Lecture 5.2: Anterior and Posterior Arm

Question 1

Overview of Arm (Bone? Compartments? Muscles? Nerves?)

Answer 1

• 1 Bone: Humerus
• 2 compartments (Flexor/Anterior and Extensor/Posterior)
• 4 arm muscles ()
• 2 nerves (Radial and Musculocutaneous)

Question 2

What part of the arm is supplied by the Musculocutaneous Nerve?

Answer 2

Anterior Compartment/ Flexors

Question 3

What part of the arm is supplied by the Radial Nerve?

Answer 3

Posterior Compartment/ Extensors

Question 4

What muscles are part of the Anterior Arm Compartment?

Answer 4

• Biceps Brachii:

 1) Long head
 2) Short head

• Brachialis
• Coracobrachialis

Question 5

What muscles are part of the Posterior Arm Compartment?

Answer 5

Triceps brachii:

1) Long head
2) Lateral head
3) Medial head

Question 6

Muscles of Anterior Arm Compartment: Biceps Brachii

Answer 6

• Short Head and Long Head
• Distal attachment —> Radial Tuberosity

Acts on:
• Shoulder: Flexion
• Elbow: Flexion and supination

Question 7

Muscles of Anterior Arm Compartment: Brachialis

Answer 7

• Primary flexor at the elbow joint

* Attaches distally on tuberosity of ulna

Question 8

Muscles of Anterior Arm Compartment: Coracobrachialis

Answer 8

• Coracoid —> Mid-Humerus
• Pierced by Musculocutaneous Nerve

Acts on Glenohumeral Joint:
• Flexion
• Adduction

Question 9

Where does the Long Head of Bicep Attach?

Question 10

What is a Popeye Deformity?

Answer 10

• Rupture of the tendon of the long head of the biceps
• Torn from attachment at the supraglenoid tubercle of the scapula
• Detached muscle belly forms a ball.

Question 11

What causes a Popeye Deformity?

Answer 11

Wear and tear of muscle/ tendon

Question 12

Muscles of Posterior Arm Compartment: Triceps Brachii

Answer 12

• Long, Medial and Lateral Head
• Shoulder & elbow extension
• Radial n.

Question 13

Posterior Arm Compartment: Quadrangular Space

Answer 13

Axillary nerve & posterior circumflex arteries travel through here and around the surgical neck of humerus

Question 14

Posterior Arm Compartment: Triangular Interval & Spiral Groove

Answer 14

Radial nerve & profunda artery travel through space and groove

Question 15

Posterior Arm Compartment: Triangular Space

Answer 15

Circumflex scapular artery

Question 16

SLIDE 17 IMAGES

Answer 16

LOOK AT THEM AND MEMORISE

Question 17

Upper Limb Movement: Shoulder Flexion Nerve?

Answer 17

C5

Question 18

Upper Limb Movement: Shoulder Extension Nerve Root?

Answer 18

C6-8

Question 19

Upper Limb Movement: Shoulder Abduction Nerve Root?

Answer 19

C5

Question 20

Upper Limb Movement: Shoulder Adduction Nerve Root?

Answer 20

C6-8

Question 21

Upper Limb Movement: Shoulder Lateral Rotation Nerve Root?

Answer 21

C5

Question 22

Upper Limb Movement: Shoulder Medial Rotation Nerve Root?

Answer 22

C6-8

Question 23

Upper Limb Movement: Elbow Flexion Rotation Nerve Root?

Answer 23

C5-6

Question 24

Upper Limb Movement: Elbow Extension Rotation Nerve Root?

Answer 24

C7-8

Question 25

Nerve Roots of Deep Tendon Reflexes: Biceps

Answer 25

C5 + C6

Question 26

Nerve Roots of Deep Tendon Reflexes: Triceps

Answer 26

C7 and C8

Question 27

Nerve Roots of Deep Tendon Reflexes: Brachio-radialis

Answer 27

C5 + C6