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Just name the muscles of ant and post compartment of forearm and also divide them superficail and deep

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forearm muscles anterior posterior compartment diagram superficial deep

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Here is the complete, textbook-verified breakdown of the forearm compartment muscles, sourced from Gray's Anatomy for Students and Imaging Anatomy: Bones, Joints, Vessels and Nerves.

Muscles of the Forearm

ANTERIOR (Flexor/Pronator) Compartment

All muscles here flex the wrist/digits or pronate the forearm. The compartment is divided into three layers:

Superficial Layer (5 muscles - from lateral to medial)

  1. Pronator teres
  2. Flexor carpi radialis (FCR)
  3. Palmaris longus (absent in ~15% of people)
  4. Flexor digitorum superficialis (FDS) - sometimes placed as an intermediate/3rd layer
  5. Flexor carpi ulnaris (FCU)
Note: FDS is often described as an intermediate layer on its own, since it lies deep to the other four superficial muscles but superficial to the deep group.

Deep Layer (3 muscles)

  1. Flexor digitorum profundus (FDP)
  2. Flexor pollicis longus (FPL)
  3. Pronator quadratus

POSTERIOR (Extensor) Compartment

All muscles here are innervated by the radial nerve or its deep branch (posterior interosseous nerve).

Superficial Layer (7 muscles)

  1. Brachioradialis
  2. Extensor carpi radialis longus (ECRL)
  3. Extensor carpi radialis brevis (ECRB)
  4. Extensor digitorum (ED)
  5. Extensor digiti minimi (EDM)
  6. Extensor carpi ulnaris (ECU)
  7. Anconeus

Deep Layer (5 muscles)

  1. Supinator
  2. Abductor pollicis longus (APL)
  3. Extensor pollicis brevis (EPB)
  4. Extensor pollicis longus (EPL)
  5. Extensor indicis (EI)
APL, EPB, and EPL are the "outcropping muscles" - they emerge between the superficial extensor tendons and form the anatomical snuffbox boundaries.
Diagrams from Gray's Anatomy for Students:
Forearm cross-section showing anterior and posterior compartments:
Forearm compartments cross-section
Superficial layer of the posterior compartment:
Posterior superficial muscles
Deep layer of the posterior compartment:
Posterior deep muscles
Quick memory aids:
  • Anterior superficial = "PT, FCR, PL, FDS, FCU" (5 muscles, medial epicondyle origin for most)
  • Anterior deep = "FDP, FPL, PQ" (3 muscles, bone/membrane origin)
  • Posterior superficial = "Br, ECRL, ECRB, ED, EDM, ECU, An" (7 muscles)
  • Posterior deep = "SAAPE" - Supinator, APL, APB... or just "Supinator + 4 thumb/index muscles"
  • Gray's Anatomy for Students, forearm section (block 4, p. 892-910)
  • Imaging Anatomy Vol. 3, Volar Compartment section (block 1, p. 116-117)
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