Download Lecture Forearm

FOREARM (ANTEBRACHIUM)
Fascial compartments
Interosseous membrane
Compartment syndrome
Flexor Forearm - Generalizations
-Attachment: medial epicondyle of Humerus
-Innervation: Median n. (except 1.5 muscles-Ulnar n.)
-Function: Flexion
* KNOW DISTAL ATTACHMENTS….!
Flexor Forearm - Superficial
PT: Pronator Teres
FCR: Flexor Carpi Radialis
PL: Palmaris Longus
FCU: Flexor Carpi Ulnaris
BR*: Brachioradialis
Flexor Forearm - Intermediate
FDS: Flexor Digitalum
superficialis-flexes digits
2,3,4,5…tendon biforcates.
Innervated by median n.
Attachment at radius and
lateral epicondyle of
Humerus.
Flexor Forearm - Deep
FDP: Flexor Digitorum
Profundus-attaches to
base of distal phalanges
2,3,4,5-flexes digits, helps
flex wrist-muscle has 2
halves…the tendons going
to digits 4 & 5 ulnar nerve
& those going to digits 2 &3
innervated by median n.
FPL: Flexus Pollicis
Longus (pollex=thumb)from radius to distal
phalynx, thumb. (looks like
a feather)
PQ: Pronator Quatratusattaches distal ulna to
distal radius
Lumbrical muscles...big red (4
of them)
The Carpal Tunnel
Flexor retinaculum (AKA: transverse carpal ligament)
Attaches to pisaform, trapesium, scaphoid, ….
What 10 things pass through? Median n., FDS tendon
(4), FDP tendons (4), Flexor Pollicis Longus (feather)
Extensor Forearm – Generalizations
-Attachment: lateral epicondyle
-Innervation: radial n.
-Function: extension
Extensor Forearm - Superficial
ECRL: extensor carpi
radialis longus
ECRB: extensor carpi
radialis brevis
ED: extensor digitorum
EDM: extensor digiti
minimi
ECU: extensor carpi
minimi
Extensor Forearm - Deep
APL: Abductor Pollicis
Longus
EPB: Extensor Pollicis
Brevis (brevis=short) (stops
at proximal phalanx)
EPL: Extensor Pollicis
Longus (attaches to distal
phalanx)
EI: Extensor
Indicis…extends the Index
finger
Supinator: supinates the
forearm
Anconeus*: purple, wraps
around, allows supination
Anatomical Snuff Box
Contents: Radial A. &
Scaphoid Bone
Extensor Retinaculum
Extensor Expansion (Hood)-sheathLike tendon that is like a sheath on
Digits 2-5 crossing whole posterior
phalanx
Forearm – Vessels/Nerves
Forearm – Vessels/Nerves
PROBLEM SPOTS FOR NERVES:
Median N. – b/w 2 heads pronator teres m. (up
At the elbow where it enters the elbow) At medial
Epicondyle
Ulnar N. – b/w 2 heads of FCU
Radial N. (deep) – through supinator muscle, exTends up lateral epicondyle.