Muscles of the Posterior Extrinsic Hand

Question 1

Name the Origin, Insertion, Action, and Nerve for:

Abductor Pollicis Longus

Answer 1

O: Posterior Radius & Posterior Ulna

I: Base of 1st MC

A: ABD 1st CMC

N: Posterior Interosseous N

Question 2

Name the Origin, Insertion, Action, and Nerve for:

Extensor Pollicis brevis

Answer 2

O: Posterior Radius

I: Base 1st PP

A: Ext 1st CMC & MCP

N: Posterior Interosseous N

Question 3

Name the Origin, Insertion, Action, and Nerve for:

Extensor Pollicis Longus

Answer 3

O: Posterior Ulna

I: Base 1st DP

A: Ext 1st CMC, MCP, IP

N: Posterior Interosseous N

Question 4

Name the Origin, Insertion, Action, and Nerve for:

Extensor Indicis

Answer 4

O: Posterior Ulna

I: 2nd MP & DP

A: Ext 2nd MCP-DIP, Ext - wrist

N: Posterior Interosseous N