NOT a hybrid muscle among the following is
Nerve supply of above muscles-
Brachialis

Musculocutaneous Nerve and Radial nerve (proprioception)

Flexor pollicis brevis

Superficial head by Median Nerve
Deep head by Ulnar nerve

Sternocleidomastoid

Spinal accessory nerve and C3 , C4

Adductor pollicis

Ulnar nerve
Brachialis
Flexor pollicis brevis
Sternocleidomastoid
Adductor pollicis