Anterior Forearm Muscles

Question 1

Biceps Brachii

• Location
• BLMs
• ORIGIN
• INSERTION
• ACTION
• Innervate

Answer 1

Location
Superficial, anterior arm

• *BLMs**
• Coracoid process

ORIGIN
SHORT HEAD:

• Coracoid process of Scapula

LONG HEAD:

• Supraglenoid tubercle of Scapula
• *INSERT**
• Radial tuberosity
• Aponeurosis of Biceps Brachii (Bicipital Aponeurosis)

ACTION
“flex your elbow”

• FLEX elbow

NERVE
Musculocutaneous C5, C6

Question 2

Brachialis

• Location
• BLMs
• ORIGIN
• INSERTION
• ACTION
• Innervate

Answer 2

Location
Deep to Biceps Brachii

• *BLMs**
• Distal Biceps Tendon or Lateral arm

ORIGIN

• Distal half of anterior humerus
• *INSERT**
• Ulnar tuberosity
• Coronoid Process of Ulna

ACTION
“flex your elbow”

• FLEX elbow

NERVE
Musculocutaneous, small branch from Radial C5, C6

Question 3

Pronator Teres

• Location
• BLMs
• ORIGIN
• INSERTION
• ACTION
• Innervate

Answer 3

Location
Distal to Briceps Brachii tendon

• *BLMs**
• Medial epicondyle
• Shaft of Radius

ORIGIN

• Common flexor tendon from medial epicondyle
• Coronoid process of Ulna

INSERT
-Middle of Lateral surface of Radius

ACTION
“pronate your forearm against my resistance”

• PRONATE forearm
  *assist to FLEX elbow

NERVE
Median C6, C7

Question 4

Flexor Carpi Ulnaris

• Location
• BLMs
• ORIGIN
• INSERTION
• ACTION
• Innervate

Answer 4

Location
Superficial on medial forearm

• *BLMs**
• Medial epicondyle
• Shaft of ulna

ORIGIN
HUMERAL HEAD:

• Common flexor tendon from medial epicondyle

ULNAR HEAD:

• Posterior surface of proximal 2/3 of Ulna
• *INSERT**
• Pisiform
• Hook of Hamate
• Base of 5th metacarpal

ACTION
“Flex and/or adduct your wrist”

• FLEX wrist (RC joint)
• *assist to FLEX elbow (HU joint)*
• ADDUCT wrist (R/C joint)

NERVE
Ulnar C7, C8, T1

Question 5

Flexor Digitorum Superficialis

• Location
• BLMs
• ORIGIN
• INSERTION
• ACTION
• Innervate

Answer 5

Location
Intermediate Muscle layer on anterior forearm

• *BLMs**
• Medial epicondyle
• Shaft of ulna

ORIGIN

• Common flexor tendon from medial epicondyle
• Ulnar collateral ligament
• Coronoid Process of Ulna
• Interosseous membrane
• Proximal shaft of radius
• *INSERT**
• Both sides of each #2-#5 middle phalanges

ACTION“wiggle your fingers”

• FLEX fingers 2-5 (MCP and PIP joints)
• FLEX wrist (RC joint)

NERVE
Median C7, C8, T1

Question 6

Palmaris Longus

• Location
• BLMs
• ORIGIN
• INSERTION
• ACTION
• Innervate

Answer 6

Location
Superficial on Anterior forearm

• *BLMs**
• Medial epicondyle
• Belly medial to flexor carpi radialis

ORIGIN

• Common flexor tendon from medial epicondyle
• *INSERT**
• Flexor retinaculum
• Palmar aponeurosis

ACTION
“pinch your fingers together” (to highlight tendon)

• TENSE palmar fascia
• FLEX wrist (RC joint)
• *assist to FLEX elbow (HU joint)*

NERVE
Median C6, C7, C8, T1

Question 7

Flexor Pollicis Longus

• Location
• BLMs
• ORIGIN
• INSERTION
• ACTION
• Innervate

Answer 7

Location
*Interosseous membrane

BLMs
*interosseous membrane

ORIGIN

• Anterior surface of radius
• Anterior surface of interosseous membrane
• *INSERT**
• Base of distal phalanx of thumb

ACTION
“flex your thumb, flex your wrist”

• FLEX the thumb (CM, MCP, IP joint)
  *assist to FLEX wrist (RC joint)

NERVE
Median C6, C7, C8, TI

Question 8

Flexor Carpi Radialis

• Location
• BLMs
• ORIGIN
• INSERTION
• ACTION
• Innervate

Answer 8

Location
Superficial on Anterior forearm

• *BLMs**
• Medial epicondyle
• Belly lateral to palmaris longus

ORIGIN

• Common flexor tendon from medial epicondyle
• *INSERT**
• Base of #2-#3 metacarpals

ACTION
“flex and/or abduct your wrist”

• FLEX wrist (RC joint)
• *assist to FLEX elbow (HU joint)*
• ABDUCT wrist (RC joint)

NERVE
Median C6, C7, C8,

Question 9

Brachioradialis

• Location
• BLMs
• ORIGIN
• INSERTION
• ACTION
• Innervate

Answer 9

Location
Superficial

• *BLMs**
• Lateral epicondyle
• Styloid process of radius

ORIGIN

• Proximal 2/3 lateral supracondylar ridge of humerus
• *INSERT**
• Styloid process of radius

ACTION
“Flex elbow against my resistance”

• FLEX elbow (HU joint)
• *assist PRONATE and SUPINATE arm against resistance*

NERVE
Radial C5, C6