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 TeresFCR: Flexor Carpi RadialisPL: Palmaris LongusFCU: Flexor Carpi UlnarisBR*: 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 Quatratus-attaches distal ulna to distal radius

Lumbrical muscles...big red (4 of them)

Flexor retinaculum (AKA: transverse carpal ligament)Attaches to pisaform, trapesium, scaphoid, ….What 10 things pass through? Median n., FDS tendons(4), FDP tendons (4), Flexor Pollicis Longus (feather)

The Carpal Tunnel

Extensor Forearm – Generalizations

-Attachment: lateral epicondyle

-Innervation: radial n.

-Function: extension

Extensor Forearm - Superficial

ECRL: extensor carpi radialis longusECRB: extensor carpi radialis brevisED: extensor digitorumEDM: extensor digiti minimiECU: extensor carpi minimi

Extensor Forearm - Deep

APL: Abductor Pollicis LongusEPB: Extensor Pollicis Brevis (brevis=short) (stops at proximal phalanx)EPL: Extensor Pollicis Longus (attaches to distal phalanx)EI: Extensor Indicis…extends the Index fingerSupinator: supinates the forearm Anconeus*: purple, wraps around, allows supination

Anatomical Snuff Box Contents: Radial A. & Scaphoid Bone

Extensor Retinaculum

Extensor Expansion (Hood)-sheath-Like 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. (upAt the elbow where it enters the elbow) At medialEpicondyleUlnar N. – b/w 2 heads of FCURadial N. (deep) – through supinator muscle, ex-Tends up lateral epicondyle.