Posterior Compartment/EXtENsors Forearm Flashcards
A. All mucles in the Posterior Forearm are innervated by the ____ _____
B. DESCRIBE the extent of this nerve and its branches in the POST-forearm
1. Radial n. proper
- DEEP Branch Radial n. [3]
A. All POST-forearm muscles are innervated by the RADIAL nerve & its branches
B:
1. Radial n. proper innervates [extensor carpi radials longus] and then SPLITS into superficial cutaneous & DEEP branches
- DEEP Branch Radial n. innervates [extensor carpi radials brevis] & supinator–>then it pierces supinator to become [POST interosseus nerve]–>which innervates all other extensors
What muscles rotates radius on the ulna (supines forearm)
SUPINATOR
What muscles EXTEND the HAND @ the wrist and where do they insert? [3]
C: in which direction do each of these muscles actually move the hand? [2 each]
D: Are these muscles Superficial, Deep or BOTH?
E: What nerve innervates these muscles?
1: Extensor carpi radials longus- ABducts & Extends
2:Extensor carpi radials brevis- ABducts & Extends
[lateral away from body] & Extends
- Extensor carpi Ulnaris- ADDucts & Extends
[medial mvmnt BACK TOWARD BODY] & Extends
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B: = –>Carpi Longus inserts 2nd metacarpal / carpi brevis: 3rd metacarpal / Ulnaris EXT: 5th metacarpal
——————————————————————————-
D: THESE ARE ALL SUPERFICIAL
“Superficial Extensors [Bring Cats Directly 2 cdU]”
E: Radial n.
A. What muscles extend wrist & DIGITS? [3]
B. Which digits do they extend each?
C. Where do they insert?
< “Did” extends the DIGITS! >
A.
1-extensor digitorum = digits 2-5
2-extensor indicis = just digit #2
3. extensor digiti minimi= just digit #5
C. inserts into extensor expansions=aponeuroses formed on each digit by extensor and intrinsic muscle tendons
A: Which muscles EXTEND the thumb [3]
B: Where exactly does each extend it
C: Where do they insert?
A:
1-ABductor pollicis longus=extends & ABducts thumb
2-extensor Pollicis brevis=extends Thumb PP(Proximal Phalanx)
C: All insert onto bases of 1st metacarpal, PP and DP
- Name the muscle that can only “weakly” flex the forearm when pronated :-O… why is this?
- What is this muscles main job?
- What nerve innervates this muscle?
- What is its perfusion artery?
- BRACHIORADIALIS becuz it attaches to
[ humerus supracondylar ridge] & radius - Flexion of the Elbow & Forearm Supination/Pronation
- RADIAL n.
- Radial recurrent artery
What are the Superficial layers of the POST-FOREARM EXTENSOR group [6]
“Superficial Extensors [Bring Cats Directly (2) cdU] “
B=Brachioradialis
C=Carpi radialis LONGUS
D=Digitorum
c=carpi radialis brevis
d=digiti minimi
U=Ulnaris (carpi Ulnaris)
What are the DEEP layers of the POST-FOREARM Extensor Group [6]
“DEEP Extensors are usually needed [ASAp Pi] ! “
A=Anconeus
S=Supinator
A=ABductor pollicis LONGUS
p= pollicis brevis
P=POLLICIS LONGUS
i= indicis
A: What 3 Extensor tendons form the Anatomical snuff box?
B: Which artery is found within this snuff box? Which nerve is found ON TOP this snuff box?
A: Snuff box=
[EX ABdcutor pollicis Longus],
superior = [EX Pollicis Longus tendon]
inferior= [EX Pollicis brevis tendon] inferiorly
B: RADIAL artery is INSIDE snuff boxy while superficial branch Radial n. is ON TOP of snuff box
What nerve is known as the “million dollar” nerve?
The [Median n. recurrent thenar branch]
- Deep Palmar Fascia is thin in the ____ but THICK in the ______ where it forms the Palmar Aponeurosis
- What exactly is the Palmar aponeurosis?
- Deep Palmar Fascia is thin over the thenar/hypothenar eminences but THICK in the palm where it forms Palmar Aponeurosis
- PA= Dense strong well-defined triangular layer of deep fascia located in middle palm
Anconeus
- Location
- Function
- nerve innervation
Anconeus=tiny Superficial Extensor muscle located behind elbow under EX. Digitorum & Ulnaris
- Extends forearm
- All Post-axial forearm muscles = RADIAL n. innervation
