Posterior Forearm Flashcards
What are the attachments of the extensor carpi radialis longus muscle? ECRL
from the lateral epicondyle of the humerus to the base of the 2nd metacarpal.
What are the attachments of the extensor carpi radialis brevis muscle? ECRB
From the lateral supracondylar ridge of the humerus to the base of the 3rd metacarpal
What are the attachments of the extensor carpi ulnaris muscle? ECU
From the later epicondyle of the humerus to the base of the 5th metacarpal
What are the attachments of the extensor digitorium msucle?
from the lateral epicondyle of the humerus to the extensor expansions of digits 2-5
What are the attachments of the extensor digit minimi muscle? EDM
from the lateral epicondyle of the humerus to the digital expansion of the 5th digit
What are the attachments of the brachioradialis?
from the lateral supracondylar ridge of the humerus to the distal radius lateral to the styloid process
What are the superficial muscles of the posterior forearm?
Brachioradialis, Extensor carpi radialis longus, Extensor carpi radialis brevis, Extensor carpi ulnaris, Extensor digitorum, and Extensori digiti minimi
What is the common extensor origin?
The lateral epicondyle of the humerus
What are the actions of the brachioradialis muscle?
flexes the elbow
What are the actions of the extensor carpi radialis longus muscle?
extends and abducts hand at wrist (radial deviation) & assists in flexion of the elbow
What are the actions of the extensor carpi radialis brevis muscle?
extends and abducts hand at wrist (radial deviation)
What are the actions of the extensor carpi ulnaris muscle?
extends and adducts hand at wrist (ulnar deviation)
What are the actions of the extensor digitorum muscle?
extends phalanges (primarily at metacarpophalangeal, secondarily at interphalangeal)
extends hand at wrist
What are the actions of the extensor digiti minimi muscle?
Extends 5th digit @ metacarpophalangeal and interphalangeal
What are the innervations of the brachioradialis muscle?
radial nerve (C5-C6)
What are the innervations of the extensor carpi radialis longus muscle?
radial nerve (C6-C8)
What are the innervations of the extensor carpi radialis brevis muscle?
radial nerve (C6-C8)
What are the innervations of the extensor digitorum muscle?
radial nerve (C6-C8)
What are the innervations of the extensor digiti minimi muscle?
radial nerve (C7-C8)
What are the innervations of extensor carpi ulnaris muscle?
radial nerve (C6-C8)
What are the deep muscles of the posterior forearm?
Supinator and Extensor Indicis
What are the attachments of the supinator muscle?
from the lateral epicondyle of the humerus, radial collateral ligament & supinator crest of the ulna to the lateral surface of the proximal radius
What are the attachments of the extensor indicis muscle?
from the posterior surface of the ulna & interosseous membrane to the digital expansion of the 2nd digit
what are the actions of the supinator muscle?
supinates forearm
What are the actions of the extensor indicis muscle?
extends 2nd digit @ metacarpophalangeal and interphalangeal
What are the innervations of the supinator muscle?
radial nerve
What are the innervations of the extensor indicis muscle?
radial nerve
What are the outcropping thumb muscles of the posterior forearm?
Abductor pollicis longus, extensor pollicis brevis, and extensor pollicis longus
What are the attachments of the abductor pollicis longus?
from the proximal posterior radius, ulna & interosseous membrane for the base of the 1st metacarpal & trapezium
What are the attachments of the extensor pollicis longus?
from the middle 1/3 of the posterior surface of the ulna & interosseous membrane to the base of the 1st distal phalanx
What are the attachments of the extensor pollicis brevis?
from the posterior radial surface of the ulna & interosseous membrane to the base of the 1st distal phalanx
What are the actions of the abductor pollicis longus?
abducts & extends thumn at carpometacarpal joint
& abducts hand at wrist (radial deviation)
What are the actions of the extensor pollicis longus?
extends thumb @ CMC, metacarpophalangeal & interpahalngeal joints
What are the actions of the extensor pollicis brevis?
extends thumb @ metacarpophalangeal
& extends and abducts CMC joint
What are the innervations of the abductor pollicis longus?
radial nerve
What are the innervations of the extensor pollicis longus?
radial nereve
What are the innervations of the extensor pollicis brevis?
radial nerve
What is the name of the thick, deep fascia extension of the antebrachial fascia?
Extensor retinaculum
What are the contents of the extensor retinaculum?
6 muscles’ tendons pass deep to the fascia
- EPB and APL
- EPR longus & brevis
- EPL
- Tendon sheath for extensor digitorum & extensor indicis
- Extensor digit minimi
- Extensor carpi ulnaris
What are the general actions of the extensor retinaculum?
Directs tendons in a precise way for precis movements
The skin of the posterior medial forearm is associated with which dermatome?
T1
The skin of the axillary region is associated with which dermatome?
T2
The dermatome of the axillary region is associated with which spinal nerve?
T2
The dermatome of the proximal half of the posterior and anterior medial arm is associated with which spinal nerve?
T2
The dermatome of the anterior and posterior medial forearm and the skin of the distal half of the medial arm is associated with which spinal nerve?
T1
The dermatome of the shoulder is associated with which spinal nerve?
C4
The dermatome of the digits 4,5 is associated with which spinal nerve?
C8
The dermatome of digits 2-4 is associated with which spinal nerve?
C7
Primarily index finger
The dermatome of the thumb is associated with which spinal nerve?
C6
The dermatome of the lateral arm and forearm are associated with which spinal nerve?
C5
