Intrinsic Muscles of the Hand

Question 1

Thenar Muscle Group

Answer 1

Allows thumb to
oppose other digits
* Provides supplemental
flexion/abduction of
thumb

Question 2

Hypothenar Muscle
Group

Answer 2

Contributes to
movement of little
finger
* Important for grasping
objects

Question 3

Interossei Palmar pictured

Answer 3

Origin:
* Shafts of metacarpals
Insertion:
* Extensor expansion
Action:
* Adduction/abduction of
digits

Question 4

Interossei –Dorsal pictured

Answer 4

Origin:
* Shafts of metacarpals
Insertion:
* Extensor expansion
Action:
* Adduction/abduction of
digits

Question 5

Lumbricals

Answer 5

Lumbricals
Origin:
* Tendon of Flexor
Digitorum Profundus
Insertion:
* Extensor expansion (digits
2-5)
Action:
* Flexion at MCP; Extension
at IP (digits 2-5