Muscles of Arm

Question 1

Biceps Brachialis

Proximal Attachment

Distal Attachment

Action

Innervation

Blood Suppy

Answer 1

• Proximal Attachment:
  
  • Long Head: Supraglenoid tubercle of scapula
  • Short Head: Tip of coracoid process of scapula
• Distal Attachment: Radial tuberosity
• Action: Flexes and supinates forearm at elbow
• Innervation: Musculocutaneous nerve
• Blood Supply: Brachial artery

Question 2

Brachialis

Proximal Attachement

Distal Attachment

Action

Innervation

Blood Supply

Answer 2

• Proximal Attachment: Humerus
• Distal Attachment: Tuberosity of ulna
• Action: Flexes forearm at elbow
• Innervation: Musculocutaneous nerve
• Blood Supply: Radial recurrent artery, brachial artery

Question 3

Coracobrachialis

Proximal Attachement

Distal Attachment

Action

Innervation

Blood Supply

Answer 3

• Proximal Attachment: Coracoid process of scapula
• Distal Attachment: Humerus
• Action: Flexes and adducts arm at shoulder
• Innervation: Musculocutaneous nerve
• Blood Supply: Brachial artery

Question 4

Triceps Brachii

Proximal Attachement

Distal Attachment

Action

Innervation

Blood Supply

Answer 4

• Proximal Attachment:
  
  • Long Head: Infraglenoid tubercle of scapula
  • Lateral Head: Humerus superior to radial head
  • Medial Head: Humerus inferior to radial head
• Distal Attachment: Olecranon process of ulna
• Action: Extends forearm at elbow
• Innervation: Radial nerve
• Blood Supply: Branch of profunda brachii artery

Question 5

Anconeous

Proximal Attachement

Distal Attachment

Action

Innervation

Blood Supply

Answer 5

• Proximal Attachment: Lateral epicondyle of humerus
• Distal Attachment: Olecranon process of ulna
• Action: Extends forearm (assists triceps brachii)
• Innervation: Radial nerve
• Blood Supply: Deep brachial artery