Movements and muscles of the hand Flashcards
Week 2
Bones of hand
Carpals –> metacarpals –> phalanges
How many lumbrical muscles are there?
4
What do lumbrical muscles link?
Extensor and flexor tendons
Denneravation of what muscles is the basis for the ‘ulnar claw’ and ‘hand of benediction’?
Lumbrical muscles
Action of the lumbricals at joints
Flex MCP joints, extend IP joints
Innervation of the lumbricals:
- Lateral 2 (index and middle) = median nerve
- Medial 2 (ring and little) = ulnar nerve
Function of muscles of the thenar eminence
Abduction, adduction, extension of thumb
Function of muscles of the hypothenar eminence
Abduction, adduction, extension of little finger
Nerve supply of the thenar eminence
Median nerve
Nerve supply of the hypothenar eminence
Ulnar nerve
Thenar muscles (3):
- Opponens Pollicis
- Abduction pollicis brevis
- Flexor pollicis brevis
Hypothenar muscles (3):
- Opponens digiti minimi
- Abductor digiti minimi
- Flexor digiti minimi brevis
Interrossei muscles can be divided into:
- Dorsal branch
- Palmar branch
Function of dorsal interorssei (DAB)
Abbduction
Which thenar muscle is supplies by the ulnar nerve?
Adductor pollicis
The hand of benediction occurs in what type of nerve injury?
Median nerve
Claw hand occurs in what type of nerve injury?
Ulnar nerve
Wrist drop occurs in what type of nerve injury?
Radial nerve
Hand of benediction can be seen when the patient is asked to…
Make a fist
What happens to the fingers in the ulnar claw.
hyperextension at MCP joints, flexion of IP joints
How many digital nerves are there per vessel?
4 (2 palmar, 2 dorsal)
