Content
Introduction 0:00
Division of the Hand Muscles 0:21
Thenar Muscles 0:51
Hypothenar Muscles 2:50
Middle Hand Muscles 4:33


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Muscles of the hand
Muscles of Thenar Eminence
Muscles of Hypothenar Eminence
Middle Hand Muscles
○ Interossei muscles
○ Lumbrical muscles

Thenar Muscles
Abductor Pollicis Brevis
Opponens Pollicis
Flexor Pollicis Brevis
Adductor Pollicis

Opponens Pollicis
musculus opponens pollicis
O: Flexor retinaculum and trapezium
I: Base of 1st metacarpal bone
basis ossis metacarpalis I
F: Opposition and flexion of thumb

Flexor Pollicis Brevis
musculus flexor pollicis brevis
O:
Flexor retinaculum
Deeper part: Trapezium, trapezoideum
I: Base of Proximal Phalanx of the thumb
basis phalangis proximalis pollicis
F: Opposition + Flexion of the thumb

Adductor Pollicis
musculus adductor pollicis
O:
Oblique head: Capitate + base of 2/3rd metacarpal
Transverse head: 3rd metacarpal
I: Base of Proximal Phalanx of the thumb
basis phalangis proximalis pollicis
F: Adduction of the thumb

Abductor Pollicis Brevis
musculus abductor pollicis brevis
O: Flexor retinaculum
I: Base of proximal phalanx of thumb
basis phalangis proximalis pollicis
F: Abduction of thumb

Hypothenar Muscles
Opponens digiti minimi
musculus opponens digiti minimi
O: Flexor retinaculum + Hamatum
I: 5th metacarpal bone
Os metacarpale V
F: Opposition of little finger

Flexor Digiti Minimi Brevis
musculus flexor digiti minimi brevis
O: Flexor retinaculum + Hamatum
I: Base of Proximal Phalanx of Little Finger
basis phalangis proximalis digiti minimi
F: Flexion of little finger


Abductor Digiti Minimi
musculus abductor digiti minimi
O: Flexor retinaculum + Pisiform
I: Base of Proximal Phalanx of Little Finger
basis phalangis proximalis digiti minimi
F: Abduction of little finger

Palmaris Brevis
musculus palmaris brevis
O: Flexor retinaculum + Palmar Aponeurosis
I: Skin of the palm on the ulnar side
F:
Pulls the skin and produces
wrinkles on the hypothernal side

Middle Hand Muscles
Palmar Interossei
Musculi interossei palmares
Three muscles located in the 2nd4th interosseous
space between the metacarpals
O:
2nd metacarpal – Medial side
4th metacarpal – Lateral side
5th metacarpal – Lateral side
I: Proximal Phalanx of 2nd, 4th and 5th finger
F:
Adduction of fingers:
Pulls 2nd, 4th and 5th fingers to 3rd finger

Dorsal Interossei
Musculi interossei dorsales
Four muscles located in the 1st4th interosseous
space between the metacarpals
O:
Between the metacarpal bones of 1st to 5th fingers
I: Proximal Phalanx of 2nd4th fingers
F:
Abduction of fingers:
Pulls 2nd, 4th fingers away from 3rd finger

Lumbricals
Musculi lumbricales
Four muscles corresponding to the 2nd5th digits
O:
Tendons of the flexor digitorum profundus
I: Proximal Phalanx of 2nd5th fingers
F:
Flexion of proximal phalanges
Extension of middle and distal phalanges