Page 229 - Ultimate Visual Dictionary (DK)

MUSCLES 1
MOVEMENT OF THE FOREARM
Controlled movement of the limbs relies
BACK VIEW on coordinated relaxation and contraction
Extensors Flexors of opposing muscles. To raise the forearm,
of hand of hand the biceps (two-rooted muscle) contracts
and shortens while the triceps (three-
rooted muscle) relaxes; the reverse
occurs when the forearm is lowered.

Temporalis
Triceps in
Triceps resting phase
brachii
Sternocleidomastoid Biceps in
resting phase
Teres minor
Forearm
Trapezius Teres major at rest
Infraspinatus

Rhomboideus major
Deltoid
Latissimus dorsi Triceps
relaxes
Forearm
Biceps half raised
contracts

Triceps fully
Gluteus relaxed
maximus
Biceps fully
contracted
Adductor Forearm
magnus fully raised
Gracilis
Biceps femoris
Semitendinosus Triceps
contracts
Forearm
Biceps half lowered
relaxes

Gastrocnemius
Triceps back in
Soleus resting phase
Biceps back in
Peroneus resting phase Forearm
brevis back at rest

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