Hand- Interossei Hand Muscles

Question 1

WHere do the dorsal and palmar interossei lie

Answer 1

Between the metacarpals of the hand

Question 2

Dorsal interossei

Answer 2

• Bipennate
• Originate on the adjacent sides of the metacarpals
• Insert onto the lateral sides of the proximal phalanges of digits 2 and 3, and onto the medial sides of the proximal
phalanges of digits 3 and 4.
• Abduct digits 2-4; they do NOT act upon digits 1 and 5.

Question 3

1st Palmar interossei

Answer 3

• Unipennate
First palmar interossei (often poorly developed or absent)
• Originates on the medial side of the first metacarpal
• Inserts into the base of the proximal phalanx of digit 1.

Question 4

2nd palmar interossei

Answer 4

Second palmar interossei
• Originates on the medial side of the second metacarpal

• Inserts into the proximal phalange of digit 2.

Question 5

3rd palmar interossei

Answer 5

• Originates on the lateral side of metacarpal 4

* Inserts into the lateral side of the proximal phalange of digit 4.

Question 6

4th palmar interossei

Answer 6

• Originates on the lateral side of the 5th metacarpal

* Inserts into the proximal phalange of digit 5.

Question 7

Where do both the dorsal and palmar interossei insert?

Answer 7

extensor hoods