Anterior and Posterior Forearm Flashcards
Superficial layer of the Anterior Forearm Compartment
Palmaris Longus, Flexor Carpi Ulnaris, Flexor Carpi Radialis, and Pronator Teres
What is the Intermediate Layer (layer 2) of the Anterior Forearm?
Flexor Digitorum Superficialis
What is the Deep layer(Layer 3&4) of the anterior forearm?
Flexor Pollicis Longus(3), Flexor Digitorum Profundus(3), Pronator Quadratus (4)
The Majority of the anterior compartment is innervated by which nerve
Median
Which muscles of the anterior compartment are not innervated by the median?
Flexor Carpi Ulnaris and the Ulnar part of flexor digitorum profundus which are both innervated by the ulnar nerve
What is the insertion of the FCR?
Base of 2nd and 3rd Metacarpals
`What is the insertion of the FCU?
Pisiform, Hook of Hammate and 5th Metacarpal
Which muscle is sometimes missing in the forearm?
Palmaris Longus
Flexor Digitorus Superficialis
O: Common Flexor
I: Middle Phalanx of 2-5 Digits
Inn: Median
Flexor Pollicis Longus
O: Anterior Radius
I: DIP of Thumb
Describe the insertions of the FDS and FDP
The FDS splits to allow the FDP to run through its middle and insert on the distal phalanx
What 2 neurovascular structures run together under the FDS?
Median nerve and Ulnar Artery
Where is the common extensor origin?
Lateral Epi + Lateral Supracondylar ridge
What nerve innervates the posterior compartment of the forearm?
Radial
What are the deep muscles of the posterior forearm?
EPB, EPL, APL, Extensor Indicis, Supinator
Pollicis indicates soup
What are the Superficial muscles of the post. forearm?
ECRL, ECRB, ECU, E Digitorum, E Digiti Minimi, Brachioradialis
What are the 3 wrist extensors and where do they insert?
ECRL, ECRB, ECU - base of metacarpals 2,3 & 5
Why is it impossible to extend each digit independently?
Because of the intertendinous connection (ligament) that connects the extensor tendons
What are the 3 outcropping muscles?
The pollicis muscles
APL, EPL, EPB
Insertions of the outcropping muscles
APL - base of 1st meta
EPL - Base of distal phalanx
EPB - Base of proximal phalax
What tendons frame the snuff box?
EPL and EPB
The lateral cutaneous nerve is a continuation of which nerve?
Musc
