Intrinsic Hand Muscles Flashcards
Intrinsic hand muscles allow for…
Precision grip (dexterity)
Most intrinsic muscles are innervated by which nerve?
Ulnar nerve
Except for the thumb
3 thenar muscles
Muscles of the thumb
Abductor pollicis breveis
Flexor pollicis brevis
Opponens pollicis
Thenar muscles are innervated by…
The recurrent branch of the median nerve
3 hypothenar muscles
Muscles of the pinky
Abductor digiti minimi
Flexor digiti minimi
Opponens digiti minimi
Hypothenar muscles are innervated by…
The ulnar nerve
Adductor thumb is called…
And innervated by…
Adductor pollicis
Ulnar nerve
Lumbricals
- Origin
- Function
- Innervation
- From the tendons of the flexor digitorum profundus muscle
- Flexion of fingers at MCP and extension at PIP and DIP
- Median (1 and 2) and ulnar nerves (3 and 4)
Attachment to what structural allows the lumbricals to extend at PIP and DIP?
Extensor hood
DABs
Dorsal interossei abduct the fingers
4 of them
PADs
Palmar interossei adduct the fingers
3 of them
Cutaneous innervation of the hand
Ulnar nerve branches to pinky finger, half of ring finger, and straight down through hand
Median nerve innervates rest of anterior side, and fingertips
Radial nerve innervates dorsal side of hand
Where do you test the 1. Median 2. Ulnar 3. Radial nerves?
- Tip of index finger
- Tip of pinky finger
- Between first 2 metacarpals
CMC joints
Carpometacarpal joints
MCP joints
Metacarpophalangeal joints
