Deep Hand Muscles

Question 1

Lumbricals

Answer 1

O: Radial Side of the Flexor Digitorum Profundus

I: Radial Side of the Extensor Hood

A: Flexes MCP Joints, Extends IP Joints

N: 1 and 2: Median Nerve (C8-T1)

3 and 4: Ulnar Nerve (C8-T1)

Question 2

Palmar Interossei

Answer 2

O: Palmar Surface of Metacarpals 2, 4, and 5

I: Proximal Phalanx and Extensor Hood of Digits 4 and 5

A: Adducts MCP Joints, Extends IP Joints

N: Ulnar Nerve (C8-T1)

Question 3

Dorsal Interossei

Answer 3

O: Adjacent Sides of Metacarpals

I: Proximal Phalanx and Extensor Hood of Digits 3, 4, and 5

A: Abducts and flexes MCP Joints, Extends IP ion Joints

N: Ulnar Nerve (C8-T1)