Muscles of Arm and Hand

Muscles of Arm and Hand are specifically formed for performing complex tasks like writing, weightlifting etc. They increase in their size considerably (Hypertrophy) when used regularly, and become more efficient and powerful. However when not used much they decrease in size and strength (Atrophy).

Anterior | Posterior

Deltoid Muscle Biceps Brachii Brachioradialis Muscle Palmaris Longus Muscle Extensor Carpi Radialis Longus Muscle Extensor Retinaculum Dorsal Interossei Muscle Extensor Carpi Ulnaris Muscle Extensor Digitorum Communis Muscle Extensor Carpi Radialis Brevis Muscle Brachioradialis Muscle Biceps Brachii Muscle Posterior Brachialis Muscle Triceps Brachii Muscle

Muscles of Arm and Hand

STRUCTURE :

Muscles of the Arm are divided into anterior and posterior compartments by a Fascial Membrane. Muscles of the Anterior Compartment are :

Biceps Brachii
Brachialis
Coracobrachialis

Muscles of the Posterior Compartment are :

Triceps Brachii
Anconeus

Muscles of Forearm are divided into Flexor (anterior) and Extensor (posterior) compartment. Each compartment is then further subdivided into Superficial and Deep Layer. Flexor Compartment has following Muscles :

Pronator Teres (superficial)
Palmaris Longus (superficial)
Flexor Carpi Radialis (superficial)
Flexor Carpi Ulnaris (superficial)
Flexor Digitorum Superficialis (superficial)
Pronator Quadratus (deep)
Flexor Digitorum Profundus (deep)
Flexor Pollicis Longus (deep)

Posterior Compartment Muscles of the Forearm are :

Brachioradialis (superficial)
Extensor Carpi Longus (superficial)
Extensor Carpi Bravis (superficial)
Extensor Digitorum (superficial)
Extensor Digiti Minimi (superficial)
Extensor Carpi Ulnaris (superficial)
Supinator (deep)
Abductor Pollicis Longus (deep)
Extensor Pollicis Longus (deep)
Extensor Pollicis Brevis (deep)
Extensor Indicis (deep)

Muscles of the Hand are divided into medial, lateral and intermediate parts. Medial Volar Muscles are :

Opponens Digiti Minimi (hypothenar eminence)
Abductor Digiti Minimi (hypothenar eminence)
Flexor Digiti Minimi Brevis (hypothenar eminence)
Palmaris Brevis

Lateral Volar Muscles are :

Opponens Pollicis (thenar eminence)
Abductor Pollicis Brevis (thenar eminence)
Flexor Pollicis Brevis (thenar eminence)
Adductor Pollicis

Muscles Intermediate to them are :

Lumbrical Muscles
Dorsal Interossei
Palmar Interossei

BLOOD SUPPLY :

Muscles of the arm are supplied by the Axillary and Brachial Artery. Those of the Forearm and Hand are supplied by the two terminal branches of the Brachial Artery i.e. Ulnar Artery and Radial Artery.

NERVE SUPPLY :

Muscles of the Arm and Hand are supplied by the branches from Brachial Plexus.