Muscles of the Wrist and Hand 2

Question 1

Extensor Digitorum (Action)

Answer 1

Extension at Metacarpophalangeal (MCP) joints.

Question 2

Extensor Indicis (Action)

Answer 2

Extension of index finger at MCP joint.

Question 3

Extensor Digit Minimi (Action)

Answer 3

Extension of little finger (5th digit) at MCP joint.

Question 4

Extensor Pollicis Longus & Brevis

Answer 4

Extension of thumb at MCP joint.

Question 5

Abductor Pollicis Longus

Answer 5

Abduction of thumb and wrist.

Question 6

What is a power grip? Name three examples.

Answer 6

Object is in the palms of the hand, with the thumb and fingers around the object. Examples: Cylindrical; Spherical; Hook grip.

Question 7

What is a precision grip? Name three examples.

Answer 7

Object is in the fingers. Examples: Pinch grip (pads of fingers); Pincer (tips of finger tips); Tripod.

Question 8

Talk about Carpal tunnel syndrome and how that comes to be.

Answer 8

Long periods of time typing and similar activities can be associated with carpal tunnel syndrome. The carpal tunnel is the tunnel where flexor digitorum tendons run through. Muscles that are overused can inflame and compress the area, resulting in nerve compression. Motor units cannot be innovated properly when this happens, resulting in carpal tunnel.

Question 9

Name the six different joints beginning from the radius and ulna connecting with the carpals, to the final interphalangeal joints.

Answer 9

Radiocarpal Joint
Midcarpal Joint (between the two carpal rows)
Carpometacarpal Joint (between carpal and metac.)
Metacarpophalangeal (MCP) Joint (metac to phalang.)
Proximal Interphalangeal Joint (PIP)
Distal Interphalangeal Joint (DIP)