more hand a forearm stuff

Extrinsic is

Power (grip/release)

Intrinsic is

Precision (control and coordination)

Extrinsic muscles are located

In the forearm

Extrinsic motion’s function

Power and large movements

Intrinsic muscles are located in

In the hand

Intrinsic muscles function

Precision and control

Front of forearm has the

Wrist/finger flexors

Back of forearm has the

Wrist/finger extensors

Thenar eminence is the

Thumb muscle

Hypothenar eminence is the

Pinky muscles

Between the fingers is the

Interossei

Key movements of wrist

• Flexion

• Extension

• Radial deviation (toward thumb)

• Ulnar deviation (toward pinky)

Key movements of fingers

• Flexion (bend)

• Extension (straighten)
  Abduction (spread fingers)

• Adduction (bring together)

DAB stands for

dorsal interossei-abducts

PAD stands for

palmar interossei- adducts

Key movements of the Thumb

• Flexion / Extension

• Abduction / Adduction

• Opposition (touch thumb to fingers)

Weak flexors make

Gripping and holding objects hard

Weak extensors make

releasing objects hard

Weak intrinsics make

Buttoning, writing, and fine motor coordination hard

limited ROM makes

Dressing and grooming hard

A patient cannot open their hand to release an object. Which muscle group is MOST involved?

Extrinsic extensors

Which movement is MOST associated with intrinsic hand muscles?

Finger coordination

A patient has difficulty spreading their fingers apart. Which muscles are involved?

Dorsal interossei

Which area of the body contains the extrinsic hand muscles?

Forearm

A patient has weak grip strength.

• What muscle group is involved?

• What is one simple intervention?

• extrinsic

• squeezing a stress ball

A patient cannot button their shirt

• What muscle group is MOST important?

• Why?

• intrinsic

• Hand muscles / Precison

A patient cannot bring their fingers together.

What movement is limited?

What muscles are involved?

• adduction

• intrinsic (palmar interossei)