The Hand

HS 1300 Dr. McWatt UWO Objectives: Identify and describe the bones, joints, and ligaments related to the hand, and explain the basic movements that occur at the digits, Identify the intrinsic muscles of the hand, explain their innervations, and describe their functions, Predict functional implications of nervous and musculoskeletal injuries to the hand

Names the hand joints

What are the joints of the digits supported by?

Digital collateral ligaments

What type of joints is the interphalangeal joints?

Hinge joints

What type of joint is the metacarpophalangeal joint?

Condyloid joints

Muscle group: Thenar eminence

Name muscle group, origin, insertion, main actions, innervations

Muscle group: Hypothenar eminence

Name muscle group, origin, insertion, main actions, innervations

Muscle group: Central eminence

Name muscle group, origin, insertion, main actions, innervation

Muscle group: Interosseus compartment

Name muscle group, origin, insertion, main actions, innervation

Muscle group: Other

Name muscle group, origin, insertion, main actions, innervation

What causes claw hand?

ulnar nerve injury at wrist

What nerve is the pain felt in ‘funny bone’ from?

Impact to the ulnar nerve

What causes ape hand?

Median nerve injury at wrist

What does ulnar nerve innervate?

majority of intrinsic muscles in hand (Think U)

What does the median nerve innervate?

Intrinsic muscles on the lateral side of the hand (think M)

What supplies the digits with blood?

Digital aa.

Principis pollicis a.

What can scaphoid fractures lead to?

Avascular necrosis (tissue death)

Anatomical snuff box borders

Medial (ulnar) border: Extensor pollicis longus

Lateral (radial) border: Abductor pollicis longus and Extensor pollicis brevis

Nerve map

What are dermatomes based on?

Embryological development of spinal segments