery
Inferior Ulnar Collateral Artery

Question 21

Inferior ulnar collateral artery pathway

Answer 21

• passes anterior to the elbow

Question 22

lateral boundary of the cubital fossa

Answer 22

brachiradialis

Question 23

medial boundary of the cubital fossa

Answer 23

pronator teres

Question 24

superior boundary of cubital fossa

Answer 24

epicondyle line

Question 25

roof of cubital fossa

Answer 25

bicipital aponeurosis

Question 26

floor of cubital fossa

Answer 26

brachialis and supinator

Question 27

Order of large structures on the cubital fossa

Answer 27

lateral- tendons of biceps brachii intermediate- brachial artery Medial- median nerve

Question 28

terminal bifurcation of brachial artery

Answer 28

``` Ulnar artery (medial) Radial artery (lateral) ```

Question 29

Vena comitantes

Answer 29

veins in distal limbs are paired Major functions 1.) heat exchange 2.) arterial venous pump

Question 30

Aponeurosis as barrier

Answer 30

provides a barrier to deeper structures (Median N and Brachial A) but allow for puncture of superficial veins

Question 31

Attachment of heads of triceps brachii

Answer 31

- all three heads ( long, lateral, and medial) attach distally to the olecrenon processof the ulna NOTE: Medial head is found deep to the long head

Question 32

What lies in radial groove of the humerus

Answer 32

Radial nerve and profunda brachii artery

Question 33

Bifurcation of profunda brachii

Answer 33

occurs near shaft of humerus - middle collateral artery - Radial collateral artery

Question 34

What artery follows the radial nerve into the intermuscular septum

Answer 34

Radial artery (bifurcation of profunda brachii)

Question 35

Point of triangle surrounding anconeus muscle

Answer 35

- lateral epicondyle - olecranon process - 3 inches down exposed ulnar shaft

Question 36

Which ligament is the most lateral in attaching the coracoid process and the clavicle?

Answer 36

Trapezoid ligament

Question 37

which two muscles originate from the coracoid process

Answer 37

Coracobrachialis | Short head of biceps brachii