median nerve:-motor innervation.

Motor innervation

The nerve innervates most of the flexor muscles of the forearm with the exception of the flexor carpi ulnaris and the medial two digits of the flexor digitorum profundus, which are supplied by the ulnar nerve

Unbranched, the median nerve supplies the following muscles:

• Pronator teres
• Flexor carpi radialis
• Palmaris longus
• Flexor digitorum superficialis

The anterior interosseus branch supplies the following muscles:

• Lateral (radial) half of the Flexor digitorum profundus
• Flexor pollicis longus
• Pronator quadratus

In the hand, the median nerve provides innervation to:

• 1st and 2nd lumbricals
• Thenar muscles: Abductor pollicis brevis, Flexor pollicis brevis, Opponens pollicis

Contributing spinal nerve roots

C5, C6, C7, C8, T1

sesamoid bones :-

Sesamoid bones are small more or less rounded masses embedded in certain tendons and usually related to joint surfaces. Their functions probably are to modify pressure, to diminish friction, and occasionally to alter the direction of a muscle pull.
They are not covered by periosteum & begin to ossify after birth & are partly ossified.
They may be articular or non-articular.
In the lower extremity the largest sesamoid bone of the joints is the patella, developed in the tendon of the Quadriceps femoris.