The palmar interossei are three small muscles in the hand that lies between the metacarpal bones and are attached to the ring, index, and little fingers.
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Attachment of the Palmar Interosseous Muscles
Origin: Palmar 1 – 3: Palmar surfaces of 2nd, 4th, and 5th metacarpals
Insertion: Palmar 1 – 3: Extensor expansions of digits and bases of proximal phalanges of digits 2, 4 and 5
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Nerve Supply of the Palmar Interosseous Muscles
Innervated by the deep branch of the ulnar nerve.
Blood supply of the Palmar Interosseous Muscles
Supplied by the palmar metacarpal artery of the deep palmar arch.
Function of the Palmar Interosseous Muscles
The palmar interosseous muscles adduct the fingers towards the middle finger. In addition, they flex the finger at the metacarpo-phalangeal joint and extend the finger at the interphalangeal joint and thus assist the lumbricals.
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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