Lecture 11: Muscles of the Anterior Forearm

Question 1

How many muscle compartments is the forearm divided into and what is it divided by?

Answer 1

2 compartments divided by the interosseous membrane

Question 2

What are the superficial muscles of the anterior forearm?

Answer 2

Superficial Layer

• Pronator Teres
• Flexor Carpi Radialis
• Palmaris Longus
• Flexor Carpi Ulnaris

Question 3

What are the middle muscles of the anterior forearm?

Answer 3

Middle Layer:

- Flexor Digitorum Superficialis

Question 4

What are the deep muscles of the anterior forearm?

Answer 4

Deep Layer:

• Flexor Digitorum Profundus
• Flexor Pollicis Longus
• Pronator Quadratus

Question 5

Where do many of the anterior forearm muscles originate?

Answer 5

From the medial epicondyle of the humerus, thus we refer to that bony landmark as the “common flexor origin”

Question 6

What do the following terms mean?

• Teres
• Carpus
• Profundus
• Pollicis
• Quadratus

Answer 6

• Teres = cylindrical, tube-shaped
• Carpus = wrist
• Profundus = deep
• Pollicis = thumb
• Quadratus = square-shaped, 4-sided

Question 7

What does vestigial mean?

Answer 7

Organ or part of the body that has become absent and/or functionless in the course of evolution

Question 8

What is the pisiform?

Answer 8

Sesamoid bone formed within the tendon of flexor carpi ulnaris

Question 9

The concavity of the carpus is due to which bony landmarks?

Answer 9

• Tubercle of the scaphoid
• Tubercle of the trapezium
• Pisiform
• Hook of hamate