Nerves Flashcards
1
Q
Common Fibular
A

2
Q
Lower Extremity Femoral
A

3
Q
Lower Extremity Obturator
A

4
Q
Lower Extremity Tibial
A

5
Q
Upper Extremity Median
A

6
Q
Upper Extremity Musculocutaneous
(pic)
A

7
Q
Upper Extremity Radial and Axillary
A

8
Q
Upper Extremity Ulnar
A

9
Q
Lower Extremity Myotomes
A

10
Q
Upper Extremity Myotomes
A

11
Q
Upper extremity musculocutaneous
A
- lateral cord, opposite the lower border of the pectoralis major - C5, C6, C7 (coracobrachialis, biceps brachii, brachialis)
- branch to coracobrachialis given off close to its origin
- penetrates coracobrachialis, innervates biceps brachii and brachialis; passes obliquely b/t biceps & brachialis, to the lateral side of the arm
- just above elbow, pierces the deep fascia lateral to the tendon of the biceps brachii, continues in forearm as lateral cutaneous nerve of the forearm.
*
12
Q
Upper extremity radial nerve (description)
A
- posterior cord (C5-T1) through triangular space (teres major - sup, biceps LH - med, humerus - lat) with deep artery
- posterior compartment of the arm
- medial triceps, spiral groove, lateral triceps
- Post cutaneous nerve of arm (originates in axilla)
- Inf lateral cutaneous nerve of arm (originates in arm)
- Post cutaneous nerve of forearm (originates in arm)
- anterior compartment of the arm,b/t brachialis & brachioradialis mm
- aconeus, brachioradialis, ECRL
- posterior compartment of the forearm
- superficial - sensory only
- deep branch - ECRB, supinator
- PIN (after supinator) (7 total; 6xEXT, 3xpollicis)
- Extensor digitorum, extensor indicis, extensor digiti minimi
- Extensor carpi ulnaris
- Extensor pollicis brevis
- Extensor pollicis longus
- Abductor pollicis longus
13
Q
Upper extremity median nerve (description)
A
- lateral (C5-C7) and medial cords (C8-T1);inferior to teres major; with the brachial artery & in cubital fossa; through 2 heads of pronator teres
- b/t FDS & FDP then FDS & FPL;
- as AIN innervates all flexor muscles (7) except FCU & 1/2 FDP (ulnar)
- superficial
- Pronator teres
- flexor carpi radialis
- palmaris longus
- Intermediate
- FDS
- Deep
- FDP (lat 1/2)
- FDL
- pronator quadratus
- superficial
- through carpal tunnel, into hand LOAF
- 1st & 2nd lumbricals
- opponens pollicis
- ABD-ductor pollicis brevis
- flexor pollics brevis
14
Q
Median nerve injury
A
- AIN syndrome
- Motor deficit: pronator teres, FDP (lat 1/2)
- Sensory deficit: None
- Carpal tunnel
- Motor deficit: FDP (lat 1/2); loss of abduction and opposition of thumb.
- ape hand deformity (hand is at rest) with hyperext of index D1,D2; D1 ADD
- benediction sign (attempt fist) due to weakness in flexion of radial half of digits.
- Sensory deficit: lateral 3 1⁄2 digits including their nail beds, (NOT carpal if sensation lost in thenar area b/c palmar cutaneous branch)
- Motor deficit: FDP (lat 1/2); loss of abduction and opposition of thumb.
15
Q
Radial nerve injury
A
- Above elbow
- elbow extension
- wrist drop
- Below elbow
- wrist drop
16
Q
Upper extremity axillary nerve (description)
A
- upper trunk, posterior division, posterior cord (C5-C6); thru quadrangular space (Sup: teres minor, Inf:teres major; Med: LH biceps; Lat: humerus)
- Sensory:
- shoulder patch by superior lateral cut nerve of arm
- Motor:
- deltoid, teres minor, long head of triceps
17
Q
Upper extremity ulnar nerve (description)
A
- Medial cord (C8-T1)
- posteromedial aspect of the humerus, behind medial epicondyle
- anterior forearm with ulnar artery
- motor: FCU, 1/2 FDP (med)
- sensory: palmar & dorsal branch:
- through guyon canal into hand (deep branch)
- Opponens DM, ABD DM & flexor digiti minimi brevis
- 3&4 lumbrical
- PAD & DAB
- adductor pollicis
- FPB (deep)
- NOT through guyon via superficial branch: palmaris brevis
18
Q
Ulnar nerve injury
A
Guyon canal:
- Motor deficit:
- Weakness in flexion of the hand at the wrist, loss of flexion of D4-D5; cannot “cross” digits
- claw hand (hand at rest) b/c hyperEXT of D4-D5 @ MCP + FLEX @ IP; worse if lesion @ wrist
- Froment’s (thumb ADD)
- Sensory deficit: ulnar half of palm, medial 1½ digits (palmar & dorsal) –> DORSAL HAND AFFECTED ONLY if lesion is at elbow
19
Q
Axillary nerve injury
A
shoulder dislocation
- Sensory:
- shoulder patch by superior lateral cut nerve of arm
- Motor:
- deltoid, teres minor, long head of triceps
20
Q
A