How many muscles to write?

Answer 1

There are around 25 muscles that are used in writing.

Intrinsic hand muscles act only the digits:

THENAR MUSCLES and ADDUCTOR POLLICIS

HYPOTHENAR MUSCLES

LUMBRICALES

DORSAL INTEROSSEI

PALMAR INTEROSSEI

Extrinsic thumb muscles that act on the thumb:

FLEXOR POLLICIS LONGUS

EXTENSOR POLLICIS LONGUS

EXTENSOR POLLICIS BREVIS

ABDUCTOR POLLICIS LONGUS

Extrinsic hand muscles act on the wrist and the digits:

EXTENSOR DIGITORUM

EXTENSOR INDICIS (PROPRIUS)

EXTENSOR DIGITI MINIMI (PROPRIUS)

FLEXOR DIGITORUM SUPERFICIALIS

FLEXOR DIGITORUM PROFUNDUS

Carpal muscles act at the wrist and, in some cases, the elbow:

EXTENSOR CARPI RADIALIS LONGUS

EXTENSOR CARPI RADIALIS BREVIS

EXTENSOR CARPI ULNARIS

FLEXOR CARPI RADIALIS

FLEXOR CARPI ULNARIS

PALMARIS LONGUS

Answer 2

Skeletal (striated) muscles of the fingers, hands and forearm.

Answer 3

There are 700 muscles in the human body. Of these 700, 20 muscles are used when writing and 43 are used when frowning.

Answer 4

43 muscles