post forearm

Question 1

muscles in superficial lat layer (3)

Answer 1

• Brachioradialis
• Extensor carpi radialis longus
• extensor carpi radialis brevis

Question 2

muscules in superficial posterior layer (3)

Answer 2

• extensor digitorum
• Extensor digiti minimi
• extensor carpi ulnaris

Question 3

Muscues in deep extensor layer (5)

Answer 3

• supinator
• abd pollicis longus
• extensor pollicis brevis
• ext pollicis longus
• extensor indices

Question 4

floor of the anatomical stuff box (4)

Answer 4

• scaphoid
• trapezium
• ECRL tendon
• ECRB tendon

Question 5

what muscle is the most prox for a deep radial n entrapment

Answer 5

deep radial n

Question 6

what makes up extensor expansion

Answer 6

3 bands-> one central and 2 collateral connected by circular fibres called the hood

Question 7

what can rupture the extensor expansion

Answer 7

hyperfexion of distal interphalangeal J

Question 8

med and lat borders of anatomical stuff box

Answer 8

lat= Abductor pollicis longus + extensor pollicis brevis tendons

Med=extensor pollicis longus tendon

Question 9

roof of anatomical snuff box (3)

Answer 9

superficial fascia
skin
superficial radial n branches

Question 10

Contents of anatomical snuff box

Answer 10

Radial a +v

Question 11

tendons of extensor expansion lat to med (6)

Answer 11

1- abd pollicis br + ext pollicis brev

2. Ext carpi radialis longus + brevis
3. ext pollicis longus
4. ext digitorum + ext indicis
5. ext digiti minimi
6. ext carpi ulnaris

Question 12

path of radial n and its two terminal br

Answer 12

radial n runs in radial groove into the ant arm into the cubital fossa, ant to lat epicondyle and split into deep and superfical radial

Question 13

where does the superfical radial n run and what does it supply

Answer 13

• runs bw brachioradialis and ECRL on lat forearm

- supplies skin over snuffbox and distal pollex

Question 14

when does the deep radial n change names to post interosseus n

Answer 14

after it emerges from distal 1/3 of supinator

Question 15

the deep radial n will innervate what muscles before changing names to post interosseus (5)

Answer 15

ECRB
Supinator
ECU
Ext digitorum
Ext dig min

Question 16

main branch of radial n innervates (2)

Answer 16

brachiradialis

ECRL

Question 17

what does the superficial radial n supply is dorsal hand

Answer 17

lat 3.5 fingers

Question 18

what does the dorsal branch of ulnar n supply

Answer 18

med 1.5 fingers

Question 19

3 areas radial n can be injured

Answer 19

Axilla
Radial groove
Supinator

Question 20

What is the cause of a axilla injury and sensory and motor impaiments

Answer 20

-from crutches, lymph nodes

weakness of ext of arm, forearm, hand, fingers (wrsit drop)
Parasthesia at post aspect of arm, forearm, dorsum, lat 3.5 fingers

Question 21

what is cause of radial groove injury and what are the deficits

Answer 21

fracture of humerus, arm rested on sharp chair

long head of tri and post cuteneous are spared

Question 22

what is cause of supinator m injury and what are the deficits

Answer 22

-Entrapment neuropathy, muscle hypertension

no sensory
-extensors of forearm, digits involved
ECRL, brachioradialis and brachialis spared

Question 23

mallet/baseball finger mech and result

Answer 23

mech- servere tension on ext tendons since distal interphalangeal j are forced into extreme flexion

result- extensior expansion is ruptured and distal phalanx is stuck flexed

Question 24

what is a synovial cyst of the wrist and what is it commonly attached to

Answer 24

non tender cystic swelling on dorsum of hand commonly attached to ECRB and ECRL

Question 25

where can the radial n be impinged to cause wrist drop

Answer 25

1. fracture of humeral shaft

2. entrapment by supinator