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Brachialis: Origin, Insertion, Nerve Supply & Action

Brachialis: The brachialis is a muscle in the upper arm that flexes elbow joint. It lies deeper in the biceps brachii and a synergist action that assists the biceps brachii in flexing at the elbow. The brachialis muscle forms the floor of the cubital fossa. The brachialis muscle is the prime mover of elbow flexion.

Attachments of the brachialis muscle

Origin: Originates from the medial and lateral surfaces of the humeral shaft
Insertion: Inserts into the ulnar tuberosity, just distal to the elbow joint

Brachialis

Actions of the brachialis muscle
Flexion at the elbow joint

Nerve supply  of the brachialis muscle
Musculocutaneous nerve, with contributions from the radial nerve

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Arm Muscle: Origin, Insertion, Nerve supply & Action

Upper Extremity Muscle Atlas

  • Abductor Pollicis Longus
  • Abductor Digiti Minimi
  • Abductor Pollicis Brevis
  • Adductor Pollicis
  • Anconeus
  • Biceps Brachii
  • Brachioradialis
  • Brachialis
  • Coracobrachialis
  • Deltoid
  • Extensor Carpi Radialis Longus
  • Extensor Carpi Radialis Brevis
  • Extensor Carpi Ulnaris
  • Extensor Digitorum
  • Extensor Digiti Minimi
  • Extensor Indicis
  • Extensor Pollicis Longus
  • Extensor Pollicis Brevis
  • Flexor Carpi Radialis
  • Flexor Carpi Ulnaris
  • Flexor Digitorum Profundus
  • Flexor Digitorum Superficialis
  • Flexor Digiti Minimi Brevis
  • Flexor Pollicis Brevis
  • Flexor Pollicis Longus
  • Infraspinatus
  • Interosseous Muscles, Dorsal
  • Interosseous Muscles, Palmar
  • Levator Scapulae
  • Latissimus Dorsi
  • Opponens Digiti Minimi
  • Opponens Pollicis
  • Pectoralis Major
  • Pectoralis Minor
  • Palmaris Longus
  • Pronator Quadratus
  • Pronator Teres
  • Rhomboid Major and Minor
  • Subscapularis
  • Supinator
  • Serratus Anterior
  • Supraspinatus
  • Trapezius
  • Triceps Brachii
  • Teres Major
  • Teres Minor
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