Anterior Forearm - Fxn&Innervation

Question 1

1st Anterior Compartment

Answer 1

Pronator teres
Flexor carpi radialis
Palmaris longus
Flexor carpi ulnaris

Question 2

Pronator Teres Innervation

Answer 2

Median Nerve

Question 3

Pronator Teres Function

Answer 3

Pronates forearm at elbow, assists in flexion at elbow

Question 4

Flexor Carpi Radialis Innervation

Answer 4

Median nerve

Question 5

Flexor Carpi Radialis Function

Answer 5

Flexes and abducts hand at wrist

Question 6

Palmaris Longus Innervation

Answer 6

Median nerve

Question 7

Palmaris Longus Function

Answer 7

Flexes hand at wrist, tenses palmar aponeurosis

Question 8

Palmar Aponeurosis

Answer 8

Insertion point for the tendon palmaris longus

Origin point for the palmaris brevis

Question 9

Flexor Carpi Ulnaris Function

Answer 9

Flexes and adducts hand at wrist

Question 10

2nd Anterior Compartment

Answer 10

Flexor Digitorum Superficialis

Question 11

Flexor Digitorum Superficialis Innervation

Answer 11

Median nerve

Question 12

Flexor digitorum Superficialis Function

Answer 12

Flexes phalanges of digits 2-5 at MP and PIP

Question 13

3rd Anterior Compartment

Answer 13

Flexor digitorum profundus
Flexor pollicis longus
Pronator quadratus

Question 14

Flexor Digitorum Profundus Function

Answer 14

Flexes phalanges at DIP

Question 15

Flexor Pollicis Longus Innervation

Answer 15

Anterior interosseous nerve

Question 16

Flexor Pollicis Longus Function

Answer 16

Flexes pollex (Thumb)

Question 17

Pronator Quadratus Innervation

Answer 17

Anterior interosseous nerve

Question 18

Pronator Quadratus Function

Answer 18

Pronates forearm at elbow

Question 19

Flexor Digitorum Profundus Innervation

Answer 19

Anterior interosseous nerve (bellies to digits 2 & 3)

Ulnar nerve (bellies to digits 4 & 5)

Question 20

Flexor Carpi Ulnaris Innervation

Answer 20

Ulnar nerve

Question 21

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Answer 21

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Question 22

What are the three muscles of the Snuff Box

Answer 22

Abductor pollicis longus
Extensor pollicis longus
Extensor pollicis brevis

Question 23

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Answer 23

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Question 24

Fxn and Innervation: Extensor pollicis brevis

Answer 24

Fxn: Extends pollex (thumb)
Innervation: Posterior interosseous nerve

Question 25

How do you identify extensor pollicis longus vs extesnor pollicis brevis

Answer 25

extensor pollicis brevis attaches more proximal on the thumb. Longus is the bigger muscle and attaches more distally.

Question 26

Fxn and Innervation: Abductor pollicis brevis

Answer 26

Fxn: Abducts pollex (thumb) Innervation: Recurrent branch of median nerve

Question 27

Fxn and Innervation: Flexor pollicis brevis

Answer 27

Fxn: Flexes pollex (thumb) Innervation: Recurrent branch of median nerve

Question 28

Fxn and Innervation: Opponens pollicis

Answer 28

Fxn: Opposes pollex (thumb) Innervation: Recurrent branch of median nerve

Question 28

Fxn and Innervation: Abductor digiti minimi

Answer 28

Fxn: Abducts digit 5 away from midline of hand Innervation: Deep branch of ulnar nerve

Question 29

Fxn and Innervation: Adductor pollicis

Answer 29

Fxn: Adducts pollex (thumb) Innervation: Deep branch of ulnar nerve

Question 30

Fxn and Innervation: Lumbricals

Answer 30

Fxn: Flexes at MP joint, extends at PIP/DIP Innervation: Median nerve (for digits 2/3), deep branch of ulnar nerve (for digits 4/5)

Question 31

Fxn and Innervation: Palmar interossei

Answer 31

Fxn: Adducts digits 2, 4, 5 toward midline of hand Innervation: Deep branch of ulnar nerve Mnemonic for action: PAD DAB (palmar adduct, dorsal abduct)

Question 32

Fxn and Innervation: Dorsal interossei

Answer 32

Fxn: Abducts digits 2-4 away from midline of hand (2 muscles for middle finger) Innervation: Deep branch of ulnar nerve Mnemonic for action: PAD DAB (palmar adduct, dorsal abduct)

Question 33

What forms the carpal tunnel?

Answer 33

Flexor retinaculum of hand (transverse carpal ligament)

Question 34

What are the four hand bones that anchor the carpal tunnel (flexor retinaculum)

Answer 34

Scaphoid Trapezium Pisiformis Hamate