Nervous system spinal nerves

Nervous system spinal nerves
Nervous system: spinal nerves: whitish cords transmitting outgoing signals, from the brain to the organs.
Cervical nerves (innervate the neck and the arms): cords conducting nerve impulses from the neck and arms to the cerebellum via the spinal cord.
Intercostal nerve: cord conducting nerve impulses between the ribs.
Lumbar and sacral nerves (innervate the legs and pelvic organs): nerves originating in the lower back and extending into the pelvis and legs.
Sacral plexus: network of nerves of the sacrum.
Lumbar plexus: network of nerves of the lower back.
Spinal cord: substance belonging to the nervous system, found in the holes of the vertebrae.
Brachial plexus: network of nerves of the arm.
Cerebrum: seat of the mental capacities.

Photo :

EN : Human skin
FR : Peau humaine
ES : Piel humana

Human 
          skin

Humain skin is the largest organ of the integumentary system made up of multiple layers of epithelial tissues that guard underlying muscles and organs. As the interface with the surroundings, skin plays the most important role in protecting.